From f2e2abdbfab54c8f7905d5ea16d4c5d9ce2a49dc Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sat, 21 Dec 2024 09:08:48 +0200 Subject: [PATCH 01/99] Solve 2024 day 21 part 1 --- .../eu/sim642/adventofcode2024/day21.txt | 5 + .../eu/sim642/adventofcode2024/Day21.scala | 95 +++++++++++++++++++ .../sim642/adventofcode2024/Day21Test.scala | 22 +++++ 3 files changed, 122 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2024/day21.txt create mode 100644 src/main/scala/eu/sim642/adventofcode2024/Day21.scala create mode 100644 src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala diff --git a/src/main/resources/eu/sim642/adventofcode2024/day21.txt b/src/main/resources/eu/sim642/adventofcode2024/day21.txt new file mode 100644 index 00000000..45e27e1d --- /dev/null +++ b/src/main/resources/eu/sim642/adventofcode2024/day21.txt @@ -0,0 +1,5 @@ +593A +508A +386A +459A +246A diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day21.scala b/src/main/scala/eu/sim642/adventofcode2024/Day21.scala new file mode 100644 index 00000000..14a1c909 --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcode2024/Day21.scala @@ -0,0 +1,95 @@ +package eu.sim642.adventofcode2024 + +import eu.sim642.adventofcodelib.Grid +import eu.sim642.adventofcodelib.graph.{BFS, GraphSearch, Heuristic, UnitNeighbors} +import eu.sim642.adventofcodelib.pos.Pos +import eu.sim642.adventofcodelib.GridImplicits.* + +object Day21 { + + type Code = String + + private val numericKeypad: Grid[Char] = Vector( + Vector('7', '8', '9'), + Vector('4', '5', '6'), + Vector('1', '2', '3'), + Vector(' ', '0', 'A'), + ) + + private val directionalKeypad: Grid[Char] = Vector( + Vector(' ', '^', 'A'), + Vector('<', 'v', '>'), + ) + + private val directionalOffsets = Map( + '^' -> Pos(0, -1), + '>' -> Pos(1, 0), + 'v' -> Pos(0, 1), + '<' -> Pos(-1, 0), + ) + + case class State(directionalPoss: List[Pos], numericPos: Pos, input: Code) { + + def numericPress(button: Char): Option[State] = button match { + case 'A' => + val newButton = numericKeypad(numericPos) + Some(copy(input = input + newButton)) + case _ => + val offset = directionalOffsets(button) + val newNumericPos = numericPos + offset + if (numericKeypad.containsPos(newNumericPos) && numericKeypad(newNumericPos) != ' ') + Some(copy(numericPos = newNumericPos)) + else + None // out of keypad + } + + def directionalPress(button: Char): Option[State] = directionalPoss match { + case Nil => numericPress(button) + case directionalPos :: newDirectionalPoss => + button match { + case 'A' => + val newButton = directionalKeypad(directionalPos) + copy(directionalPoss = newDirectionalPoss).directionalPress(newButton).map(newState => + newState.copy(directionalPoss = directionalPos :: newState.directionalPoss) + ) + case _ => + val offset = directionalOffsets(button) + val newDirectionalPos = directionalPos + offset + if (directionalKeypad.containsPos(newDirectionalPos) && directionalKeypad(newDirectionalPos) != ' ') + Some(copy(directionalPoss = newDirectionalPos :: newDirectionalPoss)) + else + None // out of keypad + } + } + + def userPress(button: Char): Option[State] = directionalPress(button) + } + + def shortestSequenceLength(code: Code): Int = { + + val graphSearch = new GraphSearch[State] with UnitNeighbors[State] { + override val startNode: State = State(List.fill(2)(directionalKeypad.posOf('A')), numericKeypad.posOf('A'), "") + + override def unitNeighbors(state: State): IterableOnce[State] = "^A".iterator.flatten(state.userPress).filter(s => code.startsWith(s.input)) + + override def isTargetNode(state: State, dist: Int): Boolean = state.input == code + } + + BFS.search(graphSearch).target.get._2 + } + + def codeComplexity(code: Code): Int = { + val numericPart = code.dropRight(1).toInt + shortestSequenceLength(code) * numericPart + } + + def sumCodeComplexity(codes: Seq[Code]): Int = codes.map(codeComplexity).sum + + def parseCodes(input: String): Seq[Code] = input.linesIterator.toSeq + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day21.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(sumCodeComplexity(parseCodes(input))) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala new file mode 100644 index 00000000..a4ced250 --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala @@ -0,0 +1,22 @@ +package eu.sim642.adventofcode2024 + +import Day21._ +import org.scalatest.funsuite.AnyFunSuite + +class Day21Test extends AnyFunSuite { + + val exampleInput = + """029A + |980A + |179A + |456A + |379A""".stripMargin + + test("Part 1 examples") { + assert(sumCodeComplexity(parseCodes(exampleInput)) == 126384) + } + + test("Part 1 input") { + assert(sumCodeComplexity(parseCodes(input)) == 157892) + } +} From c1f3b32bb1229f02cb50a3d167dcae023ebadab1 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sat, 21 Dec 2024 10:57:16 +0200 Subject: [PATCH 02/99] Solve 2024 day 21 part 2 --- .../eu/sim642/adventofcode2024/Day21.scala | 91 ++++++++++++++++++- .../sim642/adventofcode2024/Day21Test.scala | 14 ++- 2 files changed, 97 insertions(+), 8 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day21.scala b/src/main/scala/eu/sim642/adventofcode2024/Day21.scala index 14a1c909..5246d370 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day21.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day21.scala @@ -1,9 +1,12 @@ package eu.sim642.adventofcode2024 import eu.sim642.adventofcodelib.Grid -import eu.sim642.adventofcodelib.graph.{BFS, GraphSearch, Heuristic, UnitNeighbors} +import eu.sim642.adventofcodelib.graph.{BFS, GraphSearch, GraphTraversal, Heuristic, SimultaneousBFS, TargetNode, UnitNeighbors} import eu.sim642.adventofcodelib.pos.Pos import eu.sim642.adventofcodelib.GridImplicits.* +import eu.sim642.adventofcodelib.box.Box + +import scala.collection.mutable object Day21 { @@ -78,18 +81,96 @@ object Day21 { BFS.search(graphSearch).target.get._2 } - def codeComplexity(code: Code): Int = { + + // copied & modified from 2024 day 10 + // TODO: extract to library? + def pathSearch[A](graphSearch: GraphSearch[A] & UnitNeighbors[A]): GraphSearch[List[A]] & UnitNeighbors[List[A]] = { + new GraphSearch[List[A]] with UnitNeighbors[List[A]] { + override val startNode: List[A] = List(graphSearch.startNode) + + override def unitNeighbors(node: List[A]): IterableOnce[List[A]] = + graphSearch.unitNeighbors(node.head).iterator.map(_ :: node) + + override def isTargetNode(node: List[A], dist: Int): Boolean = graphSearch.isTargetNode(node.head, dist) + } + } + + private def keypadPaths(keypad: Grid[Char]): Map[(Char, Char), Set[Code]] = { + val box = Box(Pos.zero, Pos(keypad(0).size - 1, keypad.size - 1)) + (for { + startPos <- box.iterator + if keypad(startPos) != ' ' + targetPos <- box.iterator + if keypad(targetPos) != ' ' + } yield { + val graphSearch = new GraphSearch[Pos] with UnitNeighbors[Pos] with TargetNode[Pos] { + override val startNode: Pos = startPos + + override def unitNeighbors(pos: Pos): IterableOnce[Pos] = + Pos.axisOffsets.map(pos + _).filter(keypad.containsPos).filter(keypad(_) != ' ') + + override val targetNode: Pos = targetPos + } + (keypad(targetPos), keypad(startPos)) -> // flipped because paths are reversed + SimultaneousBFS.search(pathSearch(graphSearch)) + .nodes + .filter(_.head == targetPos) + .map(poss => + (poss lazyZip poss.tail) + .map({ case (p2, p1) => directionalOffsets.find(_._2 == p1 - p2).get._1 }) + .mkString + ) + .toSet + }).toMap + } + + private val numericPaths: Map[(Char, Char), Set[Code]] = keypadPaths(numericKeypad) + private val directionalPaths: Map[(Char, Char), Set[Code]] = keypadPaths(directionalKeypad) + + //println(numericPaths) + + def shortestSequenceLength2(code: Code, directionalKeypads: Int, i: Int = 0): Long = { + + val memo = mutable.Map.empty[(Code, Int), Long] + + def helper(code: Code, i: Int): Long = { + memo.getOrElseUpdate((code, i), { + //assert(directionalKeypads == 0) + code.foldLeft(('A', 0L))({ case ((prev, length), cur) => + val newLength = + (for { + path <- if (i == 0) numericPaths((prev, cur)) else directionalPaths((prev, cur)) + path2 = path + 'A' + len = + if (i == directionalKeypads) + path2.length.toLong + else + helper(path2, i + 1) + } yield len).min + (cur, length + newLength) + })._2 + }) + } + + helper(code, 0) + } + + + def codeComplexity(code: Code, directionalKeypads: Int): Long = { val numericPart = code.dropRight(1).toInt - shortestSequenceLength(code) * numericPart + shortestSequenceLength2(code, directionalKeypads) * numericPart } - def sumCodeComplexity(codes: Seq[Code]): Int = codes.map(codeComplexity).sum + def sumCodeComplexity(codes: Seq[Code], directionalKeypads: Int): Long = codes.map(codeComplexity(_, directionalKeypads)).sum def parseCodes(input: String): Seq[Code] = input.linesIterator.toSeq lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day21.txt")).mkString.trim def main(args: Array[String]): Unit = { - println(sumCodeComplexity(parseCodes(input))) + println(sumCodeComplexity(parseCodes(input), 2)) + println(sumCodeComplexity(parseCodes(input), 25)) + + // part 2: 1301407762 - too low (Int overflowed in shortestSequenceLength2) } } diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala index a4ced250..80baeaa0 100644 --- a/src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala @@ -13,10 +13,18 @@ class Day21Test extends AnyFunSuite { |379A""".stripMargin test("Part 1 examples") { - assert(sumCodeComplexity(parseCodes(exampleInput)) == 126384) + assert(shortestSequenceLength2("029A", 0) == "^^AvvvA".length) + assert(shortestSequenceLength2("029A", 1) == "v<>^AAvA<^AA>A^A".length) + assert(shortestSequenceLength2("029A", 2) == ">^AvAA<^A>A>^AvA^A^A^A>AAvA^AA>^AAAvA<^A>A".length) + + assert(sumCodeComplexity(parseCodes(exampleInput), 2) == 126384) + } + + test("Part 1 input answer") { + assert(sumCodeComplexity(parseCodes(input), 2) == 157892) } - test("Part 1 input") { - assert(sumCodeComplexity(parseCodes(input)) == 157892) + test("Part 2 input answer") { + assert(sumCodeComplexity(parseCodes(input), 25) == 197015606336332L) } } From 0fe17f7eec9530939b078e879f29253e4436d1b3 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sat, 21 Dec 2024 12:18:00 +0200 Subject: [PATCH 03/99] Extract and test solutions in 2024 day 21 --- .../eu/sim642/adventofcode2024/Day21.scala | 231 +++++++++--------- .../sim642/adventofcode2024/Day21Test.scala | 49 +++- 2 files changed, 157 insertions(+), 123 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day21.scala b/src/main/scala/eu/sim642/adventofcode2024/Day21.scala index 5246d370..93ea8a77 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day21.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day21.scala @@ -31,145 +31,154 @@ object Day21 { '<' -> Pos(-1, 0), ) - case class State(directionalPoss: List[Pos], numericPos: Pos, input: Code) { - - def numericPress(button: Char): Option[State] = button match { - case 'A' => - val newButton = numericKeypad(numericPos) - Some(copy(input = input + newButton)) - case _ => - val offset = directionalOffsets(button) - val newNumericPos = numericPos + offset - if (numericKeypad.containsPos(newNumericPos) && numericKeypad(newNumericPos) != ' ') - Some(copy(numericPos = newNumericPos)) - else - None // out of keypad - } + trait Solution { + def shortestSequenceLength(code: Code, directionalKeypads: Int): Long - def directionalPress(button: Char): Option[State] = directionalPoss match { - case Nil => numericPress(button) - case directionalPos :: newDirectionalPoss => - button match { - case 'A' => - val newButton = directionalKeypad(directionalPos) - copy(directionalPoss = newDirectionalPoss).directionalPress(newButton).map(newState => - newState.copy(directionalPoss = directionalPos :: newState.directionalPoss) - ) - case _ => - val offset = directionalOffsets(button) - val newDirectionalPos = directionalPos + offset - if (directionalKeypad.containsPos(newDirectionalPos) && directionalKeypad(newDirectionalPos) != ' ') - Some(copy(directionalPoss = newDirectionalPos :: newDirectionalPoss)) - else - None // out of keypad - } + def codeComplexity(code: Code, directionalKeypads: Int): Long = { + val numericPart = code.dropRight(1).toInt + shortestSequenceLength(code, directionalKeypads) * numericPart } - def userPress(button: Char): Option[State] = directionalPress(button) + def sumCodeComplexity(codes: Seq[Code], directionalKeypads: Int): Long = codes.map(codeComplexity(_, directionalKeypads)).sum } - def shortestSequenceLength(code: Code): Int = { - - val graphSearch = new GraphSearch[State] with UnitNeighbors[State] { - override val startNode: State = State(List.fill(2)(directionalKeypad.posOf('A')), numericKeypad.posOf('A'), "") + object NaiveSolution extends Solution { + + case class State(directionalPoss: List[Pos], numericPos: Pos, input: Code) { + + def numericPress(button: Char): Option[State] = button match { + case 'A' => + val newButton = numericKeypad(numericPos) + Some(copy(input = input + newButton)) + case _ => + val offset = directionalOffsets(button) + val newNumericPos = numericPos + offset + if (numericKeypad.containsPos(newNumericPos) && numericKeypad(newNumericPos) != ' ') + Some(copy(numericPos = newNumericPos)) + else + None // out of keypad + } - override def unitNeighbors(state: State): IterableOnce[State] = "^A".iterator.flatten(state.userPress).filter(s => code.startsWith(s.input)) + def directionalPress(button: Char): Option[State] = directionalPoss match { + case Nil => numericPress(button) + case directionalPos :: newDirectionalPoss => + button match { + case 'A' => + val newButton = directionalKeypad(directionalPos) + copy(directionalPoss = newDirectionalPoss).directionalPress(newButton).map(newState => + newState.copy(directionalPoss = directionalPos :: newState.directionalPoss) + ) + case _ => + val offset = directionalOffsets(button) + val newDirectionalPos = directionalPos + offset + if (directionalKeypad.containsPos(newDirectionalPos) && directionalKeypad(newDirectionalPos) != ' ') + Some(copy(directionalPoss = newDirectionalPos :: newDirectionalPoss)) + else + None // out of keypad + } + } - override def isTargetNode(state: State, dist: Int): Boolean = state.input == code + def userPress(button: Char): Option[State] = directionalPress(button) } - BFS.search(graphSearch).target.get._2 - } + override def shortestSequenceLength(code: Code, directionalKeypads: Int): Long = { + val graphSearch = new GraphSearch[State] with UnitNeighbors[State] { + override val startNode: State = State(List.fill(directionalKeypads)(directionalKeypad.posOf('A')), numericKeypad.posOf('A'), "") - // copied & modified from 2024 day 10 - // TODO: extract to library? - def pathSearch[A](graphSearch: GraphSearch[A] & UnitNeighbors[A]): GraphSearch[List[A]] & UnitNeighbors[List[A]] = { - new GraphSearch[List[A]] with UnitNeighbors[List[A]] { - override val startNode: List[A] = List(graphSearch.startNode) + override def unitNeighbors(state: State): IterableOnce[State] = "^A".iterator.flatten(state.userPress).filter(s => code.startsWith(s.input)) - override def unitNeighbors(node: List[A]): IterableOnce[List[A]] = - graphSearch.unitNeighbors(node.head).iterator.map(_ :: node) + override def isTargetNode(state: State, dist: Int): Boolean = state.input == code + } - override def isTargetNode(node: List[A], dist: Int): Boolean = graphSearch.isTargetNode(node.head, dist) + BFS.search(graphSearch).target.get._2 } } - private def keypadPaths(keypad: Grid[Char]): Map[(Char, Char), Set[Code]] = { - val box = Box(Pos.zero, Pos(keypad(0).size - 1, keypad.size - 1)) - (for { - startPos <- box.iterator - if keypad(startPos) != ' ' - targetPos <- box.iterator - if keypad(targetPos) != ' ' - } yield { - val graphSearch = new GraphSearch[Pos] with UnitNeighbors[Pos] with TargetNode[Pos] { - override val startNode: Pos = startPos - - override def unitNeighbors(pos: Pos): IterableOnce[Pos] = - Pos.axisOffsets.map(pos + _).filter(keypad.containsPos).filter(keypad(_) != ' ') - - override val targetNode: Pos = targetPos - } - (keypad(targetPos), keypad(startPos)) -> // flipped because paths are reversed - SimultaneousBFS.search(pathSearch(graphSearch)) - .nodes - .filter(_.head == targetPos) - .map(poss => - (poss lazyZip poss.tail) - .map({ case (p2, p1) => directionalOffsets.find(_._2 == p1 - p2).get._1 }) - .mkString - ) - .toSet - }).toMap - } + object DynamicProgrammingSolution extends Solution { + + // copied & modified from 2024 day 10 + // TODO: extract to library? + def pathSearch[A](graphSearch: GraphSearch[A] & UnitNeighbors[A]): GraphSearch[List[A]] & UnitNeighbors[List[A]] = { + new GraphSearch[List[A]] with UnitNeighbors[List[A]] { + override val startNode: List[A] = List(graphSearch.startNode) - private val numericPaths: Map[(Char, Char), Set[Code]] = keypadPaths(numericKeypad) - private val directionalPaths: Map[(Char, Char), Set[Code]] = keypadPaths(directionalKeypad) - - //println(numericPaths) - - def shortestSequenceLength2(code: Code, directionalKeypads: Int, i: Int = 0): Long = { - - val memo = mutable.Map.empty[(Code, Int), Long] - - def helper(code: Code, i: Int): Long = { - memo.getOrElseUpdate((code, i), { - //assert(directionalKeypads == 0) - code.foldLeft(('A', 0L))({ case ((prev, length), cur) => - val newLength = - (for { - path <- if (i == 0) numericPaths((prev, cur)) else directionalPaths((prev, cur)) - path2 = path + 'A' - len = - if (i == directionalKeypads) - path2.length.toLong - else - helper(path2, i + 1) - } yield len).min - (cur, length + newLength) - })._2 - }) + override def unitNeighbors(node: List[A]): IterableOnce[List[A]] = + graphSearch.unitNeighbors(node.head).iterator.map(_ :: node) + + override def isTargetNode(node: List[A], dist: Int): Boolean = graphSearch.isTargetNode(node.head, dist) + } } - helper(code, 0) - } + private def keypadPaths(keypad: Grid[Char]): Map[(Char, Char), Set[Code]] = { + val box = Box(Pos.zero, Pos(keypad(0).size - 1, keypad.size - 1)) + (for { + startPos <- box.iterator + if keypad(startPos) != ' ' + targetPos <- box.iterator + if keypad(targetPos) != ' ' + } yield { + val graphSearch = new GraphSearch[Pos] with UnitNeighbors[Pos] with TargetNode[Pos] { + override val startNode: Pos = startPos + + override def unitNeighbors(pos: Pos): IterableOnce[Pos] = + Pos.axisOffsets.map(pos + _).filter(keypad.containsPos).filter(keypad(_) != ' ') + + override val targetNode: Pos = targetPos + } + (keypad(targetPos), keypad(startPos)) -> // flipped because paths are reversed + SimultaneousBFS.search(pathSearch(graphSearch)) + .nodes + .filter(_.head == targetPos) + .map(poss => + (poss lazyZip poss.tail) + .map({ case (p2, p1) => directionalOffsets.find(_._2 == p1 - p2).get._1 }) + .mkString + ) + .toSet + }).toMap + } + private val numericPaths: Map[(Char, Char), Set[Code]] = keypadPaths(numericKeypad) + private val directionalPaths: Map[(Char, Char), Set[Code]] = keypadPaths(directionalKeypad) + + override def shortestSequenceLength(code: Code, directionalKeypads: Int): Long = { + val memo = mutable.Map.empty[(Code, Int), Long] + + def helper(code: Code, i: Int): Long = { + memo.getOrElseUpdate((code, i), { + //assert(directionalKeypads == 0) + code.foldLeft(('A', 0L))({ case ((prev, length), cur) => + val newLength = + (for { + path <- if (i == 0) numericPaths((prev, cur)) else directionalPaths((prev, cur)) + path2 = path + 'A' + len = + if (i == directionalKeypads) + path2.length.toLong + else + helper(path2, i + 1) + } yield len).min + (cur, length + newLength) + })._2 + }) + } - def codeComplexity(code: Code, directionalKeypads: Int): Long = { - val numericPart = code.dropRight(1).toInt - shortestSequenceLength2(code, directionalKeypads) * numericPart + helper(code, 0) + } } - def sumCodeComplexity(codes: Seq[Code], directionalKeypads: Int): Long = codes.map(codeComplexity(_, directionalKeypads)).sum - def parseCodes(input: String): Seq[Code] = input.linesIterator.toSeq lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day21.txt")).mkString.trim + val part1DirectionalKeypads = 2 + val part2DirectionalKeypads = 25 + def main(args: Array[String]): Unit = { - println(sumCodeComplexity(parseCodes(input), 2)) - println(sumCodeComplexity(parseCodes(input), 25)) + import DynamicProgrammingSolution._ + println(sumCodeComplexity(parseCodes(input), part1DirectionalKeypads)) + println(sumCodeComplexity(parseCodes(input), part2DirectionalKeypads)) // part 2: 1301407762 - too low (Int overflowed in shortestSequenceLength2) } diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala index 80baeaa0..f8cb30aa 100644 --- a/src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2024/Day21Test.scala @@ -1,9 +1,16 @@ package eu.sim642.adventofcode2024 -import Day21._ +import Day21.* +import Day21Test.* +import org.scalatest.Suites import org.scalatest.funsuite.AnyFunSuite -class Day21Test extends AnyFunSuite { +class Day21Test extends Suites( + new NaiveSolutionTest, + new DynamicProgrammingSolutionTest, +) + +object Day21Test { val exampleInput = """029A @@ -12,19 +19,37 @@ class Day21Test extends AnyFunSuite { |456A |379A""".stripMargin - test("Part 1 examples") { - assert(shortestSequenceLength2("029A", 0) == "^^AvvvA".length) - assert(shortestSequenceLength2("029A", 1) == "v<>^AAvA<^AA>A^A".length) - assert(shortestSequenceLength2("029A", 2) == ">^AvAA<^A>A>^AvA^A^A^A>AAvA^AA>^AAAvA<^A>A".length) + abstract class SolutionTest(solution: Solution) extends AnyFunSuite { + import solution._ - assert(sumCodeComplexity(parseCodes(exampleInput), 2) == 126384) - } + test("Part 1 examples") { + assert(shortestSequenceLength("029A", 0) == "^^AvvvA".length) + assert(shortestSequenceLength("029A", 1) == "v<>^AAvA<^AA>A^A".length) + assert(shortestSequenceLength("029A", 2) == ">^AvAA<^A>A>^AvA^A^A^A>AAvA^AA>^AAAvA<^A>A".length) + + assert(sumCodeComplexity(parseCodes(exampleInput), part1DirectionalKeypads) == 126384) + } + + test("Part 1 input answer") { + assert(sumCodeComplexity(parseCodes(input), part1DirectionalKeypads) == 157892) + } - test("Part 1 input answer") { - assert(sumCodeComplexity(parseCodes(input), 2) == 157892) + protected val testPart2: Boolean = true + + if (testPart2) { + test("Part 2 examples") { + assert(sumCodeComplexity(parseCodes(exampleInput), part2DirectionalKeypads) == 154115708116294L) // not in text + } + + test("Part 2 input answer") { + assert(sumCodeComplexity(parseCodes(input), part2DirectionalKeypads) == 197015606336332L) + } + } } - test("Part 2 input answer") { - assert(sumCodeComplexity(parseCodes(input), 25) == 197015606336332L) + class NaiveSolutionTest extends SolutionTest(NaiveSolution) { + override protected val testPart2: Boolean = false } + + class DynamicProgrammingSolutionTest extends SolutionTest(DynamicProgrammingSolution) } From e66dd8b1a12549f2f27e95ffff56affc0fd09f48 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sat, 21 Dec 2024 13:18:38 +0200 Subject: [PATCH 04/99] Clean up 2024 day 21 solutions --- .../eu/sim642/adventofcode2024/Day21.scala | 55 ++++++++++--------- 1 file changed, 30 insertions(+), 25 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day21.scala b/src/main/scala/eu/sim642/adventofcode2024/Day21.scala index 93ea8a77..b81f5303 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day21.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day21.scala @@ -1,10 +1,10 @@ package eu.sim642.adventofcode2024 import eu.sim642.adventofcodelib.Grid -import eu.sim642.adventofcodelib.graph.{BFS, GraphSearch, GraphTraversal, Heuristic, SimultaneousBFS, TargetNode, UnitNeighbors} -import eu.sim642.adventofcodelib.pos.Pos import eu.sim642.adventofcodelib.GridImplicits.* import eu.sim642.adventofcodelib.box.Box +import eu.sim642.adventofcodelib.graph.* +import eu.sim642.adventofcodelib.pos.Pos import scala.collection.mutable @@ -46,7 +46,7 @@ object Day21 { case class State(directionalPoss: List[Pos], numericPos: Pos, input: Code) { - def numericPress(button: Char): Option[State] = button match { + private def numericPress(button: Char): Option[State] = button match { case 'A' => val newButton = numericKeypad(numericPos) Some(copy(input = input + newButton)) @@ -59,7 +59,7 @@ object Day21 { None // out of keypad } - def directionalPress(button: Char): Option[State] = directionalPoss match { + private def directionalPress(button: Char): Option[State] = directionalPoss match { case Nil => numericPress(button) case directionalPos :: newDirectionalPoss => button match { @@ -84,9 +84,11 @@ object Day21 { override def shortestSequenceLength(code: Code, directionalKeypads: Int): Long = { val graphSearch = new GraphSearch[State] with UnitNeighbors[State] { - override val startNode: State = State(List.fill(directionalKeypads)(directionalKeypad.posOf('A')), numericKeypad.posOf('A'), "") + override val startNode: State = + State(List.fill(directionalKeypads)(directionalKeypad.posOf('A')), numericKeypad.posOf('A'), "") - override def unitNeighbors(state: State): IterableOnce[State] = "^A".iterator.flatten(state.userPress).filter(s => code.startsWith(s.input)) + override def unitNeighbors(state: State): IterableOnce[State] = + "^A".iterator.flatten(state.userPress).filter(newState => code.startsWith(newState.input)) override def isTargetNode(state: State, dist: Int): Boolean = state.input == code } @@ -110,14 +112,18 @@ object Day21 { } } + private val offsetDirectionals: Map[Pos, Char] = directionalOffsets.map(_.swap) + private def keypadPaths(keypad: Grid[Char]): Map[(Char, Char), Set[Code]] = { val box = Box(Pos.zero, Pos(keypad(0).size - 1, keypad.size - 1)) + // TODO: use one traversal per position (to all other positions), instead of pairwise (for { startPos <- box.iterator if keypad(startPos) != ' ' targetPos <- box.iterator if keypad(targetPos) != ' ' } yield { + // TODO: use multi-predecessor BFS to construct all shortest paths val graphSearch = new GraphSearch[Pos] with UnitNeighbors[Pos] with TargetNode[Pos] { override val startNode: Pos = startPos @@ -132,7 +138,7 @@ object Day21 { .filter(_.head == targetPos) .map(poss => (poss lazyZip poss.tail) - .map({ case (p2, p1) => directionalOffsets.find(_._2 == p1 - p2).get._1 }) + .map({ (p2, p1) => offsetDirectionals(p1 - p2) }) .mkString ) .toSet @@ -142,26 +148,25 @@ object Day21 { private val numericPaths: Map[(Char, Char), Set[Code]] = keypadPaths(numericKeypad) private val directionalPaths: Map[(Char, Char), Set[Code]] = keypadPaths(directionalKeypad) + def keypadPaths(keypad: Int): Map[(Char, Char), Set[Code]] = if (keypad == 0) numericPaths else directionalPaths + override def shortestSequenceLength(code: Code, directionalKeypads: Int): Long = { val memo = mutable.Map.empty[(Code, Int), Long] - def helper(code: Code, i: Int): Long = { - memo.getOrElseUpdate((code, i), { - //assert(directionalKeypads == 0) - code.foldLeft(('A', 0L))({ case ((prev, length), cur) => - val newLength = - (for { - path <- if (i == 0) numericPaths((prev, cur)) else directionalPaths((prev, cur)) - path2 = path + 'A' - len = - if (i == directionalKeypads) - path2.length.toLong - else - helper(path2, i + 1) - } yield len).min - (cur, length + newLength) - })._2 - }) + def helper(code: Code, keypad: Int): Long = { + if (keypad == directionalKeypads + 1) + code.length + else { + memo.getOrElseUpdate((code, keypad), { + (("A" + code) lazyZip code) // start moving from A + .map({ (prev, cur) => + keypadPaths(keypad)((prev, cur)) + .map(path => helper(path + 'A', keypad + 1)) // end at A to press + .min + }) + .sum + }) + } } helper(code, 0) @@ -176,7 +181,7 @@ object Day21 { val part2DirectionalKeypads = 25 def main(args: Array[String]): Unit = { - import DynamicProgrammingSolution._ + import DynamicProgrammingSolution.* println(sumCodeComplexity(parseCodes(input), part1DirectionalKeypads)) println(sumCodeComplexity(parseCodes(input), part2DirectionalKeypads)) From 18ab2edea9e43ac6003a8bcb75a37b4b18d216fe Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 22 Dec 2024 09:22:16 +0200 Subject: [PATCH 05/99] Solve 2024 day 22 part 1 --- .../eu/sim642/adventofcode2024/day22.txt | 2462 +++++++++++++++++ .../eu/sim642/adventofcode2024/Day22.scala | 31 + .../sim642/adventofcode2024/Day22Test.scala | 31 + 3 files changed, 2524 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2024/day22.txt create mode 100644 src/main/scala/eu/sim642/adventofcode2024/Day22.scala create mode 100644 src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala diff --git a/src/main/resources/eu/sim642/adventofcode2024/day22.txt b/src/main/resources/eu/sim642/adventofcode2024/day22.txt new file mode 100644 index 00000000..d71e66ec --- /dev/null +++ b/src/main/resources/eu/sim642/adventofcode2024/day22.txt @@ -0,0 +1,2462 @@ +9934779 +2152381 +503629 +16463157 +6604765 +10656550 +14732578 +1521218 +16374827 +10971068 +482403 +5712888 +2066009 +3554443 +12260252 +15389653 +15247095 +8662566 +9761795 +306878 +1733065 +6289511 +7527385 +12802412 +5712214 +1008199 +6571712 +1150493 +6399094 +16132129 +1385556 +1158173 +16065247 +13185959 +10781917 +9511646 +7591752 +3451813 +9242364 +6788303 +12055918 +10107205 +979884 +11530140 +14020629 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b/src/main/scala/eu/sim642/adventofcode2024/Day22.scala @@ -0,0 +1,31 @@ +package eu.sim642.adventofcode2024 + +import eu.sim642.adventofcodelib.IteratorImplicits._ + +object Day22 { + + type Secret = Long + + def mix(secret: Secret, value: Secret): Secret = value ^ secret + def prune(secret: Secret): Secret = secret % 16777216 // TODO: bitwise + + def nextSecret(secret: Secret): Secret = { + val secret1 = prune(mix(secret, secret * 64)) + val secret2 = prune(mix(secret1, secret1 / 32)) + prune(mix(secret2, secret2 * 2048)) + } + + def secretAfter(initialSecret: Secret, after: Int = 2000): Secret = + Iterator.iterate(initialSecret)(nextSecret)(after) + + def sumSecretsAfter(secrets: Seq[Secret], after: Int = 2000): Secret = + secrets.map(secretAfter(_, after)).sum + + def parseSecrets(input: String): Seq[Secret] = input.linesIterator.map(_.toLong).toSeq + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day22.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(sumSecretsAfter(parseSecrets(input))) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala new file mode 100644 index 00000000..12490287 --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala @@ -0,0 +1,31 @@ +package eu.sim642.adventofcode2024 + +import Day22._ +import org.scalatest.funsuite.AnyFunSuite + +class Day22Test extends AnyFunSuite { + + val exampleInput = + """1 + |10 + |100 + |2024""".stripMargin + + test("Part 1 examples") { + assert(secretAfter(123, 1) == 15887950) + assert(secretAfter(123, 2) == 16495136) + assert(secretAfter(123, 3) == 527345) + assert(secretAfter(123, 4) == 704524) + assert(secretAfter(123, 5) == 1553684) + assert(secretAfter(123, 6) == 12683156) + assert(secretAfter(123, 7) == 11100544) + assert(secretAfter(123, 8) == 12249484) + assert(secretAfter(123, 9) == 7753432) + assert(secretAfter(123, 10) == 5908254) + assert(sumSecretsAfter(parseSecrets(exampleInput)) == 37327623) + } + + test("Part 1 input answer") { + assert(sumSecretsAfter(parseSecrets(input)) == 21147129593L) + } +} From 0103bd6aa7a758afa08b30ecda5e77ebbbe05f39 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 22 Dec 2024 09:39:33 +0200 Subject: [PATCH 06/99] Solve 2024 day 22 part 2 --- .../eu/sim642/adventofcode2024/Day22.scala | 21 +++++++++++++++++++ .../sim642/adventofcode2024/Day22Test.scala | 14 +++++++++++++ 2 files changed, 35 insertions(+) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day22.scala b/src/main/scala/eu/sim642/adventofcode2024/Day22.scala index 0484f576..0c7ba679 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day22.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day22.scala @@ -21,11 +21,32 @@ object Day22 { def sumSecretsAfter(secrets: Seq[Secret], after: Int = 2000): Secret = secrets.map(secretAfter(_, after)).sum + def mostBananas(secrets: Seq[Secret]): Int = { + // TODO: optimize (~4.7s) + val secretMaps = secrets + .map({ initialSecret => + Iterator.iterate(initialSecret, 2000 + 1)(nextSecret) + .map(_ % 10) + .map(_.toInt) + .sliding(5) + .map({ prices => + val changes = (prices lazyZip prices.tail).map((a, b) => b - a) + changes -> prices.last + }) + .groupMapReduce(_._1)(_._2)((a, _) => a) + }) + val secretMaps2 = secretMaps + .flatten + .groupMapReduce(_._1)(_._2)(_ + _) + secretMaps2.values.max + } + def parseSecrets(input: String): Seq[Secret] = input.linesIterator.map(_.toLong).toSeq lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day22.txt")).mkString.trim def main(args: Array[String]): Unit = { println(sumSecretsAfter(parseSecrets(input))) + println(mostBananas(parseSecrets(input))) } } diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala index 12490287..b81cbfd7 100644 --- a/src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala @@ -11,6 +11,12 @@ class Day22Test extends AnyFunSuite { |100 |2024""".stripMargin + val exampleInput2 = + """1 + |2 + |3 + |2024""".stripMargin + test("Part 1 examples") { assert(secretAfter(123, 1) == 15887950) assert(secretAfter(123, 2) == 16495136) @@ -28,4 +34,12 @@ class Day22Test extends AnyFunSuite { test("Part 1 input answer") { assert(sumSecretsAfter(parseSecrets(input)) == 21147129593L) } + + test("Part 2 examples") { + assert(mostBananas(parseSecrets(exampleInput2)) == 23) + } + + test("Part 2 input answer") { + assert(mostBananas(parseSecrets(input)) == 2445) + } } From d08f03072f77210360689ad708447e92ac610430 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 22 Dec 2024 13:48:34 +0200 Subject: [PATCH 07/99] Test 2024 day 22 examples with scalacheck --- .../eu/sim642/adventofcode2024/Day22.scala | 8 ++--- .../sim642/adventofcode2024/Day22Test.scala | 35 ++++++++++++------- 2 files changed, 27 insertions(+), 16 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day22.scala b/src/main/scala/eu/sim642/adventofcode2024/Day22.scala index 0c7ba679..a263715a 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day22.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day22.scala @@ -15,17 +15,17 @@ object Day22 { prune(mix(secret2, secret2 * 2048)) } - def secretAfter(initialSecret: Secret, after: Int = 2000): Secret = - Iterator.iterate(initialSecret)(nextSecret)(after) + def secretIterator(initialSecret: Secret): Iterator[Secret] = + Iterator.iterate(initialSecret)(nextSecret) def sumSecretsAfter(secrets: Seq[Secret], after: Int = 2000): Secret = - secrets.map(secretAfter(_, after)).sum + secrets.map(secretIterator(_)(after)).sum def mostBananas(secrets: Seq[Secret]): Int = { // TODO: optimize (~4.7s) val secretMaps = secrets .map({ initialSecret => - Iterator.iterate(initialSecret, 2000 + 1)(nextSecret) + secretIterator(initialSecret).take(2000 + 1) .map(_ % 10) .map(_.toInt) .sliding(5) diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala index b81cbfd7..6867475f 100644 --- a/src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2024/Day22Test.scala @@ -1,9 +1,10 @@ package eu.sim642.adventofcode2024 -import Day22._ +import Day22.* import org.scalatest.funsuite.AnyFunSuite +import org.scalatestplus.scalacheck.ScalaCheckPropertyChecks -class Day22Test extends AnyFunSuite { +class Day22Test extends AnyFunSuite with ScalaCheckPropertyChecks { val exampleInput = """1 @@ -18,16 +19,26 @@ class Day22Test extends AnyFunSuite { |2024""".stripMargin test("Part 1 examples") { - assert(secretAfter(123, 1) == 15887950) - assert(secretAfter(123, 2) == 16495136) - assert(secretAfter(123, 3) == 527345) - assert(secretAfter(123, 4) == 704524) - assert(secretAfter(123, 5) == 1553684) - assert(secretAfter(123, 6) == 12683156) - assert(secretAfter(123, 7) == 11100544) - assert(secretAfter(123, 8) == 12249484) - assert(secretAfter(123, 9) == 7753432) - assert(secretAfter(123, 10) == 5908254) + val secrets = Table( + "secret", + 123, + 15887950, + 16495136, + 527345, + 704524, + 1553684, + 12683156, + 11100544, + 12249484, + 7753432, + 5908254, + ) + + val it = secretIterator(123) + forAll (secrets) { secret => + assert(it.next() == secret) + } + assert(sumSecretsAfter(parseSecrets(exampleInput)) == 37327623) } From 83401614c681d8a5f1c645e5918ea69eb7172f43 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 23 Dec 2024 10:20:32 +0200 Subject: [PATCH 08/99] Solve 2024 day 23 part 1 --- .../eu/sim642/adventofcode2024/day23.txt | 3380 +++++++++++++++++ .../eu/sim642/adventofcode2024/Day23.scala | 32 + .../sim642/adventofcode2024/Day23Test.scala | 49 + 3 files changed, 3461 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2024/day23.txt 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+bw-iv +zn-vt +ck-qy +be-cq +by-th +fq-ar +md-cl +tk-pl +vu-au +lc-jl +xa-jk +ey-gb +oo-tt +ks-oc +gj-ga +pt-jv +xa-uo +pc-qj +kt-gg +zp-vm +nv-mz +ae-ra +iw-vc +da-vl +bs-aq +mc-fl +ro-cz +xz-my +hv-yr +nm-cm +fb-dn +wd-nx +pa-iq +zv-ng +vd-co +xo-li +di-wp +ux-or +tf-bk +vr-co +gx-nt +jb-dh +um-wu +wf-gi +ns-ey +ac-mu +ur-jf +px-gt +bd-gt +my-sv +ac-lk +vw-gx +wh-hc +jc-hd +ky-pn +qj-hw +kq-lt +os-li +zw-iz +ab-co +uh-qz +yw-fi +jq-jr +go-ti +ho-fg +rd-wd +qr-ou +bj-um +al-tg +tv-kg +ix-cu +ax-xa +na-cr +jd-ku +xp-hl +pu-ho +uf-st +jt-tr +gc-sz +jm-xk +ft-bd +qe-bl +qe-fx +hx-hc +wn-us +ll-zb +go-sa +iz-zv +ul-si +eu-as +us-ny +xr-ll +ju-hu +gu-zx +cc-og +oj-ft +is-ga +vc-rv +xk-hl +gb-ne +hv-yi +qq-ds +er-nr +pe-gg +tb-gv +nb-pd +pc-ja +uk-ba +mq-dt +vc-jc +mk-ja +ly-zy +ew-tj +hk-mx +gw-jf +ke-rv +lt-uf +ur-je +ri-ux +cc-tj +ub-zt +se-ie +sj-wn +rj-oa +lq-sy +yo-xh +rj-qq +xv-kl +yq-oy +mz-hv +hp-uv +wu-bj +pl-dt +wt-hk +ic-jb +kf-or +zb-hj +qz-uk +pa-nh +mu-dd +vj-em +pa-ot +fo-ae +pc-se +nm-ir +zs-cj +aa-cz +hr-ss +fh-vf +hw-yj +po-no diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day23.scala b/src/main/scala/eu/sim642/adventofcode2024/Day23.scala new file mode 100644 index 00000000..fd7d6bdd --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcode2024/Day23.scala @@ -0,0 +1,32 @@ +package eu.sim642.adventofcode2024 + +object Day23 { + + type Computer = String + type Edge = (Computer, Computer) + + def find3Cliques(edges: Set[Edge]): Set[Set[Computer]] = { + val neighbors = (edges ++ edges.map(_.swap)).groupMap(_._1)(_._2) + + for { + (from, to) <- edges + third <- neighbors(from) & neighbors(to) + } yield Set(from, third, to) + } + + def count3CliquesT(edges: Set[Edge]): Int = find3Cliques(edges).count(_.exists(_.startsWith("t"))) + + def parseEdge(s: String): Edge = s match { + case s"$from-$to" => (from, to) + } + + def parseEdges(input: String): Set[Edge] = input.linesIterator.map(parseEdge).toSet + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day23.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(count3CliquesT(parseEdges(input))) + + // part 1: 2366 - too high (used contains 't' instead of startsWith 't') + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day23Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day23Test.scala new file mode 100644 index 00000000..aba27855 --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2024/Day23Test.scala @@ -0,0 +1,49 @@ +package eu.sim642.adventofcode2024 + +import Day23._ +import org.scalatest.funsuite.AnyFunSuite + +class Day23Test extends AnyFunSuite { + + val exampleInput = + """kh-tc + |qp-kh + |de-cg + |ka-co + |yn-aq + |qp-ub + |cg-tb + |vc-aq + |tb-ka + |wh-tc + |yn-cg + |kh-ub + |ta-co + |de-co + |tc-td + |tb-wq + |wh-td + |ta-ka + |td-qp + |aq-cg + |wq-ub + |ub-vc + |de-ta + |wq-aq + |wq-vc + |wh-yn + |ka-de + |kh-ta + |co-tc + |wh-qp + |tb-vc + |td-yn""".stripMargin + + test("Part 1 examples") { + assert(count3CliquesT(parseEdges(exampleInput)) == 7) + } + + test("Part 1 input answer") { + assert(count3CliquesT(parseEdges(input)) == 1437) + } +} From fe45dcfd130932b5aa57ef04a4378fdfc589b7b6 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 23 Dec 2024 10:27:10 +0200 Subject: [PATCH 09/99] Solve 2024 day 23 part 2 --- .../eu/sim642/adventofcode2024/Day23.scala | 39 +++++++++++++++++++ .../sim642/adventofcode2024/Day23Test.scala | 8 ++++ 2 files changed, 47 insertions(+) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day23.scala b/src/main/scala/eu/sim642/adventofcode2024/Day23.scala index fd7d6bdd..129518be 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day23.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day23.scala @@ -16,6 +16,44 @@ object Day23 { def count3CliquesT(edges: Set[Edge]): Int = find3Cliques(edges).count(_.exists(_.startsWith("t"))) + // copied from 2018 day 23 + // TODO: move to library + def maximumClique(neighbors: Map[Computer, Set[Computer]]): Set[Computer] = { + var best: Set[Computer] = Set.empty + + def bronKerbosh(r: Set[Computer], p: Set[Computer], x: Set[Computer]): Unit = { + if (p.isEmpty && x.isEmpty) { + //println(r) + if (r.size > best.size) + best = r + } + else { + //val u = p.headOption.getOrElse(x.head) + val u = (p ++ x).maxBy(neighbors(_).size) // pivot on highest degree + var p2 = p + var x2 = x + for (v <- p -- neighbors(u)) { + bronKerbosh(r + v, p2 intersect neighbors(v), x2 intersect neighbors(v)) + p2 -= v + x2 += v + } + } + } + + bronKerbosh(Set.empty, neighbors.keySet, Set.empty) + best + } + + def maximumClique(edges: Set[Edge]): Set[Computer] = { + val neighbors = (edges ++ edges.map(_.swap)).groupMap(_._1)(_._2) + maximumClique(neighbors) + } + + def lanPartyPassword(edges: Set[Edge]): String = { + val clique = maximumClique(edges) + clique.toSeq.sorted.mkString(",") + } + def parseEdge(s: String): Edge = s match { case s"$from-$to" => (from, to) } @@ -26,6 +64,7 @@ object Day23 { def main(args: Array[String]): Unit = { println(count3CliquesT(parseEdges(input))) + println(lanPartyPassword(parseEdges(input))) // part 1: 2366 - too high (used contains 't' instead of startsWith 't') } diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day23Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day23Test.scala index aba27855..e58c66b1 100644 --- a/src/test/scala/eu/sim642/adventofcode2024/Day23Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2024/Day23Test.scala @@ -46,4 +46,12 @@ class Day23Test extends AnyFunSuite { test("Part 1 input answer") { assert(count3CliquesT(parseEdges(input)) == 1437) } + + test("Part 2 examples") { + assert(lanPartyPassword(parseEdges(exampleInput)) == "co,de,ka,ta") + } + + test("Part 2 input answer") { + assert(lanPartyPassword(parseEdges(input)) == "da,do,gx,ly,mb,ns,nt,pz,sc,si,tp,ul,vl") + } } From 6f414cd4852d8f534c53b4ec333647282fbc9620 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 23 Dec 2024 16:28:39 +0200 Subject: [PATCH 10/99] Extract BronKerbosch to library --- .../eu/sim642/adventofcode2018/Day23.scala | 29 ++--------------- .../eu/sim642/adventofcode2024/Day23.scala | 32 ++----------------- .../adventofcodelib/graph/BronKerbosch.scala | 31 ++++++++++++++++++ 3 files changed, 36 insertions(+), 56 deletions(-) create mode 100644 src/main/scala/eu/sim642/adventofcodelib/graph/BronKerbosch.scala diff --git a/src/main/scala/eu/sim642/adventofcode2018/Day23.scala b/src/main/scala/eu/sim642/adventofcode2018/Day23.scala index 63c04e44..543b54df 100644 --- a/src/main/scala/eu/sim642/adventofcode2018/Day23.scala +++ b/src/main/scala/eu/sim642/adventofcode2018/Day23.scala @@ -4,6 +4,7 @@ import eu.sim642.adventofcodelib.box.{Box3, Box4} import eu.sim642.adventofcodelib.pos.Pos3 import eu.sim642.adventofcodelib.pos.Pos4 import eu.sim642.adventofcodelib.IntegralImplicits.* +import eu.sim642.adventofcodelib.graph.BronKerbosch import scala.collection.mutable import scala.util.boundary @@ -40,35 +41,9 @@ object Day23 { } object NaiveCliquePart2Solution extends Part2Solution { - def maximumClique(neighbors: Map[Nanobot, Set[Nanobot]]): Set[Nanobot] = { - var best: Set[Nanobot] = Set.empty - - def bronKerbosh(r: Set[Nanobot], p: Set[Nanobot], x: Set[Nanobot]): Unit = { - if (p.isEmpty && x.isEmpty) { - //println(r) - if (r.size > best.size) - best = r - } - else { - //val u = p.headOption.getOrElse(x.head) - val u = (p ++ x).maxBy(neighbors(_).size) // pivot on highest degree - var p2 = p - var x2 = x - for (v <- p -- neighbors(u)) { - bronKerbosh(r + v, p2 intersect neighbors(v), x2 intersect neighbors(v)) - p2 -= v - x2 += v - } - } - } - - bronKerbosh(Set.empty, neighbors.keySet, Set.empty) - best - } - def maximumOverlap(nanobots: Seq[Nanobot]): Set[Nanobot] = { val neighbors: Map[Nanobot, Set[Nanobot]] = nanobots.map(nanobot1 => nanobot1 -> nanobots.filter(nanobot2 => nanobot2 != nanobot1 && nanobot1.overlaps(nanobot2)).toSet).toMap - maximumClique(neighbors) + BronKerbosch.maximumClique(neighbors) } def closestMostNanobots(nanobots: Seq[Nanobot]): Int = { diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day23.scala b/src/main/scala/eu/sim642/adventofcode2024/Day23.scala index 129518be..e5435c8a 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day23.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day23.scala @@ -1,5 +1,7 @@ package eu.sim642.adventofcode2024 +import eu.sim642.adventofcodelib.graph.BronKerbosch + object Day23 { type Computer = String @@ -16,37 +18,9 @@ object Day23 { def count3CliquesT(edges: Set[Edge]): Int = find3Cliques(edges).count(_.exists(_.startsWith("t"))) - // copied from 2018 day 23 - // TODO: move to library - def maximumClique(neighbors: Map[Computer, Set[Computer]]): Set[Computer] = { - var best: Set[Computer] = Set.empty - - def bronKerbosh(r: Set[Computer], p: Set[Computer], x: Set[Computer]): Unit = { - if (p.isEmpty && x.isEmpty) { - //println(r) - if (r.size > best.size) - best = r - } - else { - //val u = p.headOption.getOrElse(x.head) - val u = (p ++ x).maxBy(neighbors(_).size) // pivot on highest degree - var p2 = p - var x2 = x - for (v <- p -- neighbors(u)) { - bronKerbosh(r + v, p2 intersect neighbors(v), x2 intersect neighbors(v)) - p2 -= v - x2 += v - } - } - } - - bronKerbosh(Set.empty, neighbors.keySet, Set.empty) - best - } - def maximumClique(edges: Set[Edge]): Set[Computer] = { val neighbors = (edges ++ edges.map(_.swap)).groupMap(_._1)(_._2) - maximumClique(neighbors) + BronKerbosch.maximumClique(neighbors) } def lanPartyPassword(edges: Set[Edge]): String = { diff --git a/src/main/scala/eu/sim642/adventofcodelib/graph/BronKerbosch.scala b/src/main/scala/eu/sim642/adventofcodelib/graph/BronKerbosch.scala new file mode 100644 index 00000000..5550e1fa --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcodelib/graph/BronKerbosch.scala @@ -0,0 +1,31 @@ +package eu.sim642.adventofcodelib.graph + +object BronKerbosch { + + // moved from 2018 day 23 + def maximumClique[A](neighbors: Map[A, Set[A]]): Set[A] = { + var best: Set[A] = Set.empty + + def bronKerbosch(r: Set[A], p: Set[A], x: Set[A]): Unit = { + if (p.isEmpty && x.isEmpty) { + //println(r) + if (r.size > best.size) + best = r + } + else { + //val u = p.headOption.getOrElse(x.head) + val u = (p ++ x).maxBy(neighbors(_).size) // pivot on highest degree + var p2 = p + var x2 = x + for (v <- p -- neighbors(u)) { + bronKerbosch(r + v, p2 intersect neighbors(v), x2 intersect neighbors(v)) + p2 -= v + x2 += v + } + } + } + + bronKerbosch(Set.empty, neighbors.keySet, Set.empty) + best + } +} From c2d2f7785b1ed34fbf776ebc00aff92e4aff66ae Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 23 Dec 2024 16:46:36 +0200 Subject: [PATCH 11/99] Add BronKerbosch.maximalCliques iterator (unused) --- .../adventofcodelib/graph/BronKerbosch.scala | 29 +++++++++++++++++++ 1 file changed, 29 insertions(+) diff --git a/src/main/scala/eu/sim642/adventofcodelib/graph/BronKerbosch.scala b/src/main/scala/eu/sim642/adventofcodelib/graph/BronKerbosch.scala index 5550e1fa..fde07173 100644 --- a/src/main/scala/eu/sim642/adventofcodelib/graph/BronKerbosch.scala +++ b/src/main/scala/eu/sim642/adventofcodelib/graph/BronKerbosch.scala @@ -2,6 +2,35 @@ package eu.sim642.adventofcodelib.graph object BronKerbosch { + // unused + def maximalCliques[A](neighbors: Map[A, Set[A]]): Iterator[Set[A]] = { + + def bronKerbosch(r: Set[A], p: Set[A], x: Set[A]): Iterator[Set[A]] = { + if (p.isEmpty) { + if (x.isEmpty) + Iterator.single(r) + else + Iterator.empty + } + else { + //val u = p.headOption.getOrElse(x.head) + val u = (p ++ x).maxBy(neighbors(_).size) // pivot on highest degree + val vs = (p -- neighbors(u)).iterator + Iterator.unfold((p, x))((p, x) => // foldLeftFlatMap + vs.nextOption().map(v => + (bronKerbosch(r + v, p intersect neighbors(v), x intersect neighbors(v)), (p - v, x + v)) + ) + ).flatten + } + } + + bronKerbosch(Set.empty, neighbors.keySet, Set.empty) + } + + // TODO: would this be slower than direct implementation below? + /*def maximumClique[A](neighbors: Map[A, Set[A]]): Set[A] = + maximalCliques(neighbors).maxBy(_.size)*/ + // moved from 2018 day 23 def maximumClique[A](neighbors: Map[A, Set[A]]): Set[A] = { var best: Set[A] = Set.empty From 9c202dd73bfc04cab77dbb4a79d7b48608c29b8a Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 23 Dec 2024 16:49:32 +0200 Subject: [PATCH 12/99] Clean up 2024 day 23 --- .../eu/sim642/adventofcode2024/Day23.scala | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day23.scala b/src/main/scala/eu/sim642/adventofcode2024/Day23.scala index e5435c8a..e9e1ec97 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day23.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day23.scala @@ -7,9 +7,11 @@ object Day23 { type Computer = String type Edge = (Computer, Computer) - def find3Cliques(edges: Set[Edge]): Set[Set[Computer]] = { - val neighbors = (edges ++ edges.map(_.swap)).groupMap(_._1)(_._2) + def edges2neighbors(edges: Set[Edge]): Map[Computer, Set[Computer]] = + (edges ++ edges.map(_.swap)).groupMap(_._1)(_._2) + def find3Cliques(edges: Set[Edge]): Set[Set[Computer]] = { + val neighbors = edges2neighbors(edges) for { (from, to) <- edges third <- neighbors(from) & neighbors(to) @@ -18,15 +20,11 @@ object Day23 { def count3CliquesT(edges: Set[Edge]): Int = find3Cliques(edges).count(_.exists(_.startsWith("t"))) - def maximumClique(edges: Set[Edge]): Set[Computer] = { - val neighbors = (edges ++ edges.map(_.swap)).groupMap(_._1)(_._2) - BronKerbosch.maximumClique(neighbors) - } + def maximumClique(edges: Set[Edge]): Set[Computer] = + BronKerbosch.maximumClique(edges2neighbors(edges)) - def lanPartyPassword(edges: Set[Edge]): String = { - val clique = maximumClique(edges) - clique.toSeq.sorted.mkString(",") - } + def lanPartyPassword(edges: Set[Edge]): String = + maximumClique(edges).toSeq.sorted.mkString(",") def parseEdge(s: String): Edge = s match { case s"$from-$to" => (from, to) From 15807509460e85f52c1679f87f44fd0a0ff38048 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 23 Dec 2024 17:01:52 +0200 Subject: [PATCH 13/99] Use bitwise operations in 2024 day 22 --- src/main/scala/eu/sim642/adventofcode2024/Day22.scala | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day22.scala b/src/main/scala/eu/sim642/adventofcode2024/Day22.scala index a263715a..83166586 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day22.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day22.scala @@ -7,12 +7,12 @@ object Day22 { type Secret = Long def mix(secret: Secret, value: Secret): Secret = value ^ secret - def prune(secret: Secret): Secret = secret % 16777216 // TODO: bitwise + def prune(secret: Secret): Secret = secret & 0xFFFFFF // % 16777216 def nextSecret(secret: Secret): Secret = { - val secret1 = prune(mix(secret, secret * 64)) - val secret2 = prune(mix(secret1, secret1 / 32)) - prune(mix(secret2, secret2 * 2048)) + val secret1 = prune(mix(secret, secret << 6)) // * 64 + val secret2 = mix(secret1, secret1 >> 5) // / 32, no prune needed after right shift + prune(mix(secret2, secret2 << 11)) // * 2048 } def secretIterator(initialSecret: Secret): Iterator[Secret] = From 2392b2de0ae5ec5c3e20cfca8ca0e53a0d331e0b Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 24 Dec 2024 08:48:43 +0200 Subject: [PATCH 14/99] Solve 2024 day 24 part 1 --- .../eu/sim642/adventofcode2024/day24.txt | 313 ++++++++++++++++++ .../eu/sim642/adventofcode2024/Day24.scala | 71 ++++ .../sim642/adventofcode2024/Day24Test.scala | 77 +++++ 3 files changed, 461 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2024/day24.txt create mode 100644 src/main/scala/eu/sim642/adventofcode2024/Day24.scala create mode 100644 src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala diff --git a/src/main/resources/eu/sim642/adventofcode2024/day24.txt b/src/main/resources/eu/sim642/adventofcode2024/day24.txt new file mode 100644 index 00000000..3c2b9548 --- /dev/null +++ b/src/main/resources/eu/sim642/adventofcode2024/day24.txt @@ -0,0 +1,313 @@ +x00: 1 +x01: 1 +x02: 0 +x03: 0 +x04: 0 +x05: 1 +x06: 0 +x07: 1 +x08: 1 +x09: 0 +x10: 1 +x11: 0 +x12: 0 +x13: 0 +x14: 1 +x15: 1 +x16: 1 +x17: 0 +x18: 0 +x19: 0 +x20: 1 +x21: 0 +x22: 1 +x23: 0 +x24: 0 +x25: 0 +x26: 0 +x27: 1 +x28: 0 +x29: 1 +x30: 0 +x31: 0 +x32: 1 +x33: 1 +x34: 1 +x35: 0 +x36: 0 +x37: 0 +x38: 1 +x39: 1 +x40: 1 +x41: 1 +x42: 0 +x43: 0 +x44: 1 +y00: 1 +y01: 0 +y02: 1 +y03: 1 +y04: 0 +y05: 0 +y06: 1 +y07: 1 +y08: 0 +y09: 1 +y10: 1 +y11: 1 +y12: 1 +y13: 0 +y14: 1 +y15: 0 +y16: 0 +y17: 1 +y18: 0 +y19: 1 +y20: 0 +y21: 1 +y22: 1 +y23: 1 +y24: 0 +y25: 1 +y26: 1 +y27: 0 +y28: 1 +y29: 1 +y30: 0 +y31: 1 +y32: 0 +y33: 0 +y34: 0 +y35: 1 +y36: 1 +y37: 1 +y38: 1 +y39: 1 +y40: 0 +y41: 1 +y42: 0 +y43: 1 +y44: 1 + +x23 AND y23 -> mhq +dbf XOR dsb -> z35 +x41 AND y41 -> qss +kbv AND ctw -> qhg +djs OR tgk -> ccp +nmw AND bgp -> bcr +jns OR npn -> jbv +y29 AND x29 -> tjt +y17 AND x17 -> nhh +kmm AND ptk -> vnr +hbr AND qfp -> mjr +qfk AND pvj -> ndp +tvb XOR jhd -> z25 +y29 XOR x29 -> wft +rqd AND cns -> grb +jbv AND kjg -> vjg +tvm XOR pkw -> z38 +vwd AND kvv -> mgw +nmw XOR bgp -> z02 +cdc OR stq -> z21 +x16 XOR y16 -> mft +x37 XOR y37 -> hbr +x24 XOR y24 -> cns +y40 XOR x40 -> pgc +ccd OR cst -> cbk +fht XOR ddw -> z20 +wft AND nnq -> stm +srk AND sjm -> fwg +y06 AND x06 -> cnm +gqg XOR pmv -> z07 +ndp OR nfq -> rgv +bsm OR vsc -> fjn +x15 XOR y15 -> srk +bwv XOR vbq -> z42 +kbv XOR ctw -> z31 +x10 XOR y10 -> htc +x08 XOR y08 -> knh +fgc AND dvm -> nfn +y03 AND x03 -> ssj +x26 XOR y26 -> spf +y02 AND x02 -> psw +x36 XOR y36 -> fcf +ptj OR dtg -> spg +stm OR tjt -> gsj +mmw XOR ncf -> z23 +y26 AND x26 -> csh +rrj AND mft -> tnt +x05 XOR y05 -> chs +x16 AND y16 -> khn +nqm AND fmf -> tgq +wft XOR nnq -> z29 +y13 AND x13 -> ggg +rcb OR khg -> mfp +y28 AND x28 -> wgd +csf AND bck -> qsg +x31 XOR y31 -> kbv +rrj XOR mft -> z16 +hhg AND ccp -> msp +y00 XOR x00 -> z00 +x25 XOR y25 -> khg +x42 AND y42 -> djs +ggg OR hvg -> csf +pps XOR wdg -> vdc +y04 XOR x04 -> pvj +qtg AND knh -> ccd +x27 AND y27 -> jns +jdk OR pmr -> spk +nhm XOR jmr -> z18 +fpk AND dfh -> ccr +x06 XOR y06 -> bgq +x38 AND y38 -> dcc +x22 XOR y22 -> jkq +vbq AND bwv -> tgk +x14 XOR y14 -> bck +fjn AND htc -> dtg +kfd XOR rtg -> z19 +bvk OR khh -> nmw +x34 XOR y34 -> ptk +mmw AND ncf -> rkf +y11 AND x11 -> rvg +wgd OR vjg -> nnq +qss OR wtt -> bwv +dmb OR crv -> ddw +y08 AND x08 -> cst +nhh OR tgq -> jmr +cpt XOR fqc -> z32 +tnt OR khn -> fmf +fbk AND tcq -> hvg +spq XOR gpk -> z01 +x02 XOR y02 -> bgp +x20 AND y20 -> fct +x36 AND y36 -> jbq +x12 AND y12 -> z12 +mfp XOR spf -> z26 +spg XOR hhm -> z11 +y32 AND x32 -> rjq +y04 AND x04 -> nfq +pkj OR msp -> kvv +tvc OR dcc -> dvm +vnr OR krb -> dbf +fmf XOR nqm -> z17 +rtg AND kfd -> dmb +fvh XOR pgc -> z40 +fcf XOR spk -> z36 +pvc OR gst -> kmm +cbk AND nbm -> vsc +x09 AND y09 -> bsm +x07 XOR y07 -> gqg +ptk XOR kmm -> z34 +x28 XOR y28 -> kjg +dbm OR jft -> qtg +jbr AND wcs -> z33 +y42 XOR x42 -> vbq +y00 AND x00 -> spq +y19 XOR x19 -> kfd +tbn OR grb -> jhd +kvv XOR vwd -> z44 +wcs XOR jbr -> gst +srk XOR sjm -> z15 +y39 AND x39 -> cbf +bgq XOR wdh -> z06 +bbn AND rsc -> cdc +y18 XOR x18 -> nhm +tvm AND pkw -> tvc +x23 XOR y23 -> ncf +x19 AND y19 -> crv +qhg OR gnc -> fqc +jbv XOR kjg -> z28 +y05 AND x05 -> nph +x32 XOR y32 -> cpt +x31 AND y31 -> gnc +ccp XOR hhg -> z43 +x15 AND y15 -> gtf +jmr AND nhm -> ptd +x10 AND y10 -> ptj +bgq AND wdh -> dgh +ftw XOR gsj -> z30 +x44 AND y44 -> bds +fjn XOR htc -> z10 +y43 AND x43 -> pkj +y30 AND x30 -> nmj +tvb AND jhd -> rcb +x40 AND y40 -> gdm +mgw OR bds -> z45 +fdv AND dfs -> wtt +rkf OR mhq -> rqd +pvj XOR qfk -> z04 +pmv AND gqg -> dbm +x21 XOR y21 -> bbn +x38 XOR y38 -> tvm +mjr OR kpb -> pkw +jbq OR vmj -> qfp +jkq XOR nhn -> z22 +qfn OR fct -> rsc +x30 XOR y30 -> ftw +y35 XOR x35 -> dsb +y24 AND x24 -> tbn +fcf AND spk -> vmj +cnm OR dgh -> pmv +x27 XOR y27 -> mcv +chs XOR rgv -> z05 +vdc OR kcp -> fbk +y39 XOR x39 -> fgc +x13 XOR y13 -> tcq +ssj OR ccr -> qfk +fwg OR gtf -> rrj +knh XOR qtg -> z08 +fqc AND cpt -> nfh +y17 XOR x17 -> nqm +hbr XOR qfp -> z37 +y22 AND x22 -> nrq +y01 XOR x01 -> gpk +jhv OR nph -> wdh +dfs XOR fdv -> z41 +gqb OR csh -> mbp +dvm XOR fgc -> z39 +y03 XOR x03 -> fpk +mfp AND spf -> gqb +x44 XOR y44 -> vwd +gpk AND spq -> bvk +x21 AND y21 -> stq +cbf OR nfn -> fvh +spg AND hhm -> wvv +cns XOR rqd -> z24 +rjq OR nfh -> wcs +mcv AND mbp -> npn +wdg AND pps -> kcp +nrq OR vkg -> mmw +x33 AND y33 -> pvc +x20 XOR y20 -> fht +y43 XOR x43 -> hhg +dfh XOR fpk -> z03 +fbk XOR tcq -> z13 +x09 XOR y09 -> nbm +pwp OR nmj -> ctw +y25 AND x25 -> tvb +y34 AND x34 -> krb +x11 XOR y11 -> hhm +hdq OR gdm -> fdv +mcv XOR mbp -> z27 +nbm XOR cbk -> z09 +fvh AND pgc -> hdq +jkq AND nhn -> vkg +dwt OR qsg -> sjm +dbf AND dsb -> pmr +rsc XOR bbn -> nhn +y14 AND x14 -> dwt +x35 AND y35 -> jdk +x41 XOR y41 -> dfs +y37 AND x37 -> kpb +bck XOR csf -> z14 +y07 AND x07 -> jft +sdp OR ptd -> rtg +y01 AND x01 -> khh +bcr OR psw -> dfh +chs AND rgv -> jhv +y18 AND x18 -> sdp +ddw AND fht -> qfn +x33 XOR y33 -> jbr +gsj AND ftw -> pwp +x12 XOR y12 -> pps +rvg OR wvv -> wdg diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day24.scala b/src/main/scala/eu/sim642/adventofcode2024/Day24.scala new file mode 100644 index 00000000..0b9ca2bb --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcode2024/Day24.scala @@ -0,0 +1,71 @@ +package eu.sim642.adventofcode2024 + +import scala.collection.mutable + +object Day24 { + + enum Op { + case And + case Or + case Xor + } + + enum Wire { + case Input(value: Boolean) + case Gate(lhs: String, op: Op, rhs: String) + } + + type Circuit = Map[String, Wire] + + def getZValue(circuit: Circuit): Long = { + + val memo = mutable.Map.empty[String, Boolean] + + def evalName(name: String): Boolean = + memo.getOrElseUpdate(name, evalWire(circuit(name))) + + def evalWire(wire: Wire): Boolean = wire match { + case Wire.Input(value) => value + case Wire.Gate(lhs, op, rhs) => + val left = evalName(lhs) + val right = evalName(rhs) + op match { + case Op.And => left && right + case Op.Or => left || right + case Op.Xor => left != right + } + } + + circuit.keys + .filter(_.startsWith("z")) + .toSeq + .sorted + .foldRight(0L)({ case (zName, acc) => + acc << 1 | (if (evalName(zName)) 1 else 0) + }) + } + + def parseInput(s: String): (String, Wire.Input) = s match { + case s"$name: 0" => name -> Wire.Input(false) + case s"$name: 1" => name -> Wire.Input(true) + } + + def parseGate(s: String): (String, Wire.Gate) = s match { + case s"$lhs AND $rhs -> $name" => name ->Wire.Gate(lhs, Op.And, rhs) + case s"$lhs OR $rhs -> $name" => name -> Wire.Gate(lhs, Op.Or, rhs) + case s"$lhs XOR $rhs -> $name" => name -> Wire.Gate(lhs, Op.Xor, rhs) + } + + def parseCircuit(input: String): Circuit = input match { + case s"$inputs\n\n$gates" => + val inputMap = inputs.linesIterator.map(parseInput).toMap + val gateMap = gates.linesIterator.map(parseGate).toMap + inputMap ++ gateMap + } + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day24.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(getZValue(parseCircuit(input))) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala new file mode 100644 index 00000000..18c6f723 --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala @@ -0,0 +1,77 @@ +package eu.sim642.adventofcode2024 + +import Day24._ +import org.scalatest.funsuite.AnyFunSuite + +class Day24Test extends AnyFunSuite { + + val exampleInput = + """x00: 1 + |x01: 1 + |x02: 1 + |y00: 0 + |y01: 1 + |y02: 0 + | + |x00 AND y00 -> z00 + |x01 XOR y01 -> z01 + |x02 OR y02 -> z02""".stripMargin + + val exampleInput2 = + """x00: 1 + |x01: 0 + |x02: 1 + |x03: 1 + |x04: 0 + |y00: 1 + |y01: 1 + |y02: 1 + |y03: 1 + |y04: 1 + | + |ntg XOR fgs -> mjb + |y02 OR x01 -> tnw + |kwq OR kpj -> z05 + |x00 OR x03 -> fst + |tgd XOR rvg -> z01 + |vdt OR tnw -> bfw + |bfw AND frj -> z10 + |ffh OR nrd -> bqk + |y00 AND y03 -> djm + |y03 OR y00 -> psh + |bqk OR frj -> z08 + |tnw OR fst -> frj + |gnj AND tgd -> z11 + |bfw XOR mjb -> z00 + |x03 OR x00 -> vdt + |gnj AND wpb -> z02 + |x04 AND y00 -> kjc + |djm OR pbm -> qhw + |nrd AND vdt -> hwm + |kjc AND fst -> rvg + |y04 OR y02 -> fgs + |y01 AND x02 -> pbm + |ntg OR kjc -> kwq + |psh XOR fgs -> tgd + |qhw XOR tgd -> z09 + |pbm OR djm -> kpj + |x03 XOR y03 -> ffh + |x00 XOR y04 -> ntg + |bfw OR bqk -> z06 + |nrd XOR fgs -> wpb + |frj XOR qhw -> z04 + |bqk OR frj -> z07 + |y03 OR x01 -> nrd + |hwm AND bqk -> z03 + |tgd XOR rvg -> z12 + |tnw OR pbm -> gnj""".stripMargin + + test("Part 1 examples") { + assert(getZValue(parseCircuit(exampleInput)) == 4) + assert(getZValue(parseCircuit(exampleInput2)) == 2024) + } + + test("Part 1 input answer") { + assert(getZValue(parseCircuit(input)) == 51410244478064L) + } +} From 62912a6c108f8cadc605b62f819a8889ff6ad251 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 24 Dec 2024 09:41:49 +0200 Subject: [PATCH 15/99] Solve 2024 day 24 part 2 manually --- .../eu/sim642/adventofcode2024/Day24.scala | 43 ++++++++++++++++++- 1 file changed, 42 insertions(+), 1 deletion(-) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day24.scala b/src/main/scala/eu/sim642/adventofcode2024/Day24.scala index 0b9ca2bb..cd5733dd 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day24.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day24.scala @@ -45,6 +45,21 @@ object Day24 { }) } + def swap(circuit: Circuit, name1: String, name2: String): Circuit = + circuit + (name1 -> circuit(name2)) + (name2 -> circuit(name1)) + + def changeInput(circuit: Circuit, prefix: String, value: Long): Circuit = { + val (a, b) = circuit.keys + .filter(_.startsWith(prefix)) + .toSeq + .sorted + .foldLeft((circuit, value))({ case ((circuit, value), prefixName) => + (circuit + (prefixName -> Wire.Input((value & 1) == 1L)), value >> 1) + }) + assert(b == 0) + a + } + def parseInput(s: String): (String, Wire.Input) = s match { case s"$name: 0" => name -> Wire.Input(false) case s"$name: 1" => name -> Wire.Input(true) @@ -63,9 +78,35 @@ object Day24 { inputMap ++ gateMap } + def printCircuitDot(circuit: Circuit): Unit = { + println("digraph circuit {") + for ((name, wire) <- circuit) { + wire match { + case Wire.Input(value) => + println(s" $name;") + case Wire.Gate(lhs, op, rhs) => + println(s" $name [label=\"$name $op\"];") + println(s" $lhs -> $name;") + println(s" $rhs -> $name;") + } + } + println("}") + } + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day24.txt")).mkString.trim def main(args: Array[String]): Unit = { - println(getZValue(parseCircuit(input))) + val circuit = parseCircuit(input) + println(getZValue(circuit)) + val circuit2 = swap(swap(swap(swap(circuit, "z21", "nhn"), "tvb", "khg"), "z33", "gst"), "z12", "vdc") + printCircuitDot(circuit2) + println(getZValue(circuit2)) + println("51401618891888") + + val circuit3 = changeInput(changeInput(circuit2, "x", 0), "asdasd", 0) + println(getZValue(circuit3)) + + println(Seq("z21", "nhn", "tvb", "khg", "z33", "gst", "z12", "vdc").sorted.mkString(",")) + // part 2: gst,khg,nhn,tvb,vdc,z12,z21,z33 - correct } } From 5b54798f95ea627292072265092977d99d5cf58f Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 24 Dec 2024 10:57:59 +0200 Subject: [PATCH 16/99] Create Circuit class in 2024 day 24 --- .../eu/sim642/adventofcode2024/Day24.scala | 90 ++++++++++--------- .../sim642/adventofcode2024/Day24Test.scala | 6 +- 2 files changed, 49 insertions(+), 47 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day24.scala b/src/main/scala/eu/sim642/adventofcode2024/Day24.scala index cd5733dd..fcb7ef56 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day24.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day24.scala @@ -15,49 +15,51 @@ object Day24 { case Gate(lhs: String, op: Op, rhs: String) } - type Circuit = Map[String, Wire] + case class Circuit(wireMap: Map[String, Wire]) { + def zValue: Long = { + val memo = mutable.Map.empty[String, Boolean] - def getZValue(circuit: Circuit): Long = { + def evalName(name: String): Boolean = + memo.getOrElseUpdate(name, evalWire(wireMap(name))) - val memo = mutable.Map.empty[String, Boolean] - - def evalName(name: String): Boolean = - memo.getOrElseUpdate(name, evalWire(circuit(name))) + def evalWire(wire: Wire): Boolean = wire match { + case Wire.Input(value) => value + case Wire.Gate(lhs, op, rhs) => + val left = evalName(lhs) + val right = evalName(rhs) + op match { + case Op.And => left && right + case Op.Or => left || right + case Op.Xor => left != right + } + } - def evalWire(wire: Wire): Boolean = wire match { - case Wire.Input(value) => value - case Wire.Gate(lhs, op, rhs) => - val left = evalName(lhs) - val right = evalName(rhs) - op match { - case Op.And => left && right - case Op.Or => left || right - case Op.Xor => left != right - } + wireMap.keys + .filter(_.startsWith("z")) + .toSeq + .sorted + .foldRight(0L)({ case (zName, acc) => + acc << 1 | (if (evalName(zName)) 1 else 0) + }) } - circuit.keys - .filter(_.startsWith("z")) - .toSeq - .sorted - .foldRight(0L)({ case (zName, acc) => - acc << 1 | (if (evalName(zName)) 1 else 0) - }) - } + def swapped(name1: String, name2: String): Circuit = + Circuit(wireMap + (name1 -> wireMap(name2)) + (name2 -> wireMap(name1))) + + private def withInputValue(inputPrefix: String, value: Long): Circuit = { + val (newCircuit, remainingValue) = wireMap.keys + .filter(_.startsWith(inputPrefix)) + .toSeq + .sorted + .foldLeft((wireMap, value))({ case ((circuit, value), prefixName) => + (circuit + (prefixName -> Wire.Input((value & 1) == 1L)), value >> 1) + }) + assert(remainingValue == 0) + Circuit(newCircuit) + } - def swap(circuit: Circuit, name1: String, name2: String): Circuit = - circuit + (name1 -> circuit(name2)) + (name2 -> circuit(name1)) - - def changeInput(circuit: Circuit, prefix: String, value: Long): Circuit = { - val (a, b) = circuit.keys - .filter(_.startsWith(prefix)) - .toSeq - .sorted - .foldLeft((circuit, value))({ case ((circuit, value), prefixName) => - (circuit + (prefixName -> Wire.Input((value & 1) == 1L)), value >> 1) - }) - assert(b == 0) - a + def withXValue(value: Long): Circuit = withInputValue("x", value) + def withYValue(value: Long): Circuit = withInputValue("y", value) } def parseInput(s: String): (String, Wire.Input) = s match { @@ -75,12 +77,12 @@ object Day24 { case s"$inputs\n\n$gates" => val inputMap = inputs.linesIterator.map(parseInput).toMap val gateMap = gates.linesIterator.map(parseGate).toMap - inputMap ++ gateMap + Circuit(inputMap ++ gateMap) } def printCircuitDot(circuit: Circuit): Unit = { println("digraph circuit {") - for ((name, wire) <- circuit) { + for ((name, wire) <- circuit.wireMap) { wire match { case Wire.Input(value) => println(s" $name;") @@ -97,14 +99,14 @@ object Day24 { def main(args: Array[String]): Unit = { val circuit = parseCircuit(input) - println(getZValue(circuit)) - val circuit2 = swap(swap(swap(swap(circuit, "z21", "nhn"), "tvb", "khg"), "z33", "gst"), "z12", "vdc") + println(circuit.zValue) + val circuit2 = circuit.swapped("z21", "nhn").swapped("tvb", "khg").swapped("z33", "gst").swapped("z12", "vdc") printCircuitDot(circuit2) - println(getZValue(circuit2)) + println(circuit2.zValue) println("51401618891888") - val circuit3 = changeInput(changeInput(circuit2, "x", 0), "asdasd", 0) - println(getZValue(circuit3)) + val circuit3 = circuit2.withXValue(0) + println(circuit3.zValue) println(Seq("z21", "nhn", "tvb", "khg", "z33", "gst", "z12", "vdc").sorted.mkString(",")) // part 2: gst,khg,nhn,tvb,vdc,z12,z21,z33 - correct diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala index 18c6f723..cc243920 100644 --- a/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala @@ -67,11 +67,11 @@ class Day24Test extends AnyFunSuite { |tnw OR pbm -> gnj""".stripMargin test("Part 1 examples") { - assert(getZValue(parseCircuit(exampleInput)) == 4) - assert(getZValue(parseCircuit(exampleInput2)) == 2024) + assert(parseCircuit(exampleInput).zValue == 4) + assert(parseCircuit(exampleInput2).zValue == 2024) } test("Part 1 input answer") { - assert(getZValue(parseCircuit(input)) == 51410244478064L) + assert(parseCircuit(input).zValue == 51410244478064L) } } From 659e71ac250ba3adc003e82be418d7d26aedc3c0 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 24 Dec 2024 12:26:17 +0200 Subject: [PATCH 17/99] Solve 2024 day 24 part 2 automatically --- .../eu/sim642/adventofcode2024/Day24.scala | 111 ++++++++++++++++-- .../sim642/adventofcode2024/Day24Test.scala | 4 + 2 files changed, 103 insertions(+), 12 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day24.scala b/src/main/scala/eu/sim642/adventofcode2024/Day24.scala index fcb7ef56..e7f8e6c8 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day24.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day24.scala @@ -1,5 +1,6 @@ package eu.sim642.adventofcode2024 +import scala.annotation.tailrec import scala.collection.mutable object Day24 { @@ -15,18 +16,23 @@ object Day24 { case Gate(lhs: String, op: Op, rhs: String) } + class CyclicCircuit extends RuntimeException + case class Circuit(wireMap: Map[String, Wire]) { def zValue: Long = { val memo = mutable.Map.empty[String, Boolean] - def evalName(name: String): Boolean = - memo.getOrElseUpdate(name, evalWire(wireMap(name))) + def evalName(name: String, called: Set[String]): Boolean = + if (called.contains(name)) + throw new CyclicCircuit + else + memo.getOrElseUpdate(name, evalWire(wireMap(name), called + name)) - def evalWire(wire: Wire): Boolean = wire match { + def evalWire(wire: Wire, called: Set[String]): Boolean = wire match { case Wire.Input(value) => value case Wire.Gate(lhs, op, rhs) => - val left = evalName(lhs) - val right = evalName(rhs) + val left = evalName(lhs, called) + val right = evalName(rhs, called) op match { case Op.And => left && right case Op.Or => left || right @@ -39,10 +45,30 @@ object Day24 { .toSeq .sorted .foldRight(0L)({ case (zName, acc) => - acc << 1 | (if (evalName(zName)) 1 else 0) + acc << 1 | (if (evalName(zName, Set.empty)) 1 else 0) }) } + def dependencies(name: String): Set[String] = { + val memo = mutable.Map.empty[String, Set[String]] + + def evalName(name: String, called: Set[String]): Set[String] = + if (called.contains(name)) + throw new CyclicCircuit + else + memo.getOrElseUpdate(name, evalWire(wireMap(name), called + name) + name) + + def evalWire(wire: Wire, called: Set[String]): Set[String] = wire match { + case Wire.Input(value) => Set.empty + case Wire.Gate(lhs, op, rhs) => + val left = evalName(lhs, called) + val right = evalName(rhs, called) + left ++ right + } + + evalName(name, Set.empty) + } + def swapped(name1: String, name2: String): Circuit = Circuit(wireMap + (name1 -> wireMap(name2)) + (name2 -> wireMap(name1))) @@ -60,15 +86,75 @@ object Day24 { def withXValue(value: Long): Circuit = withInputValue("x", value) def withYValue(value: Long): Circuit = withInputValue("y", value) + + def add(xValue: Long, yValue: Long): Long = + withXValue(xValue).withYValue(yValue).zValue } + def findWrongBits(circuit: Circuit): Seq[(String, String)] = { + + def isCorrect(circuit: Circuit, i: Int): Boolean = { + (for { + xBit <- 0 to 3 + yBit <- 0 to 3 + xValue = xBit.toLong << i >> 1 + yValue = yBit.toLong << i >> 1 + //if (try {circuit.dependencies("z45"); true} catch {case e: CyclicCircuit => false}) + } yield try {circuit.add(xValue, yValue) == xValue + yValue} catch {case e: CyclicCircuit => false}).forall(identity) + } + + def helper(circuit: Circuit, i: Int, acc: Seq[(String, String)]): Seq[Seq[(String, String)]] = { + if (acc.sizeIs > 4) + Seq.empty + else if (i > 44) + Seq(acc) + else if (isCorrect(circuit, i)) + helper(circuit, i + 1, acc) + else { + println(i) + val depsPrev = circuit.dependencies(s"z${i - 1}") + val deps = circuit.dependencies(s"z$i") + val depsNext = circuit.dependencies(s"z${i + 1}") + val depsNext2 = circuit.dependencies(s"z${i + 2}") + val wrong1 = ((deps -- depsPrev) ++ (depsNext -- deps)).filterNot(_.startsWith("x")).filterNot(_.startsWith("y")) + val wrong2 = (depsNext2 -- depsPrev).filterNot(_.startsWith("x")).filterNot(_.startsWith("y")) + println(wrong1) + println(wrong2) + val swaps = + for { + name1 <- wrong1 + name2 <- wrong2 + minName = if (name1 < name2) name1 else name2 + maxName = if (name1 < name2) name2 else name1 + } yield (minName, maxName) + for { + (name1, name2) <- swaps.toSeq + //name2 <- wrong2 + newCircuit = circuit.swapped(name1, name2) + //() = println((name1, name2)) + if isCorrect(newCircuit, i - 1) + if isCorrect(newCircuit, i) + swap = (name1, name2) + rest <- helper(newCircuit, i + 1, acc :+ swap) + } yield rest + } + } + + val all = helper(circuit, 0, Seq.empty) + all.foreach(println) + all.head + } + + def findWrongBitsString(circuit: Circuit): String = + findWrongBits(circuit).flatMap({ case (a, b) => Seq(a, b)}).sorted.mkString(",") + def parseInput(s: String): (String, Wire.Input) = s match { case s"$name: 0" => name -> Wire.Input(false) case s"$name: 1" => name -> Wire.Input(true) } def parseGate(s: String): (String, Wire.Gate) = s match { - case s"$lhs AND $rhs -> $name" => name ->Wire.Gate(lhs, Op.And, rhs) + case s"$lhs AND $rhs -> $name" => name -> Wire.Gate(lhs, Op.And, rhs) case s"$lhs OR $rhs -> $name" => name -> Wire.Gate(lhs, Op.Or, rhs) case s"$lhs XOR $rhs -> $name" => name -> Wire.Gate(lhs, Op.Xor, rhs) } @@ -100,15 +186,16 @@ object Day24 { def main(args: Array[String]): Unit = { val circuit = parseCircuit(input) println(circuit.zValue) + findWrongBits(circuit) val circuit2 = circuit.swapped("z21", "nhn").swapped("tvb", "khg").swapped("z33", "gst").swapped("z12", "vdc") - printCircuitDot(circuit2) - println(circuit2.zValue) - println("51401618891888") + //printCircuitDot(circuit2) + //println(circuit2.zValue) + //println("51401618891888") val circuit3 = circuit2.withXValue(0) - println(circuit3.zValue) + //println(circuit3.zValue) - println(Seq("z21", "nhn", "tvb", "khg", "z33", "gst", "z12", "vdc").sorted.mkString(",")) + //println(Seq("z21", "nhn", "tvb", "khg", "z33", "gst", "z12", "vdc").sorted.mkString(",")) // part 2: gst,khg,nhn,tvb,vdc,z12,z21,z33 - correct } } diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala index cc243920..99b11416 100644 --- a/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala @@ -74,4 +74,8 @@ class Day24Test extends AnyFunSuite { test("Part 1 input answer") { assert(parseCircuit(input).zValue == 51410244478064L) } + + test("Part 2 input answer") { + assert(findWrongBitsString(parseCircuit(input)) == "gst,khg,nhn,tvb,vdc,z12,z21,z33") + } } From 7efddfd87270f329f52b51320eae49a2a622bee4 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 24 Dec 2024 12:42:39 +0200 Subject: [PATCH 18/99] Clean up 2024 day 24 part 2 --- .../eu/sim642/adventofcode2024/Day24.scala | 64 ++++++++----------- .../sim642/adventofcode2024/Day24Test.scala | 2 +- 2 files changed, 28 insertions(+), 38 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day24.scala b/src/main/scala/eu/sim642/adventofcode2024/Day24.scala index e7f8e6c8..696a8efd 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day24.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day24.scala @@ -1,8 +1,9 @@ package eu.sim642.adventofcode2024 -import scala.annotation.tailrec import scala.collection.mutable +import eu.sim642.adventofcodelib.IteratorImplicits._ + object Day24 { enum Op { @@ -16,7 +17,11 @@ object Day24 { case Gate(lhs: String, op: Op, rhs: String) } - class CyclicCircuit extends RuntimeException + /** + * Exception to indicate cyclic circuit evaluation. + * When trying for swaps in part 2, cycles may be introduced, which otherwise (slowly) lead to StackOverflowError. + */ + class CircuitCycleException extends RuntimeException case class Circuit(wireMap: Map[String, Wire]) { def zValue: Long = { @@ -24,7 +29,7 @@ object Day24 { def evalName(name: String, called: Set[String]): Boolean = if (called.contains(name)) - throw new CyclicCircuit + throw new CircuitCycleException else memo.getOrElseUpdate(name, evalWire(wireMap(name), called + name)) @@ -54,7 +59,7 @@ object Day24 { def evalName(name: String, called: Set[String]): Set[String] = if (called.contains(name)) - throw new CyclicCircuit + throw new CircuitCycleException else memo.getOrElseUpdate(name, evalWire(wireMap(name), called + name) + name) @@ -91,62 +96,57 @@ object Day24 { withXValue(xValue).withYValue(yValue).zValue } - def findWrongBits(circuit: Circuit): Seq[(String, String)] = { - + def findWireSwaps(circuit: Circuit): Seq[(String, String)] = { def isCorrect(circuit: Circuit, i: Int): Boolean = { (for { + // must also check previous bit to account for incoming carry xBit <- 0 to 3 yBit <- 0 to 3 xValue = xBit.toLong << i >> 1 yValue = yBit.toLong << i >> 1 - //if (try {circuit.dependencies("z45"); true} catch {case e: CyclicCircuit => false}) - } yield try {circuit.add(xValue, yValue) == xValue + yValue} catch {case e: CyclicCircuit => false}).forall(identity) + } yield { + try circuit.add(xValue, yValue) == xValue + yValue + catch case _: CircuitCycleException => false + }).forall(identity) } - def helper(circuit: Circuit, i: Int, acc: Seq[(String, String)]): Seq[Seq[(String, String)]] = { + def helper(circuit: Circuit, i: Int, acc: List[(String, String)]): Iterator[List[(String, String)]] = { if (acc.sizeIs > 4) - Seq.empty + Iterator.empty else if (i > 44) - Seq(acc) + Iterator.single(acc) else if (isCorrect(circuit, i)) helper(circuit, i + 1, acc) else { - println(i) val depsPrev = circuit.dependencies(s"z${i - 1}") val deps = circuit.dependencies(s"z$i") val depsNext = circuit.dependencies(s"z${i + 1}") val depsNext2 = circuit.dependencies(s"z${i + 2}") val wrong1 = ((deps -- depsPrev) ++ (depsNext -- deps)).filterNot(_.startsWith("x")).filterNot(_.startsWith("y")) val wrong2 = (depsNext2 -- depsPrev).filterNot(_.startsWith("x")).filterNot(_.startsWith("y")) - println(wrong1) - println(wrong2) val swaps = for { name1 <- wrong1 name2 <- wrong2 + // order names in swap to avoid duplicate checking minName = if (name1 < name2) name1 else name2 maxName = if (name1 < name2) name2 else name1 } yield (minName, maxName) for { - (name1, name2) <- swaps.toSeq - //name2 <- wrong2 + swap@(name1, name2) <- swaps.iterator newCircuit = circuit.swapped(name1, name2) - //() = println((name1, name2)) - if isCorrect(newCircuit, i - 1) if isCorrect(newCircuit, i) - swap = (name1, name2) - rest <- helper(newCircuit, i + 1, acc :+ swap) - } yield rest + newAcc <- helper(newCircuit, i + 1, swap :: acc) + } yield newAcc } } - val all = helper(circuit, 0, Seq.empty) - all.foreach(println) - all.head + val swapss = helper(circuit, 0, Nil) + swapss.head } - def findWrongBitsString(circuit: Circuit): String = - findWrongBits(circuit).flatMap({ case (a, b) => Seq(a, b)}).sorted.mkString(",") + def findWireSwapsString(circuit: Circuit): String = + findWireSwaps(circuit).flatMap({ case (name1, name2) => Seq(name1, name2) }).sorted.mkString(",") def parseInput(s: String): (String, Wire.Input) = s match { case s"$name: 0" => name -> Wire.Input(false) @@ -186,16 +186,6 @@ object Day24 { def main(args: Array[String]): Unit = { val circuit = parseCircuit(input) println(circuit.zValue) - findWrongBits(circuit) - val circuit2 = circuit.swapped("z21", "nhn").swapped("tvb", "khg").swapped("z33", "gst").swapped("z12", "vdc") - //printCircuitDot(circuit2) - //println(circuit2.zValue) - //println("51401618891888") - - val circuit3 = circuit2.withXValue(0) - //println(circuit3.zValue) - - //println(Seq("z21", "nhn", "tvb", "khg", "z33", "gst", "z12", "vdc").sorted.mkString(",")) - // part 2: gst,khg,nhn,tvb,vdc,z12,z21,z33 - correct + println(findWireSwapsString(circuit)) } } diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala index 99b11416..e08de7b2 100644 --- a/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2024/Day24Test.scala @@ -76,6 +76,6 @@ class Day24Test extends AnyFunSuite { } test("Part 2 input answer") { - assert(findWrongBitsString(parseCircuit(input)) == "gst,khg,nhn,tvb,vdc,z12,z21,z33") + assert(findWireSwapsString(parseCircuit(input)) == "gst,khg,nhn,tvb,vdc,z12,z21,z33") } } From 8811f45c9de17cca225c3f92ba48f1610e291888 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Wed, 25 Dec 2024 09:18:57 +0200 Subject: [PATCH 19/99] Solve 2024 day 25 part 1 --- .../eu/sim642/adventofcode2024/day25.txt | 3999 +++++++++++++++++ .../eu/sim642/adventofcode2024/Day25.scala | 27 + .../sim642/adventofcode2024/Day25Test.scala | 56 + 3 files changed, 4082 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2024/day25.txt create mode 100644 src/main/scala/eu/sim642/adventofcode2024/Day25.scala create mode 100644 src/test/scala/eu/sim642/adventofcode2024/Day25Test.scala diff --git 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+.#.## +.#.## +##.## +##.## +##### + +..... +..... +#...# +#...# +##..# +##.## +##### + +..... +.#... +.#... +.##.# +###.# +##### +##### + +..... +..#.. +.##.. +###.# +###.# +##### +##### + +##### +.###. +.#.#. +.#.#. +.#.#. +...#. +..... + +##### +###.# +###.# +.#..# +....# +..... +..... + +..... +.#..# +.##.# +.##.# +.##.# +##### +##### + +##### +##### +##### +###.# +##..# +#.... +..... + +##### +##### +###.# +#.#.. +#.#.. +#.... +..... + +..... +#.#.. +#.#.# +#.#.# +#.#.# +###.# +##### + +..... +..#.. +.##.# +.##.# +##### +##### +##### + +##### +##.## +##.## +#...# +..... +..... +..... + +##### +##.## +##.## +##.## +##.#. +#.... +..... + +..... +..... +..... +#...# +#...# +##.## +##### + +..... +..... +..... +#.#.. +#.#.. +####. +##### + +..... +#.... +#.#.. +#.#.# +#.#.# +#.#.# +##### diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day25.scala b/src/main/scala/eu/sim642/adventofcode2024/Day25.scala new file mode 100644 index 00000000..b083668a --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcode2024/Day25.scala @@ -0,0 +1,27 @@ +package eu.sim642.adventofcode2024 + +import eu.sim642.adventofcodelib.Grid +import eu.sim642.adventofcodelib.GridImplicits._ + +object Day25 { + + def isKey(grid: Grid[Boolean]): Boolean = + grid.head.forall(identity) + + def countLockKeyFits(lockKeys: Seq[Grid[Boolean]]): Int = { + val (keys, locks) = lockKeys.partition(isKey) + (for { + key <- keys + lock <- locks + if key.correspondsGrid(lock)((k, l) => !(k && l)) + } yield ()).size + } + + def parseLockKeys(input: String): Seq[Grid[Boolean]] = input.split("\n\n").map(_.linesIterator.map(_.map(_ == '#').toVector).toVector).toSeq + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day25.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(countLockKeyFits(parseLockKeys(input))) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2024/Day25Test.scala b/src/test/scala/eu/sim642/adventofcode2024/Day25Test.scala new file mode 100644 index 00000000..081714fa --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2024/Day25Test.scala @@ -0,0 +1,56 @@ +package eu.sim642.adventofcode2024 + +import Day25._ +import org.scalatest.funsuite.AnyFunSuite + +class Day25Test extends AnyFunSuite { + + val exampleInput = + """##### + |.#### + |.#### + |.#### + |.#.#. + |.#... + |..... + | + |##### + |##.## + |.#.## + |...## + |...#. + |...#. + |..... + | + |..... + |#.... + |#.... + |#...# + |#.#.# + |#.### + |##### + | + |..... + |..... + |#.#.. + |###.. + |###.# + |###.# + |##### + | + |..... + |..... + |..... + |#.... + |#.#.. + |#.#.# + |#####""".stripMargin + + test("Part 1 examples") { + assert(countLockKeyFits(parseLockKeys(exampleInput)) == 3) + } + + test("Part 1 input answer") { + assert(countLockKeyFits(parseLockKeys(input)) == 3264) + } +} From 326a6c8dbab44ce2bcc52b80eeb1b9cb1d9d5437 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Wed, 25 Dec 2024 09:33:19 +0200 Subject: [PATCH 20/99] Clean up 2024 day 25 --- src/main/scala/eu/sim642/adventofcode2024/Day25.scala | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day25.scala b/src/main/scala/eu/sim642/adventofcode2024/Day25.scala index b083668a..c74ccb1a 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day25.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day25.scala @@ -8,16 +8,21 @@ object Day25 { def isKey(grid: Grid[Boolean]): Boolean = grid.head.forall(identity) + def fits(key: Grid[Boolean], lock: Grid[Boolean]): Boolean = + key.correspondsGrid(lock)((k, l) => !(k && l)) + def countLockKeyFits(lockKeys: Seq[Grid[Boolean]]): Int = { val (keys, locks) = lockKeys.partition(isKey) (for { key <- keys lock <- locks - if key.correspondsGrid(lock)((k, l) => !(k && l)) + if fits(key, lock) } yield ()).size } - def parseLockKeys(input: String): Seq[Grid[Boolean]] = input.split("\n\n").map(_.linesIterator.map(_.map(_ == '#').toVector).toVector).toSeq + def parseLockKey(s: String): Grid[Boolean] = s.linesIterator.map(_.map(_ == '#').toVector).toVector + + def parseLockKeys(input: String): Seq[Grid[Boolean]] = input.split("\n\n").map(parseLockKey).toSeq lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day25.txt")).mkString.trim From ad240bbd2b0e7a7c33b8a29d491186dd1561d6a5 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 5 Jan 2025 12:01:07 +0200 Subject: [PATCH 21/99] Add GitHub dependencies CI job --- .github/workflows/sbt.yml | 17 ++++++++++++++++- 1 file changed, 16 insertions(+), 1 deletion(-) diff --git a/.github/workflows/sbt.yml b/.github/workflows/sbt.yml index fe01cba6..b7324597 100644 --- a/.github/workflows/sbt.yml +++ b/.github/workflows/sbt.yml @@ -6,7 +6,6 @@ on: jobs: test: - runs-on: ubuntu-latest steps: @@ -20,3 +19,19 @@ jobs: - uses: sbt/setup-sbt@v1 - name: Test with SBT run: sbt test + + deps: + # if: github.head_ref == 'master' + + runs-on: ubuntu-latest + + steps: + - uses: actions/checkout@v4 + - name: Set up JDK 21 + uses: actions/setup-java@v4 + with: + distribution: 'zulu' + java-version: '21' + cache: 'sbt' + - uses: sbt/setup-sbt@v1 + - uses: scalacenter/sbt-dependency-submission@v2 From 164276906a5b216efb1bda1a1e2b4dd5f82c211a Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 23 Mar 2025 10:42:57 +0200 Subject: [PATCH 22/99] Prematurely optimize 2024 day 25 part 1 --- src/main/scala/eu/sim642/adventofcode2024/Day25.scala | 6 +----- 1 file changed, 1 insertion(+), 5 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day25.scala b/src/main/scala/eu/sim642/adventofcode2024/Day25.scala index c74ccb1a..6607a194 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day25.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day25.scala @@ -13,11 +13,7 @@ object Day25 { def countLockKeyFits(lockKeys: Seq[Grid[Boolean]]): Int = { val (keys, locks) = lockKeys.partition(isKey) - (for { - key <- keys - lock <- locks - if fits(key, lock) - } yield ()).size + keys.view.map(key => locks.count(fits(key, _))).sum } def parseLockKey(s: String): Grid[Boolean] = s.linesIterator.map(_.map(_ == '#').toVector).toVector From 50418557918486fdb2eca51601932f64f2514d7e Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 23 Mar 2025 11:07:26 +0200 Subject: [PATCH 23/99] Add transit node routing comment --- src/main/scala/eu/sim642/adventofcode2019/Day18.scala | 1 + src/main/scala/eu/sim642/adventofcode2021/Day23.scala | 1 + src/main/scala/eu/sim642/adventofcode2022/Day16.scala | 1 + 3 files changed, 3 insertions(+) diff --git a/src/main/scala/eu/sim642/adventofcode2019/Day18.scala b/src/main/scala/eu/sim642/adventofcode2019/Day18.scala index 67855209..b083cccc 100644 --- a/src/main/scala/eu/sim642/adventofcode2019/Day18.scala +++ b/src/main/scala/eu/sim642/adventofcode2019/Day18.scala @@ -23,6 +23,7 @@ object Day18 { trait KeyNeighborsSolution extends Solution { case class PathData(distance: Int, pathDoors: Set[Pos], pathKeys: Set[Pos]) + // https://en.wikipedia.org/wiki/Transit_node_routing def getKeyNeighbors(input: Input): collection.Map[Pos, collection.Map[Pos, PathData]] override def collectKeysSteps(input: Input): Int = { diff --git a/src/main/scala/eu/sim642/adventofcode2021/Day23.scala b/src/main/scala/eu/sim642/adventofcode2021/Day23.scala index 78440534..569869ad 100644 --- a/src/main/scala/eu/sim642/adventofcode2021/Day23.scala +++ b/src/main/scala/eu/sim642/adventofcode2021/Day23.scala @@ -33,6 +33,7 @@ object Day23 { private case class PathData(length: Int, pathPoss: Set[Pos]) + // https://en.wikipedia.org/wiki/Transit_node_routing private val posNeighbors: collection.Map[Pos, collection.Map[Pos, PathData]] = { val allPoss: Set[Pos] = hallways ++ room2amphipod.keySet diff --git a/src/main/scala/eu/sim642/adventofcode2022/Day16.scala b/src/main/scala/eu/sim642/adventofcode2022/Day16.scala index 5621fecc..0f08baea 100644 --- a/src/main/scala/eu/sim642/adventofcode2022/Day16.scala +++ b/src/main/scala/eu/sim642/adventofcode2022/Day16.scala @@ -12,6 +12,7 @@ object Day16 { case class ValveData(flowRate: Int, tunnels: Seq[Valve]) + // https://en.wikipedia.org/wiki/Transit_node_routing def valveDists(valves: Map[Valve, ValveData]): collection.Map[Valve, collection.Map[Valve, Int]] = { val dists: mutable.Map[Valve, mutable.Map[Valve, Int]] = valves.view.mapValues(_.tunnels.map(_ -> 1).to(mutable.Map)).to(mutable.Map) // Floyd-Warshall From d9b0b37cdb926c4580ff4b8be89535de4f26c9cd Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Fri, 21 Nov 2025 13:04:19 +0200 Subject: [PATCH 24/99] Update Scala to 3.7.4 --- build.sbt | 2 +- project/build.properties | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/build.sbt b/build.sbt index 1ae737b5..35309676 100644 --- a/build.sbt +++ b/build.sbt @@ -2,7 +2,7 @@ name := "adventofcode" version := "0.1" -scalaVersion := "3.5.2" +scalaVersion := "3.7.4" scalacOptions ++= Seq( "-deprecation", "-feature", diff --git a/project/build.properties b/project/build.properties index 1767a6f8..a360ccac 100644 --- a/project/build.properties +++ b/project/build.properties @@ -1 +1 @@ -sbt.version = 1.10.5 +sbt.version = 1.11.7 From c6e764a99488d94da70ec3a2a37dab5476a7df24 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Fri, 21 Nov 2025 13:12:29 +0200 Subject: [PATCH 25/99] Fix deprecated implicit parameters without using from Scala 3.7.0 --- src/main/scala/eu/sim642/adventofcode2017/Day2.scala | 2 +- src/main/scala/eu/sim642/adventofcode2018/Day23.scala | 4 ++-- src/main/scala/eu/sim642/adventofcode2019/Day10.scala | 2 +- src/main/scala/eu/sim642/adventofcode2023/Day7.scala | 8 ++++---- src/main/scala/eu/sim642/adventofcode2024/Day21.scala | 6 ++++-- .../scala/eu/sim642/adventofcodelib/NumberTheory.scala | 2 +- .../scala/eu/sim642/adventofcodelib/graph/AStar.scala | 2 +- .../scala/eu/sim642/adventofcodelib/graph/Dijkstra.scala | 4 ++-- .../scala/eu/sim642/adventofcodelib/graph/NaiveTSP.scala | 6 +++--- 9 files changed, 19 insertions(+), 17 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2017/Day2.scala b/src/main/scala/eu/sim642/adventofcode2017/Day2.scala index b3e6cdf5..429050b7 100644 --- a/src/main/scala/eu/sim642/adventofcode2017/Day2.scala +++ b/src/main/scala/eu/sim642/adventofcode2017/Day2.scala @@ -19,7 +19,7 @@ object Day2 { object Part2 extends Part { override def rowChecksum(row: Seq[Int]): Int = { - val descRow = row.sorted(Ordering[Int].reverse) + val descRow = row.sorted(using Ordering[Int].reverse) val dividePairs = for { i <- descRow.indices j <- (i + 1) until descRow.size diff --git a/src/main/scala/eu/sim642/adventofcode2018/Day23.scala b/src/main/scala/eu/sim642/adventofcode2018/Day23.scala index 543b54df..84f2f233 100644 --- a/src/main/scala/eu/sim642/adventofcode2018/Day23.scala +++ b/src/main/scala/eu/sim642/adventofcode2018/Day23.scala @@ -143,7 +143,7 @@ object Day23 { def closestMostNanobots(nanobots: Seq[Nanobot]): Int = { val queue: mutable.PriorityQueue[(Nanobot, (Int, Int), Int)] = - mutable.PriorityQueue.empty(Ordering.by({ case (octahedron, (lower, upper), originDist) => + mutable.PriorityQueue.empty(using Ordering.by({ case (octahedron, (lower, upper), originDist) => (upper, lower, -originDist) //(upper, -octahedron.radius, -originDist) // much faster but possibly incorrect? })) @@ -241,7 +241,7 @@ object Day23 { def closestMostNanobots(nanobots: Seq[Nanobot]): Int = { val queue: mutable.PriorityQueue[(Box3, (Int, Int), Int)] = - mutable.PriorityQueue.empty(Ordering.by({ case (octahedron, (lower, upper), originDist) => + mutable.PriorityQueue.empty(using Ordering.by({ case (octahedron, (lower, upper), originDist) => (upper, lower, -originDist) //(upper, -octahedron.radius, -originDist) // much faster but possibly incorrect? })) diff --git a/src/main/scala/eu/sim642/adventofcode2019/Day10.scala b/src/main/scala/eu/sim642/adventofcode2019/Day10.scala index 1bebf7d2..83c57419 100644 --- a/src/main/scala/eu/sim642/adventofcode2019/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2019/Day10.scala @@ -65,7 +65,7 @@ object Day10 { Seq.empty else { val visible = filterVisible(monitoring, asteroids) - val vaporizeRotation = visible.toSeq.sortBy(laserAngle(monitoring, _))(Ordering.Double.TotalOrdering) + val vaporizeRotation = visible.toSeq.sortBy(laserAngle(monitoring, _))(using Ordering.Double.TotalOrdering) vaporizeRotation ++ vaporizeSeq(monitoring, asteroids -- visible) } } diff --git a/src/main/scala/eu/sim642/adventofcode2023/Day7.scala b/src/main/scala/eu/sim642/adventofcode2023/Day7.scala index 39d01a29..b3077c97 100644 --- a/src/main/scala/eu/sim642/adventofcode2023/Day7.scala +++ b/src/main/scala/eu/sim642/adventofcode2023/Day7.scala @@ -17,10 +17,10 @@ object Day7 { case HighCard } - val handTypeOrdering: Ordering[HandType] = Ordering.by[HandType, Int](_.ordinal)(Ordering[Int]).reverse + val handTypeOrdering: Ordering[HandType] = Ordering.by[HandType, Int](_.ordinal)(using Ordering[Int]).reverse def handFrequency(hand: Hand): Seq[Int] = - hand.groupCount(identity).values.toSeq.sorted(Ordering[Int].reverse) + hand.groupCount(identity).values.toSeq.sorted(using Ordering[Int].reverse) def frequencyHandType(freq: Seq[Int]): HandType = freq match { case Seq(5) => HandType.FiveOfAKind @@ -40,11 +40,11 @@ object Day7 { def handType(hand: Hand): HandType - val handOrdering: Ordering[Hand] = Ordering.by(handType)(handTypeOrdering).orElse(Ordering.Implicits.seqOrdering(cardOrdering)) + val handOrdering: Ordering[Hand] = Ordering.by(handType)(using handTypeOrdering).orElse(Ordering.Implicits.seqOrdering(using cardOrdering)) def totalWinnings(hands: Seq[(Hand, Int)]): Int = { hands - .sortBy(_._1)(handOrdering) + .sortBy(_._1)(using handOrdering) .zipWithIndex .map({ case ((hand, bid), i) => (i + 1) * bid }) .sum diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day21.scala b/src/main/scala/eu/sim642/adventofcode2024/Day21.scala index b81f5303..9343593f 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day21.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day21.scala @@ -87,8 +87,10 @@ object Day21 { override val startNode: State = State(List.fill(directionalKeypads)(directionalKeypad.posOf('A')), numericKeypad.posOf('A'), "") - override def unitNeighbors(state: State): IterableOnce[State] = - "^A".iterator.flatten(state.userPress).filter(newState => code.startsWith(newState.input)) + override def unitNeighbors(state: State): IterableOnce[State] = { + // TODO: why not flatMap? + "^A".iterator.flatten(using state.userPress).filter(newState => code.startsWith(newState.input)) + } override def isTargetNode(state: State, dist: Int): Boolean = state.input == code } diff --git a/src/main/scala/eu/sim642/adventofcodelib/NumberTheory.scala b/src/main/scala/eu/sim642/adventofcodelib/NumberTheory.scala index 1b20a557..9f5f736a 100644 --- a/src/main/scala/eu/sim642/adventofcodelib/NumberTheory.scala +++ b/src/main/scala/eu/sim642/adventofcodelib/NumberTheory.scala @@ -70,7 +70,7 @@ object NumberTheory { } def sieveCrt[A](ans: Seq[(A, A)])(using aIntegral: Integral[A]): (A, A) = { - ans.sortBy(_._2)(aIntegral.reverse) + ans.sortBy(_._2)(using aIntegral.reverse) .reduceLeft(sieveCrt2(_, _)) } } diff --git a/src/main/scala/eu/sim642/adventofcodelib/graph/AStar.scala b/src/main/scala/eu/sim642/adventofcodelib/graph/AStar.scala index fe81053a..ce87aa45 100644 --- a/src/main/scala/eu/sim642/adventofcodelib/graph/AStar.scala +++ b/src/main/scala/eu/sim642/adventofcodelib/graph/AStar.scala @@ -6,7 +6,7 @@ object AStar { // moved from 2018 Day 22 def search[A](graphSearch: GraphSearch[A] & Heuristic[A]): Distances[A] & Target[A] = { val visitedDistance: mutable.Map[A, Int] = mutable.Map.empty - val toVisit: mutable.PriorityQueue[(Int, Int, A)] = mutable.PriorityQueue.empty(Ordering.by(-_._1)) + val toVisit: mutable.PriorityQueue[(Int, Int, A)] = mutable.PriorityQueue.empty(using Ordering.by(-_._1)) def enqueueHeuristically(node: A, dist: Int): Unit = { toVisit.enqueue((dist + graphSearch.heuristic(node), dist, node)) diff --git a/src/main/scala/eu/sim642/adventofcodelib/graph/Dijkstra.scala b/src/main/scala/eu/sim642/adventofcodelib/graph/Dijkstra.scala index 5503b2fe..b90d5574 100644 --- a/src/main/scala/eu/sim642/adventofcodelib/graph/Dijkstra.scala +++ b/src/main/scala/eu/sim642/adventofcodelib/graph/Dijkstra.scala @@ -8,7 +8,7 @@ object Dijkstra { // copied from AStar def traverse[A](graphTraversal: GraphTraversal[A]): Distances[A] = { val visitedDistance: mutable.Map[A, Int] = mutable.Map.empty - val toVisit: mutable.PriorityQueue[(Int, A)] = mutable.PriorityQueue.empty(Ordering.by(-_._1)) + val toVisit: mutable.PriorityQueue[(Int, A)] = mutable.PriorityQueue.empty(using Ordering.by(-_._1)) def enqueue(node: A, dist: Int): Unit = { toVisit.enqueue((dist, node)) @@ -40,7 +40,7 @@ object Dijkstra { // copied from AStar def search[A](graphSearch: GraphSearch[A]): Distances[A] & Target[A] = { val visitedDistance: mutable.Map[A, Int] = mutable.Map.empty - val toVisit: mutable.PriorityQueue[(Int, A)] = mutable.PriorityQueue.empty(Ordering.by(-_._1)) + val toVisit: mutable.PriorityQueue[(Int, A)] = mutable.PriorityQueue.empty(using Ordering.by(-_._1)) def enqueue(node: A, dist: Int): Unit = { toVisit.enqueue((dist, node)) diff --git a/src/main/scala/eu/sim642/adventofcodelib/graph/NaiveTSP.scala b/src/main/scala/eu/sim642/adventofcodelib/graph/NaiveTSP.scala index 43b3370f..5e46d162 100644 --- a/src/main/scala/eu/sim642/adventofcodelib/graph/NaiveTSP.scala +++ b/src/main/scala/eu/sim642/adventofcodelib/graph/NaiveTSP.scala @@ -19,7 +19,7 @@ object NaiveTSP { .permutations .map({ path => totalPathLength(distanceMatrix, path) - }).min(lengthOrdering) + }).min(using lengthOrdering) } // moved from 2016 Day 24 @@ -29,7 +29,7 @@ object NaiveTSP { .map({ path => distanceMatrix(start)(path.head) + totalPathLength(distanceMatrix, path) - }).min(lengthOrdering) + }).min(using lengthOrdering) } // moved from 2016 Day 24 @@ -40,7 +40,7 @@ object NaiveTSP { distanceMatrix(start)(path.head) + totalPathLength(distanceMatrix, path) + distanceMatrix(path.last)(start) - }).min(lengthOrdering) + }).min(using lengthOrdering) } def cycleLength[A](distanceMatrix: DistanceMatrix[A])(using lengthOrdering: Ordering[Int]): Int = { From 6b0cdde1849f1764c97d1e83b04a3f7ad9946c85 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Fri, 21 Nov 2025 13:20:39 +0200 Subject: [PATCH 26/99] Fix non-exhaustiveness warnings using IllegalArgumentException --- src/main/scala/eu/sim642/adventofcode2019/Day13.scala | 2 ++ src/main/scala/eu/sim642/adventofcode2022/Day22.scala | 2 ++ src/main/scala/eu/sim642/adventofcode2023/Day8.scala | 1 + 3 files changed, 5 insertions(+) diff --git a/src/main/scala/eu/sim642/adventofcode2019/Day13.scala b/src/main/scala/eu/sim642/adventofcode2019/Day13.scala index 42c81349..54245111 100644 --- a/src/main/scala/eu/sim642/adventofcode2019/Day13.scala +++ b/src/main/scala/eu/sim642/adventofcode2019/Day13.scala @@ -16,6 +16,8 @@ object Day13 { case (acc, LazyList(x, y, tile)) => val pos = Pos(x.toInt, y.toInt) acc + (pos -> tile.toInt) + case (_, _) => + throw new IllegalArgumentException("incomplete output") }) } diff --git a/src/main/scala/eu/sim642/adventofcode2022/Day22.scala b/src/main/scala/eu/sim642/adventofcode2022/Day22.scala index e8ee4811..6f107a46 100644 --- a/src/main/scala/eu/sim642/adventofcode2022/Day22.scala +++ b/src/main/scala/eu/sim642/adventofcode2022/Day22.scala @@ -85,6 +85,7 @@ object Day22 { case Pos(0, 1) => Pos(pos.x, mapTranspose(pos.x).indexWhere(_ != ' ')) case Pos(-1, 0) => Pos(map(pos.y).lastIndexWhere(_ != ' '), pos.y) case Pos(0, -1) => Pos(pos.x, mapTranspose(pos.x).lastIndexWhere(_ != ' ')) + case _ => throw new IllegalArgumentException("illegal facing") } PosFacing(newPos, facing) } @@ -120,6 +121,7 @@ object Day22 { case Pos(0, 1) => Pos(edgeLength - 1, edgeLength - 1) case Pos(-1, 0) => Pos(0, edgeLength - 1) case Pos(0, -1) => Pos(0, 0) + case _ => throw new IllegalArgumentException("illegal edge") } def wrap(posFacing: PosFacing): PosFacing = { diff --git a/src/main/scala/eu/sim642/adventofcode2023/Day8.scala b/src/main/scala/eu/sim642/adventofcode2023/Day8.scala index afe92524..cec4b453 100644 --- a/src/main/scala/eu/sim642/adventofcode2023/Day8.scala +++ b/src/main/scala/eu/sim642/adventofcode2023/Day8.scala @@ -15,6 +15,7 @@ object Day8 { instructions.cycle.scanLeft(startNode)({ case (node, 'L') => network(node)._1 case (node, 'R') => network(node)._2 + case _ => throw new IllegalArgumentException("illegal instruction") }) } From f34029304cf5e20a56e061090a3fdb0bd5b91210 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Fri, 21 Nov 2025 13:24:38 +0200 Subject: [PATCH 27/99] Suppress refutable pattern warnings --- src/main/scala/eu/sim642/adventofcode2024/Day17.scala | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2024/Day17.scala b/src/main/scala/eu/sim642/adventofcode2024/Day17.scala index e96d0952..c0552551 100644 --- a/src/main/scala/eu/sim642/adventofcode2024/Day17.scala +++ b/src/main/scala/eu/sim642/adventofcode2024/Day17.scala @@ -102,7 +102,7 @@ object Day17 { object ReverseEngineeredZ3Part2Solution extends Part2Solution { override def findQuineA(input: Input): Long = { - val Seq(2, 4, 1, bxl1, 7, 5, 1, bxl2, 4, 5, 0, 3, 5, 5, 3, 0) = input.program // TODO: doesn't support other orders of some operations + val Seq(2, 4, 1, bxl1, 7, 5, 1, bxl2, 4, 5, 0, 3, 5, 5, 3, 0) = input.program: @unchecked // TODO: doesn't support other orders of some operations val ctx = new Context(Map("model" -> "true").asJava) import ctx._ @@ -211,7 +211,7 @@ object Day17 { object ReverseEngineeredPart2Solution extends Part2Solution { override def findQuineA(input: Input): Long = { - val iterProgram :+ 3 :+ 0 = input.program + val iterProgram :+ 3 :+ 0 = input.program: @unchecked @tailrec def helper(as: Set[Long], expectedOutputsRev: List[Byte]): Set[Long] = expectedOutputsRev match { From d579c6809552f1f5683de021d3a460b37777cac9 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Fri, 21 Nov 2025 13:36:38 +0200 Subject: [PATCH 28/99] Update dependencies --- build.sbt | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/build.sbt b/build.sbt index 35309676..f6c54161 100644 --- a/build.sbt +++ b/build.sbt @@ -16,11 +16,11 @@ scalacOptions ++= Seq( libraryDependencies += "org.scalactic" %% "scalactic" % "3.2.19" libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.19" % "test" -libraryDependencies += "org.scalacheck" %% "scalacheck" % "1.18.1" % "test" +libraryDependencies += "org.scalacheck" %% "scalacheck" % "1.18.1" % "test" // TODO: 1.19 available, but not corresponding scalatestplus libraryDependencies += "org.scalatestplus" %% "scalacheck-1-18" % "3.2.19.0" % "test" libraryDependencies += "org.scala-lang.modules" %% "scala-parser-combinators" % "2.4.0" -libraryDependencies += "com.lihaoyi" %% "ujson" % "4.0.2" -libraryDependencies += "tools.aqua" % "z3-turnkey" % "4.13.0.1" +libraryDependencies += "com.lihaoyi" %% "ujson" % "4.4.1" +libraryDependencies += "tools.aqua" % "z3-turnkey" % "4.14.1" libraryDependencies += "io.github.hughsimpson" %% "scalameter" % "0.22.1" % "test" // Scala 3 compatible scalameter fork // TODO: scalameter tests don't work in SBT From 3b5ef0a914160e5d0560c85f3f4842a3cff1d635 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Fri, 21 Nov 2025 13:37:27 +0200 Subject: [PATCH 29/99] Add 2025 to README --- README.md | 1 + 1 file changed, 1 insertion(+) diff --git a/README.md b/README.md index 383b7e3d..4f1d4300 100644 --- a/README.md +++ b/README.md @@ -14,3 +14,4 @@ | 2022 | [Solutions](src/main/scala/eu/sim642/adventofcode2022) | [My inputs](src/main/resources/eu/sim642/adventofcode2022) | [Tests](src/test/scala/eu/sim642/adventofcode2022) | | 2023 | [Solutions](src/main/scala/eu/sim642/adventofcode2023) | [My inputs](src/main/resources/eu/sim642/adventofcode2023) | [Tests](src/test/scala/eu/sim642/adventofcode2023) | | 2024 | [Solutions](src/main/scala/eu/sim642/adventofcode2024) | [My inputs](src/main/resources/eu/sim642/adventofcode2024) | [Tests](src/test/scala/eu/sim642/adventofcode2024) | +| 2025 | [Solutions](src/main/scala/eu/sim642/adventofcode2025) | [My inputs](src/main/resources/eu/sim642/adventofcode2025) | [Tests](src/test/scala/eu/sim642/adventofcode2025) | From eff16920ce664a1b8834ef397de1a4815da78025 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Fri, 21 Nov 2025 13:56:13 +0200 Subject: [PATCH 30/99] Update Java to 25 --- .github/workflows/sbt.yml | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/.github/workflows/sbt.yml b/.github/workflows/sbt.yml index 7324cc23..797c4b6a 100644 --- a/.github/workflows/sbt.yml +++ b/.github/workflows/sbt.yml @@ -10,11 +10,11 @@ jobs: steps: - uses: actions/checkout@v4 - - name: Set up JDK 21 + - name: Set up JDK 25 uses: actions/setup-java@v4 with: distribution: 'zulu' - java-version: '21' + java-version: '25' cache: 'sbt' - uses: sbt/setup-sbt@v1 - name: Test with SBT @@ -27,11 +27,11 @@ jobs: steps: - uses: actions/checkout@v4 - - name: Set up JDK 21 + - name: Set up JDK 25 uses: actions/setup-java@v4 with: distribution: 'zulu' - java-version: '21' + java-version: '25' cache: 'sbt' - uses: sbt/setup-sbt@v1 - uses: scalacenter/sbt-dependency-submission@v2 From 0b85ecaee3bae5cd39b1eedaadd614b798cacf71 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 1 Dec 2025 07:50:21 +0200 Subject: [PATCH 31/99] Solve 2025 day 1 part 1 --- .../eu/sim642/adventofcode2025/day1.txt | 4099 +++++++++++++++++ .../eu/sim642/adventofcode2025/Day1.scala | 25 + 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+R556 +R75 +R63 +L83 +R78 +R87 +R60 +L18 +R31 +L83 +L835 +R25 +R38 +R79 +L26 +R27 +L57 +L76 +L47 +L98 +R98 +R14 +L71 +L43 +R91 +R9 +L90 +R33 +L43 +R32 +L17 +R26 +L41 +L52 +R93 +R60 +R5 +L6 +R58 +R56 +L6 +L8 +R77 +R23 +R12 +R92 +L4 +R74 +R26 +L26 +R41 +R33 +R77 +R79 +L89 +L45 +R86 +R44 +R88 +L21 +R89 +R41 +L97 +R69 +R55 +R49 +L29 +L28 +R45 +L30 +L25 +R49 +L19 +L6 +L49 +R36 +L41 +L26 +R36 +R33 +R44 +L48 +R10 +R5 +R49 +R1 +L26 +L20 +L4 +R20 +L4 +L18 +L8 +L36 +R44 +L30 +L37 +L18 +R22 +R23 +R17 +R47 +L41 +R1 +R42 +R49 +R31 +L39 +L50 +R39 +L3 +R26 +L21 +L1 +R14 diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day1.scala b/src/main/scala/eu/sim642/adventofcode2025/Day1.scala new file mode 100644 index 00000000..20b637cd --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcode2025/Day1.scala @@ -0,0 +1,25 @@ +package eu.sim642.adventofcode2025 + +import eu.sim642.adventofcodelib.IntegralImplicits._ + +object Day1 { + + def actualPassword(rotations: Seq[Int]): Int = { + rotations + .scanLeft[Int](50)((a, b) => (a + b) %+ 100) // TODO: why can't use implicit arguments? + .count(_ == 0) + } + + def parseRotation(s: String): Int = s match { + case s"L$i" => -i.toInt + case s"R$i" => i.toInt + } + + def parseRotations(input: String): Seq[Int] = input.linesIterator.map(parseRotation).toSeq + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day1.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(actualPassword(parseRotations(input))) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day1Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day1Test.scala new file mode 100644 index 00000000..0f127af2 --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2025/Day1Test.scala @@ -0,0 +1,27 @@ +package eu.sim642.adventofcode2025 + +import Day1._ +import org.scalatest.funsuite.AnyFunSuite + +class Day1Test extends AnyFunSuite { + + val exampleInput = + """L68 + |L30 + |R48 + |L5 + |R60 + |L55 + |L1 + |L99 + |R14 + |L82""".stripMargin + + test("Part 1 example") { + assert(actualPassword(parseRotations(exampleInput)) == 3) + } + + test("Part 1 input answer") { + assert(actualPassword(parseRotations(input)) == 995) + } +} From 89824ade5e3c17bc759a3ee447ff0e82ed9c915d Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 1 Dec 2025 08:00:59 +0200 Subject: [PATCH 32/99] Solve 2025 day 1 part 2 --- .../eu/sim642/adventofcode2025/Day1.scala | 29 +++++++++++++++---- .../eu/sim642/adventofcode2025/Day1Test.scala | 15 ++++++++-- 2 files changed, 36 insertions(+), 8 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day1.scala b/src/main/scala/eu/sim642/adventofcode2025/Day1.scala index 20b637cd..57fc93ed 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day1.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day1.scala @@ -4,10 +4,28 @@ import eu.sim642.adventofcodelib.IntegralImplicits._ object Day1 { - def actualPassword(rotations: Seq[Int]): Int = { - rotations - .scanLeft[Int](50)((a, b) => (a + b) %+ 100) // TODO: why can't use implicit arguments? - .count(_ == 0) + trait Part { + def password(rotations: Seq[Int]): Int + } + + object Part1 extends Part { + override def password(rotations: Seq[Int]): Int = { + rotations + .scanLeft[Int](50)((a, b) => (a + b) %+ 100) // TODO: why can't use implicit arguments? + .count(_ == 0) + } + } + + object Part2 extends Part { + override def password(rotations: Seq[Int]): Int = { + rotations + .flatMap({ // expand all rotations to single to make each tick observable, this is silly but works + case i if i >= 0 => Seq.fill(i)(1) + case i if i < 0 => Seq.fill(-i)(-1) + }) + .scanLeft[Int](50)((a, b) => (a + b) %+ 100) // TODO: why can't use implicit arguments? + .count(_ == 0) + } } def parseRotation(s: String): Int = s match { @@ -20,6 +38,7 @@ object Day1 { lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day1.txt")).mkString.trim def main(args: Array[String]): Unit = { - println(actualPassword(parseRotations(input))) + println(Part1.password(parseRotations(input))) + println(Part2.password(parseRotations(input))) } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day1Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day1Test.scala index 0f127af2..e72a2840 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day1Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day1Test.scala @@ -17,11 +17,20 @@ class Day1Test extends AnyFunSuite { |R14 |L82""".stripMargin - test("Part 1 example") { - assert(actualPassword(parseRotations(exampleInput)) == 3) + test("Part 1 examples") { + assert(Part1.password(parseRotations(exampleInput)) == 3) } test("Part 1 input answer") { - assert(actualPassword(parseRotations(input)) == 995) + assert(Part1.password(parseRotations(input)) == 995) + } + + test("Part 2 examples") { + assert(Part2.password(parseRotations(exampleInput)) == 6) + assert(Part2.password(parseRotations("R1000")) == 10) + } + + test("Part 2 input answer") { + assert(Part2.password(parseRotations(input)) == 5847) } } From c56403ac56a0bfe28ce71734a2d25a08abfde4fd Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 1 Dec 2025 08:28:40 +0200 Subject: [PATCH 33/99] Refactor 2025 day 1 part 2 --- src/main/scala/eu/sim642/adventofcode2025/Day1.scala | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day1.scala b/src/main/scala/eu/sim642/adventofcode2025/Day1.scala index 57fc93ed..cff3aa3e 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day1.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day1.scala @@ -18,13 +18,9 @@ object Day1 { object Part2 extends Part { override def password(rotations: Seq[Int]): Int = { - rotations - .flatMap({ // expand all rotations to single to make each tick observable, this is silly but works - case i if i >= 0 => Seq.fill(i)(1) - case i if i < 0 => Seq.fill(-i)(-1) - }) - .scanLeft[Int](50)((a, b) => (a + b) %+ 100) // TODO: why can't use implicit arguments? - .count(_ == 0) + // expand all rotations to single to make each click observable, this is silly but works + val newRotations = rotations.flatMap(i => Seq.fill(i.abs)(i.sign)) + Part1.password(newRotations) } } From 45364b44a965d382a2fb4244637db8c6651d2b06 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 2 Dec 2025 07:25:50 +0200 Subject: [PATCH 34/99] Solve 2025 day 2 part 1 --- .../eu/sim642/adventofcode2025/day2.txt | 1 + .../eu/sim642/adventofcode2025/Day2.scala | 35 +++++++++++++++++++ .../eu/sim642/adventofcode2025/Day2Test.scala | 18 ++++++++++ 3 files changed, 54 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2025/day2.txt create mode 100644 src/main/scala/eu/sim642/adventofcode2025/Day2.scala create mode 100644 src/test/scala/eu/sim642/adventofcode2025/Day2Test.scala diff --git a/src/main/resources/eu/sim642/adventofcode2025/day2.txt b/src/main/resources/eu/sim642/adventofcode2025/day2.txt new file mode 100644 index 00000000..0b040d76 --- /dev/null +++ b/src/main/resources/eu/sim642/adventofcode2025/day2.txt @@ -0,0 +1 @@ +9191896883-9191940271,457499-518693,4952-6512,960-1219,882220-1039699,2694-3465,3818-4790,166124487-166225167,759713819-759869448,4821434-4881387,7271-9983,1182154-1266413,810784-881078,802-958,1288-1491,45169-59445,25035-29864,379542-433637,287-398,75872077-75913335,653953-689335,168872-217692,91-113,475-590,592-770,310876-346156,2214325-2229214,85977-112721,51466993-51620441,8838997-8982991,534003-610353,32397-42770,17-27,68666227-68701396,1826294188-1826476065,1649-2195,141065204-141208529,7437352-7611438,10216-13989,33-44,1-16,49-74,60646-73921,701379-808878 diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day2.scala b/src/main/scala/eu/sim642/adventofcode2025/Day2.scala new file mode 100644 index 00000000..e93593c7 --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcode2025/Day2.scala @@ -0,0 +1,35 @@ +package eu.sim642.adventofcode2025 + +import eu.sim642.adventofcode2016.Day20.Interval + +object Day2 { + + type Range = Interval + + val invalidIds: LazyList[Long] = LazyList.from(1).map(i => + val len = i.toString.length // TODO: already have a (better) way to get number of digits? + i * (Math.powExact(10L, len) + 1) + ) + + def sumInvalidIds(ranges: Seq[Range]): Long = { // TODO: Long? + val max = ranges.map(_.max).max + invalidIds + .takeWhile(_ <= max) + .filter(id => + ranges.exists(_.contains(id)) + ) + .sum + } + + def parseRange(s: String): Range = s match { + case s"$i-$j" => Interval(i.toLong, j.toLong) + } + + def parseRanges(input: String): Seq[Interval] = input.split(",").toSeq.map(parseRange) + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day2.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(sumInvalidIds(parseRanges(input))) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day2Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day2Test.scala new file mode 100644 index 00000000..fb1cc44f --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2025/Day2Test.scala @@ -0,0 +1,18 @@ +package eu.sim642.adventofcode2025 + +import Day2._ +import org.scalatest.funsuite.AnyFunSuite + +class Day2Test extends AnyFunSuite { + + val exampleInput = + """11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124""" + + test("Part 1 examples") { + assert(sumInvalidIds(parseRanges(exampleInput)) == 1227775554) + } + + test("Part 1 input answer") { + assert(sumInvalidIds(parseRanges(input)) == 5398419778L) + } +} From 83ef6e4332822371436ec26354a13974360882b1 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 2 Dec 2025 07:54:05 +0200 Subject: [PATCH 35/99] Solve 2025 day 2 part 2 --- .../eu/sim642/adventofcode2025/Day2.scala | 41 +++++++++++++------ .../eu/sim642/adventofcode2025/Day2Test.scala | 12 +++++- 2 files changed, 39 insertions(+), 14 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day2.scala b/src/main/scala/eu/sim642/adventofcode2025/Day2.scala index e93593c7..9805afff 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day2.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day2.scala @@ -6,19 +6,35 @@ object Day2 { type Range = Interval - val invalidIds: LazyList[Long] = LazyList.from(1).map(i => - val len = i.toString.length // TODO: already have a (better) way to get number of digits? - i * (Math.powExact(10L, len) + 1) + def numDigits(i: Long): Int = { + i.toString.length // TODO: already have a (better) way to get number of digits? + } + + def invalidIds(times: Int): LazyList[Long] = LazyList.from(1).map(i => + val pow = Math.powExact(10L, numDigits(i)) + val pattern = (1 until times).foldLeft(1L)((acc, _) => pow * acc + 1) + i * pattern ) - def sumInvalidIds(ranges: Seq[Range]): Long = { // TODO: Long? - val max = ranges.map(_.max).max - invalidIds - .takeWhile(_ <= max) - .filter(id => - ranges.exists(_.contains(id)) - ) - .sum + trait Part { + def maxTimes(max: Long): Int + + def sumInvalidIds(ranges: Seq[Range]): Long = { + val max = ranges.map(_.max).max + (for { + times <- 2 to maxTimes(max) // TODO: bad shadowing + id <- invalidIds(times).takeWhile(_ <= max) + if ranges.exists(_.contains(id)) + } yield id).toSet.sum // toSet because some IDs can be created multiple ways (2222 is 2-2-2-2 and 22-22), but shouldn't count multiple times + } + } + + object Part1 extends Part { + override def maxTimes(max: Long): Int = 2 + } + + object Part2 extends Part { + override def maxTimes(max: Long): Int = numDigits(max) } def parseRange(s: String): Range = s match { @@ -30,6 +46,7 @@ object Day2 { lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day2.txt")).mkString.trim def main(args: Array[String]): Unit = { - println(sumInvalidIds(parseRanges(input))) + println(Part1.sumInvalidIds(parseRanges(input))) + println(Part2.sumInvalidIds(parseRanges(input))) } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day2Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day2Test.scala index fb1cc44f..b5923d88 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day2Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day2Test.scala @@ -9,10 +9,18 @@ class Day2Test extends AnyFunSuite { """11-22,95-115,998-1012,1188511880-1188511890,222220-222224,1698522-1698528,446443-446449,38593856-38593862,565653-565659,824824821-824824827,2121212118-2121212124""" test("Part 1 examples") { - assert(sumInvalidIds(parseRanges(exampleInput)) == 1227775554) + assert(Part1.sumInvalidIds(parseRanges(exampleInput)) == 1227775554) } test("Part 1 input answer") { - assert(sumInvalidIds(parseRanges(input)) == 5398419778L) + assert(Part1.sumInvalidIds(parseRanges(input)) == 5398419778L) + } + + test("Part 2 examples") { + assert(Part2.sumInvalidIds(parseRanges(exampleInput)) == 4174379265L) + } + + test("Part 2 input answer") { + assert(Part2.sumInvalidIds(parseRanges(input)) == 15704845910L) } } From 983eb8d890042a5f6aae60c0ccb4cc9976c039dd Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Wed, 3 Dec 2025 07:25:41 +0200 Subject: [PATCH 36/99] Solve 2025 day 3 part 1 --- .../eu/sim642/adventofcode2025/day3.txt | 200 ++++++++++++++++++ .../eu/sim642/adventofcode2025/Day3.scala | 28 +++ .../eu/sim642/adventofcode2025/Day3Test.scala | 21 ++ 3 files changed, 249 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2025/day3.txt create mode 100644 src/main/scala/eu/sim642/adventofcode2025/Day3.scala create mode 100644 src/test/scala/eu/sim642/adventofcode2025/Day3Test.scala diff --git a/src/main/resources/eu/sim642/adventofcode2025/day3.txt b/src/main/resources/eu/sim642/adventofcode2025/day3.txt new file mode 100644 index 00000000..da1e67f8 --- /dev/null +++ b/src/main/resources/eu/sim642/adventofcode2025/day3.txt @@ -0,0 +1,200 @@ +1122328377227565294573525668246252925164246287987784122693983869922222576473238222367725229292476776 +3439534344443341434449413434544546443313443434337243446444273233229964474333524343343263333397462332 +6446534656654345665545756845652445664554567453344355533455445732365554785365556466544424657625334454 +5764366546346565433173426656673446256755342552276356475358736554561768323235448436642626716668436552 +2432245322434343223312234234145234422422151425334232333434465223124422432123313313144223245434213122 +6373269138466626334224232272352251726573428236361362251272335335353545412626366252362443323122568732 +5673357339533533557574944447475576653565555474357764385574312376575243553954836367339357555551434444 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def totalJoltage(banks: Seq[Bank]): Int = banks.map(maxJoltage).sum + + def parseBanks(input: String): Seq[Bank] = input.linesIterator.toSeq + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day3.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(totalJoltage(parseBanks(input))) + + // part 1: 16769 - not right (combinations don't keep order) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day3Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day3Test.scala new file mode 100644 index 00000000..755acbb2 --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2025/Day3Test.scala @@ -0,0 +1,21 @@ +package eu.sim642.adventofcode2025 + +import Day3._ +import org.scalatest.funsuite.AnyFunSuite + +class Day3Test extends AnyFunSuite { + + val exampleInput = + """987654321111111 + |811111111111119 + |234234234234278 + |818181911112111""".stripMargin + + test("Part 1 examples") { + assert(totalJoltage(parseBanks(exampleInput)) == 357) + } + + test("Part 1 input answer") { + assert(totalJoltage(parseBanks(input)) == 17301) + } +} From 7acad03b6a6d93c4e8deeeed45364c0c572b7847 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Wed, 3 Dec 2025 07:47:18 +0200 Subject: [PATCH 37/99] Solve 2025 day 3 part 2 --- .../eu/sim642/adventofcode2025/Day3.scala | 42 ++++++++++++++----- .../eu/sim642/adventofcode2025/Day3Test.scala | 15 ++++++- 2 files changed, 45 insertions(+), 12 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day3.scala b/src/main/scala/eu/sim642/adventofcode2025/Day3.scala index da8689c3..ad3f4afa 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day3.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day3.scala @@ -1,27 +1,49 @@ package eu.sim642.adventofcode2025 +import scala.collection.mutable + object Day3 { type Bank = String - def maxJoltage(bank: Bank): Int = { - // TODO: doesn't keep order - //bank.combinations(2).map(_.toInt).max - // TODO: can be made linearly? - (for { - i <- bank.indices - j <- (i + 1) until bank.length - } yield s"${bank(i)}${bank(j)}".toInt).max + def maxJoltageDigits(bank: Bank, digits: Int): Long = { + val memo = mutable.Map.empty[(Int, Int), Long] + + def helper(i: Int, digits: Int): Long = { + memo.getOrElseUpdate((i, digits), { + if (i >= 0 && digits >= 1) { + helper(i - 1, digits) max (helper(i - 1, digits - 1) * 10 + bank(i).asDigit) + } else + 0 + }) + } + + helper(bank.length - 1, digits) + } + + trait Part { + val digits: Int + + def maxJoltage(bank: Bank): Long = maxJoltageDigits(bank, digits) + + def totalJoltage(banks: Seq[Bank]): Long = banks.map(maxJoltage).sum } - def totalJoltage(banks: Seq[Bank]): Int = banks.map(maxJoltage).sum + object Part1 extends Part { + override val digits: Int = 2 + } + + object Part2 extends Part { + override val digits: Int = 12 + } def parseBanks(input: String): Seq[Bank] = input.linesIterator.toSeq lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day3.txt")).mkString.trim def main(args: Array[String]): Unit = { - println(totalJoltage(parseBanks(input))) + println(Part1.totalJoltage(parseBanks(input))) + println(Part2.totalJoltage(parseBanks(input))) // part 1: 16769 - not right (combinations don't keep order) } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day3Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day3Test.scala index 755acbb2..c264d154 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day3Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day3Test.scala @@ -12,10 +12,21 @@ class Day3Test extends AnyFunSuite { |818181911112111""".stripMargin test("Part 1 examples") { - assert(totalJoltage(parseBanks(exampleInput)) == 357) + assert(Part1.maxJoltage("98") == 98) + assert(Part1.maxJoltage("987") == 98) + assert(Part1.totalJoltage(parseBanks(exampleInput)) == 357) } test("Part 1 input answer") { - assert(totalJoltage(parseBanks(input)) == 17301) + assert(Part1.totalJoltage(parseBanks(input)) == 17301) + } + + test("Part 2 examples") { + assert(Part2.maxJoltage("987654321111111") == 987654321111L) + assert(Part2.totalJoltage(parseBanks(exampleInput)) == 3121910778619L) + } + + test("Part 2 input answer") { + assert(Part2.totalJoltage(parseBanks(input)) == 172162399742349L) } } From d11c8a970d791a97208071f3e7a22d26c043315a Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Thu, 4 Dec 2025 07:15:44 +0200 Subject: [PATCH 38/99] Solve 2025 day 4 part 1 --- .../eu/sim642/adventofcode2025/day4.txt | 139 ++++++++++++++++++ .../eu/sim642/adventofcode2025/Day4.scala | 27 ++++ .../eu/sim642/adventofcode2025/Day4Test.scala | 27 ++++ 3 files changed, 193 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2025/day4.txt create mode 100644 src/main/scala/eu/sim642/adventofcode2025/Day4.scala create mode 100644 src/test/scala/eu/sim642/adventofcode2025/Day4Test.scala diff 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+.@@@..@@@@@@@....@@@@.@@@@@.@@@@@@@.@@@@@.@@.@@@@.@.@.@@.@@@@..@@.@......@@@@.@@@@....@@.@@@.@.@@.@@@@@@.@@@@@.@.@@...@@.@@.@...@@@..@@@@.. diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day4.scala b/src/main/scala/eu/sim642/adventofcode2025/Day4.scala new file mode 100644 index 00000000..73bb40ff --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcode2025/Day4.scala @@ -0,0 +1,27 @@ +package eu.sim642.adventofcode2025 + +import eu.sim642.adventofcodelib.Grid +import eu.sim642.adventofcodelib.GridImplicits._ +import eu.sim642.adventofcodelib.pos.Pos + +object Day4 { + + def countAccessibleRolls(grid: Grid[Char]): Int = { + (for { + (row, y) <- grid.view.zipWithIndex + (cell, x) <- row.view.zipWithIndex + pos = Pos(x, y) + if grid(pos) == '@' + neighbors = Pos.allOffsets.map(pos + _).filter(grid.containsPos) + if neighbors.count(grid(_) == '@') < 4 + } yield pos).size + } + + def parseGrid(input: String): Grid[Char] = input.linesIterator.map(_.toVector).toVector + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day4.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(countAccessibleRolls(parseGrid(input))) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day4Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day4Test.scala new file mode 100644 index 00000000..0437c7c7 --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2025/Day4Test.scala @@ -0,0 +1,27 @@ +package eu.sim642.adventofcode2025 + +import Day4._ +import org.scalatest.funsuite.AnyFunSuite + +class Day4Test extends AnyFunSuite { + + val exampleInput = + """..@@.@@@@. + |@@@.@.@.@@ + |@@@@@.@.@@ + |@.@@@@..@. + |@@.@@@@.@@ + |.@@@@@@@.@ + |.@.@.@.@@@ + |@.@@@.@@@@ + |.@@@@@@@@. + |@.@.@@@.@.""".stripMargin + + test("Part 1 examples") { + assert(countAccessibleRolls(parseGrid(exampleInput)) == 13) + } + + test("Part 1 input answer") { + assert(countAccessibleRolls(parseGrid(input)) == 1527) + } +} From 2eae311dba569db13639b09d604c5d2c73ab9d21 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Thu, 4 Dec 2025 07:20:44 +0200 Subject: [PATCH 39/99] Solve 2025 day 4 part 2 --- .../eu/sim642/adventofcode2025/Day4.scala | 20 +++++++++++++++++-- .../eu/sim642/adventofcode2025/Day4Test.scala | 8 ++++++++ 2 files changed, 26 insertions(+), 2 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day4.scala b/src/main/scala/eu/sim642/adventofcode2025/Day4.scala index 73bb40ff..575726ae 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day4.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day4.scala @@ -6,7 +6,8 @@ import eu.sim642.adventofcodelib.pos.Pos object Day4 { - def countAccessibleRolls(grid: Grid[Char]): Int = { + // TODO: make this more like cellular automaton? + def accessibleRolls(grid: Grid[Char]): Seq[Pos] = { (for { (row, y) <- grid.view.zipWithIndex (cell, x) <- row.view.zipWithIndex @@ -14,7 +15,21 @@ object Day4 { if grid(pos) == '@' neighbors = Pos.allOffsets.map(pos + _).filter(grid.containsPos) if neighbors.count(grid(_) == '@') < 4 - } yield pos).size + } yield pos).toSeq + } + + def countAccessibleRolls(grid: Grid[Char]): Int = { + accessibleRolls(grid).size + } + + def countRemovableRolls(grid: Grid[Char]): Int = { + val accessible = accessibleRolls(grid) + if (accessible.isEmpty) + 0 + else { + val newGrid = accessible.foldLeft(grid)(_.updatedGrid(_, '.')) + accessible.size + countRemovableRolls(newGrid) + } } def parseGrid(input: String): Grid[Char] = input.linesIterator.map(_.toVector).toVector @@ -23,5 +38,6 @@ object Day4 { def main(args: Array[String]): Unit = { println(countAccessibleRolls(parseGrid(input))) + println(countRemovableRolls(parseGrid(input))) } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day4Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day4Test.scala index 0437c7c7..bfe56585 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day4Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day4Test.scala @@ -24,4 +24,12 @@ class Day4Test extends AnyFunSuite { test("Part 1 input answer") { assert(countAccessibleRolls(parseGrid(input)) == 1527) } + + test("Part 2 examples") { + assert(countRemovableRolls(parseGrid(exampleInput)) == 43) + } + + test("Part 2 input answer") { + assert(countRemovableRolls(parseGrid(input)) == 8690) + } } From 8eb8a821f7cfe29888e60e41ae6b2a1203d4ab24 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Fri, 5 Dec 2025 07:18:15 +0200 Subject: [PATCH 40/99] Solve 2025 day 5 part 1 --- .../eu/sim642/adventofcode2025/day5.txt | 1183 +++++++++++++++++ .../eu/sim642/adventofcode2025/Day5.scala | 30 + .../eu/sim642/adventofcode2025/Day5Test.scala | 28 + 3 files changed, 1241 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2025/day5.txt create mode 100644 src/main/scala/eu/sim642/adventofcode2025/Day5.scala create mode 100644 src/test/scala/eu/sim642/adventofcode2025/Day5Test.scala diff 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+36303214253904 +77113739462114 +332613040134789 +368179871295577 +54500507778458 +559819181914339 +359024060500704 +142775441258314 +555929172898758 +234335170287736 +432996614204002 +265211936254785 +219076815767968 +470376747245611 +195650968848679 +186443234315411 +531724905067097 diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day5.scala b/src/main/scala/eu/sim642/adventofcode2025/Day5.scala new file mode 100644 index 00000000..9fe59b4a --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcode2025/Day5.scala @@ -0,0 +1,30 @@ +package eu.sim642.adventofcode2025 + +import eu.sim642.adventofcode2016.Day20.Interval + +object Day5 { + + case class Database(fresh: Seq[Interval], available: Seq[Long]) + + def countFreshAvailable(database: Database): Int = { + val Database(fresh, available) = database + available.count(id => fresh.exists(_.contains(id))) + } + + def parseInterval(s: String): Interval = s match { + case s"$i-$j" => Interval(i.toLong, j.toLong) + } + + def parseDatabase(input: String): Database = input match { + case s"$freshStr\n\n$availableStr" => + val fresh = freshStr.linesIterator.map(parseInterval).toSeq + val available = availableStr.linesIterator.map(_.toLong).toSeq + Database(fresh, available) + } + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day5.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(countFreshAvailable(parseDatabase(input))) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day5Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day5Test.scala new file mode 100644 index 00000000..45136d30 --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2025/Day5Test.scala @@ -0,0 +1,28 @@ +package eu.sim642.adventofcode2025 + +import Day5._ +import org.scalatest.funsuite.AnyFunSuite + +class Day5Test extends AnyFunSuite { + + val exampleInput = + """3-5 + |10-14 + |16-20 + |12-18 + | + |1 + |5 + |8 + |11 + |17 + |32""".stripMargin + + test("Part 1 examples") { + assert(countFreshAvailable(parseDatabase(exampleInput)) == 3) + } + + test("Part 1 input answer") { + assert(countFreshAvailable(parseDatabase(input)) == 679) + } +} From da006272e2fe08e26fb8ce63e97e529d67e3a6e0 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Fri, 5 Dec 2025 07:20:59 +0200 Subject: [PATCH 41/99] Solve 2025 day 5 part 2 --- src/main/scala/eu/sim642/adventofcode2025/Day5.scala | 7 ++++++- src/test/scala/eu/sim642/adventofcode2025/Day5Test.scala | 8 ++++++++ 2 files changed, 14 insertions(+), 1 deletion(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day5.scala b/src/main/scala/eu/sim642/adventofcode2025/Day5.scala index 9fe59b4a..16408e86 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day5.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day5.scala @@ -1,6 +1,6 @@ package eu.sim642.adventofcode2025 -import eu.sim642.adventofcode2016.Day20.Interval +import eu.sim642.adventofcode2016.Day20.{Interval, mergeIntervals} object Day5 { @@ -11,6 +11,10 @@ object Day5 { available.count(id => fresh.exists(_.contains(id))) } + def countFresh(database: Database): Long = { + mergeIntervals(database.fresh).map(_.size).sum + } + def parseInterval(s: String): Interval = s match { case s"$i-$j" => Interval(i.toLong, j.toLong) } @@ -26,5 +30,6 @@ object Day5 { def main(args: Array[String]): Unit = { println(countFreshAvailable(parseDatabase(input))) + println(countFresh(parseDatabase(input))) } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day5Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day5Test.scala index 45136d30..63192baf 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day5Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day5Test.scala @@ -25,4 +25,12 @@ class Day5Test extends AnyFunSuite { test("Part 1 input answer") { assert(countFreshAvailable(parseDatabase(input)) == 679) } + + test("Part 2 examples") { + assert(countFresh(parseDatabase(exampleInput)) == 14) + } + + test("Part 2 input answer") { + assert(countFresh(parseDatabase(input)) == 358155203664116L) + } } From e55596cf8194c0317b7604ad37eb2970f5c67f0e Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sat, 6 Dec 2025 08:29:10 +0200 Subject: [PATCH 42/99] Solve 2025 day 6 part 1 --- .../eu/sim642/adventofcode2025/day6.txt | 5 +++ .../eu/sim642/adventofcode2025/Day6.scala | 44 +++++++++++++++++++ .../eu/sim642/adventofcode2025/Day6Test.scala | 21 +++++++++ 3 files changed, 70 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2025/day6.txt create mode 100644 src/main/scala/eu/sim642/adventofcode2025/Day6.scala create mode 100644 src/test/scala/eu/sim642/adventofcode2025/Day6Test.scala diff --git a/src/main/resources/eu/sim642/adventofcode2025/day6.txt b/src/main/resources/eu/sim642/adventofcode2025/day6.txt new file mode 100644 index 00000000..0d46e4b4 --- /dev/null +++ b/src/main/resources/eu/sim642/adventofcode2025/day6.txt @@ -0,0 +1,5 @@ +91 23 61 16 57 74 65 739 11 98 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+ * + * * * * + * * * + * * * * * * + + + * + + * * * * * * + * * + + + + + + + * + * * + + + + * * * * * + * * * + + * * * * * * + + * * * + * * + * + * * * * * + * + * + + * + * + + * * + * * * + + + * * * + + * + + * + + + + * + * + * * * * + * + * + + + + * * + + * * + + + * * + + + + + + + + * * + + + + + + + * * + + + * + + + * + + + * + * + * * + + * + * + + + * + + + + + * + + + + + + * * + * + + + * * + + + + * + * * + + * * + * + + + * * + * + * + * + * * * * * * + + * * + * + + + + + + + * + * * + + * + * * + * + * * * * + * * * * * + * * + + * * + + + * * + * + * + * + + * * + + + + + * + + + + + + * + + + * + + * * + * + + + * + + * + + + + + + * + * + * + + + + + * + + * + * + + + + * + + * * + + * + * + * * * + + + * + * * * * + + * + * * * + * * + + * * * * * + + * * * * * + * * * + * * + * + * + + * * + * * * + + * + + + + * * * * * + * * * + * + * + * * + + * + * + * * * * * * * + * * + * * + * * * * * * * * + * + * * * + * * + + * * + * * + + * + * * + * * * + * * * + + * + * * * * + + * + + * * + + + + * * + + * * * * * + + * + + * + + + * * * + + + * * * + * * + * * * + + + + * + + * + * * * + * + * * * * * * * * + * + * * + + + * * * * * * * + + * + * + + + + * * * * * * * * + * + * * + * * * + * * + * * + + * + + * * * + + + + * * + * + + + * * * * + * + + + + * + + + * * diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day6.scala b/src/main/scala/eu/sim642/adventofcode2025/Day6.scala new file mode 100644 index 00000000..98560b6e --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcode2025/Day6.scala @@ -0,0 +1,44 @@ +package eu.sim642.adventofcode2025 + +import Day6.ProblemKind._ + +object Day6 { + + enum ProblemKind { + case Add + case Multiply + } + + case class Problem(nums: Seq[Int], problemKind: ProblemKind) { + def answer: Long = problemKind match { + case Add => nums.map(_.toLong).sum + case Multiply => nums.map(_.toLong).product + } + } + + def sumAnswers(problems: Seq[Problem]): Long = { + problems.map(_.answer).sum + } + + def parseProblemKind(s: String): ProblemKind = s match { + case "+" => Add + case "*" => Multiply + } + + def parseProblems(input: String): Seq[Problem] = { + input + .linesIterator + .map(_.trim.split(" +").toSeq) + .toSeq + .transpose + .map(s => Problem(s.init.map(_.toInt), parseProblemKind(s.last))) + } + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day6.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(sumAnswers(parseProblems(input))) + + // part 1: 1615951811 - too low (Int overflowed in Problem#answer) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day6Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day6Test.scala new file mode 100644 index 00000000..adbd4518 --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2025/Day6Test.scala @@ -0,0 +1,21 @@ +package eu.sim642.adventofcode2025 + +import Day6._ +import org.scalatest.funsuite.AnyFunSuite + +class Day6Test extends AnyFunSuite { + + val exampleInput = + """123 328 51 64 + | 45 64 387 23 + | 6 98 215 314 + |* + * +""".stripMargin + + test("Part 1 examples") { + assert(sumAnswers(parseProblems(exampleInput)) == 4277556) + } + + test("Part 1 input answer") { + assert(sumAnswers(parseProblems(input)) == 5361735137219L) + } +} From f30b7c3a0cdaa6b2408b6f946a8f37b9bba817ab Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sat, 6 Dec 2025 08:47:42 +0200 Subject: [PATCH 43/99] Solve 2025 day 6 part 2 --- .../eu/sim642/adventofcode2025/Day6.scala | 49 ++++++++++++++++--- .../eu/sim642/adventofcode2025/Day6Test.scala | 12 ++++- 2 files changed, 51 insertions(+), 10 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day6.scala b/src/main/scala/eu/sim642/adventofcode2025/Day6.scala index 98560b6e..e04881bf 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day6.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day6.scala @@ -25,19 +25,52 @@ object Day6 { case "*" => Multiply } - def parseProblems(input: String): Seq[Problem] = { - input - .linesIterator - .map(_.trim.split(" +").toSeq) - .toSeq - .transpose - .map(s => Problem(s.init.map(_.toInt), parseProblemKind(s.last))) + trait Part { + def parseProblems(input: String): Seq[Problem] + } + + object Part1 extends Part { + override def parseProblems(input: String): Seq[Problem] = { + input + .linesIterator + .map(_.trim.split(" +").toSeq) + .toSeq + .transpose + .map(s => Problem(s.init.map(_.toInt), parseProblemKind(s.last))) + } + } + + object Part2 extends Part { + override def parseProblems(input: String): Seq[Problem] = { + val lines = input.linesIterator.toSeq + val maxLength = lines.map(_.length).max + val paddedLines = lines.map(_.padTo(maxLength, ' ')) // pad because test code has trimmed trailing whitespace + val cols = paddedLines.transpose + + // TODO: split on Seq? + def helper(cols: Seq[Seq[Char]]): List[Problem] = { + val (problemCols, newCols) = cols.span(!_.forall(_ == ' ')) + val problemKind = parseProblemKind(problemCols.head.last.toString) + val nums = problemCols.map(_.init.mkString("").trim.toInt) + val problem = Problem(nums, problemKind) + val rest = { + if (newCols.isEmpty) + Nil + else + helper(newCols.tail) + } + problem :: rest + } + + helper(cols) + } } lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day6.txt")).mkString.trim def main(args: Array[String]): Unit = { - println(sumAnswers(parseProblems(input))) + println(sumAnswers(Part1.parseProblems(input))) + println(sumAnswers(Part2.parseProblems(input))) // part 1: 1615951811 - too low (Int overflowed in Problem#answer) } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day6Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day6Test.scala index adbd4518..561f32bc 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day6Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day6Test.scala @@ -12,10 +12,18 @@ class Day6Test extends AnyFunSuite { |* + * +""".stripMargin test("Part 1 examples") { - assert(sumAnswers(parseProblems(exampleInput)) == 4277556) + assert(sumAnswers(Part1.parseProblems(exampleInput)) == 4277556) } test("Part 1 input answer") { - assert(sumAnswers(parseProblems(input)) == 5361735137219L) + assert(sumAnswers(Part1.parseProblems(input)) == 5361735137219L) + } + + test("Part 2 examples") { + assert(sumAnswers(Part2.parseProblems(exampleInput)) == 3263827) + } + + test("Part 2 input answer") { + assert(sumAnswers(Part2.parseProblems(input)) == 11744693538946L) } } From 82ce962f5495b7b7e6bbd40647c5bba62bf523ca Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 7 Dec 2025 08:39:03 +0200 Subject: [PATCH 44/99] Solve 2025 day 7 part 1 --- .../eu/sim642/adventofcode2025/day7.txt | 142 ++++++++++++++++++ .../eu/sim642/adventofcode2025/Day7.scala | 37 +++++ .../eu/sim642/adventofcode2025/Day7Test.scala | 33 ++++ 3 files changed, 212 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2025/day7.txt create mode 100644 src/main/scala/eu/sim642/adventofcode2025/Day7.scala create mode 100644 src/test/scala/eu/sim642/adventofcode2025/Day7Test.scala diff --git a/src/main/resources/eu/sim642/adventofcode2025/day7.txt b/src/main/resources/eu/sim642/adventofcode2025/day7.txt new file mode 100644 index 00000000..f2f6a6b6 --- /dev/null +++ b/src/main/resources/eu/sim642/adventofcode2025/day7.txt @@ -0,0 +1,142 @@ +......................................................................S...................................................................... +............................................................................................................................................. +......................................................................^...................................................................... +............................................................................................................................................. 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+............................................................................................................................................. +..^...^.^...^.......^.^.^.^.....^.^.^.....^.^.^...^.^.^.^...^.^.^.^...^.^.^.^.^.^.^.^...^.^.^...^.^...^.^.^.^...^.^.^...^.^...^.^...^.....^.. +............................................................................................................................................. +.^.^.^.^.^.^.^.....^.^.^.^.^.^.^.^.^.^.^.^...^.^.......^...^.^.^.^...^.^.^...^.^...^.^.^.^.^.^.^.^.^.^.^.^.^.^.^.^...^.^.^.^...^.^.^.^.....^. +............................................................................................................................................. diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day7.scala b/src/main/scala/eu/sim642/adventofcode2025/Day7.scala new file mode 100644 index 00000000..9d08871b --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcode2025/Day7.scala @@ -0,0 +1,37 @@ +package eu.sim642.adventofcode2025 + +import eu.sim642.adventofcodelib.Grid +import eu.sim642.adventofcodelib.GridImplicits.* +import eu.sim642.adventofcodelib.graph.{BFS, GraphTraversal, UnitNeighbors} +import eu.sim642.adventofcodelib.pos.Pos + +object Day7 { + + private val cellOffsets = Map( + 'S' -> Seq(Pos(0, 1)), + '.' -> Seq(Pos(0, 1)), + '^' -> Seq(Pos(-1, 0), Pos(1, 0)), + ) + + def countBeamSplits(grid: Grid[Char]): Int = { + val graphTraversal = new GraphTraversal[Pos] with UnitNeighbors[Pos] { + override val startNode: Pos = grid.posOf('S') + + override def unitNeighbors(pos: Pos): IterableOnce[Pos] = { + cellOffsets(grid(pos)).map(pos + _).filter(grid.containsPos) + } + } + + BFS.traverse(graphTraversal) + .nodes + .count(pos => grid(pos) == '^') + } + + def parseGrid(input: String): Grid[Char] = input.linesIterator.map(_.toVector).toVector + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day7.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(countBeamSplits(parseGrid(input))) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day7Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day7Test.scala new file mode 100644 index 00000000..78eca815 --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2025/Day7Test.scala @@ -0,0 +1,33 @@ +package eu.sim642.adventofcode2025 + +import Day7._ +import org.scalatest.funsuite.AnyFunSuite + +class Day7Test extends AnyFunSuite { + + val exampleInput = + """.......S....... + |............... + |.......^....... + |............... + |......^.^...... + |............... + |.....^.^.^..... + |............... + |....^.^...^.... + |............... + |...^.^...^.^... + |............... + |..^...^.....^.. + |............... + |.^.^.^.^.^...^. + |...............""".stripMargin + + test("Part 1 examples") { + assert(countBeamSplits(parseGrid(exampleInput)) == 21) + } + + test("Part 1 input answer") { + assert(countBeamSplits(parseGrid(input)) == 1587) + } +} From 1d9cb46aab65d8afc1111766891711bae9e079de Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 7 Dec 2025 08:51:37 +0200 Subject: [PATCH 45/99] Solve 2025 day 7 part 2 --- .../eu/sim642/adventofcode2025/Day7.scala | 27 +++++++++++++++++++ .../eu/sim642/adventofcode2025/Day7Test.scala | 8 ++++++ 2 files changed, 35 insertions(+) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day7.scala b/src/main/scala/eu/sim642/adventofcode2025/Day7.scala index 9d08871b..9118de97 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day7.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day7.scala @@ -5,6 +5,8 @@ import eu.sim642.adventofcodelib.GridImplicits.* import eu.sim642.adventofcodelib.graph.{BFS, GraphTraversal, UnitNeighbors} import eu.sim642.adventofcodelib.pos.Pos +import scala.annotation.tailrec + object Day7 { private val cellOffsets = Map( @@ -27,11 +29,36 @@ object Day7 { .count(pos => grid(pos) == '^') } + def countTimelines(grid: Grid[Char]): Long = { + + @tailrec + def helper(y: Int, xs: Map[Int, Long]): Long = { + if (y >= grid.size) + xs.values.sum + else { + val newXs = + (for { + (x, count) <- xs.view + pos = Pos(x, y) + offset <- cellOffsets(grid(pos)) + newPos = pos + offset + } yield newPos.x -> count).groupMapReduce(_._1)(_._2)(_ + _) + + helper(y + 1, newXs) + } + } + + helper(0, Map(grid.posOf('S').x -> 1)) + } + def parseGrid(input: String): Grid[Char] = input.linesIterator.map(_.toVector).toVector lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day7.txt")).mkString.trim def main(args: Array[String]): Unit = { println(countBeamSplits(parseGrid(input))) + println(countTimelines(parseGrid(input))) + + // part 2: 2012790981 (Int overflowed in countTimelines) } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day7Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day7Test.scala index 78eca815..a2fec4d5 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day7Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day7Test.scala @@ -30,4 +30,12 @@ class Day7Test extends AnyFunSuite { test("Part 1 input answer") { assert(countBeamSplits(parseGrid(input)) == 1587) } + + test("Part 2 examples") { + assert(countTimelines(parseGrid(exampleInput)) == 40) + } + + test("Part 2 input answer") { + assert(countTimelines(parseGrid(input)) == 5748679033029L) + } } From 42504dd704126302070bf05d1d6b155bf2bde2b3 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 7 Dec 2025 09:20:00 +0200 Subject: [PATCH 46/99] Clean up 2025 day 7 a bit --- src/main/scala/eu/sim642/adventofcode2025/Day7.scala | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day7.scala b/src/main/scala/eu/sim642/adventofcode2025/Day7.scala index 9118de97..688f543a 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day7.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day7.scala @@ -26,7 +26,7 @@ object Day7 { BFS.traverse(graphTraversal) .nodes - .count(pos => grid(pos) == '^') + .count(grid(_) == '^') } def countTimelines(grid: Grid[Char]): Long = { @@ -48,7 +48,8 @@ object Day7 { } } - helper(0, Map(grid.posOf('S').x -> 1)) + val startPos = grid.posOf('S') + helper(startPos.y, Map(startPos.x -> 1)) } def parseGrid(input: String): Grid[Char] = input.linesIterator.map(_.toVector).toVector From f74bfddc925386ba78ed7728872e529386403ce1 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 8 Dec 2025 07:39:21 +0200 Subject: [PATCH 47/99] Solve 2025 day 8 part 1 --- .../eu/sim642/adventofcode2025/day8.txt | 1000 +++++++++++++++++ .../eu/sim642/adventofcode2025/Day8.scala | 78 ++ .../eu/sim642/adventofcode2025/Day8Test.scala | 37 + 3 files changed, 1115 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2025/day8.txt create mode 100644 src/main/scala/eu/sim642/adventofcode2025/Day8.scala create mode 100644 src/test/scala/eu/sim642/adventofcode2025/Day8Test.scala diff --git 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+14734,32542,57111 +15628,71608,51104 +13179,98114,90116 +56224,98078,69900 +19501,15471,865 +20509,39055,59319 diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala new file mode 100644 index 00000000..0f98fd1e --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala @@ -0,0 +1,78 @@ +package eu.sim642.adventofcode2025 + +import eu.sim642.adventofcodelib.pos.Pos3 +import eu.sim642.adventofcodelib.IteratorImplicits._ + +import scala.annotation.tailrec + +object Day8 { + + extension (pos: Pos3) { + infix def euclideanDistance(that: Pos3): Double = { + val d = that - pos + math.sqrt(d.x.toDouble * d.x + d.y.toDouble * d.y + d.z.toDouble * d.z) + } + } + + class UnionFind[A](val reprs: Map[A, A]) { + // TODO: optimize + + def this(items: Seq[A]) = { + this(items.map(x => x -> x).toMap) + } + + @tailrec + final def findRepr(x: A): A = { + val repr = reprs(x) + if (x == repr) + repr + else + findRepr(repr) + } + + def sameRepr(x: A, y: A): Boolean = + findRepr(x) == findRepr(y) + + def unioned(x: A, y: A): UnionFind[A] = { + val xRepr = findRepr(x) + val yRepr = findRepr(y) + new UnionFind(reprs + (yRepr -> xRepr)) + } + + def groups(): Seq[Seq[A]] = + reprs.keys.groupBy(findRepr).values.map(_.toSeq).toSeq + + override def toString: String = reprs.toString() + } + + def multiplySizesAfter(junctionBoxes: Seq[Pos3], after: Int = 1000, sizes: Int = 3): Int = { + val closestPairs = + junctionBoxes.combinations(2) + .map({ case Seq(p1, p2) => (p1, p2) }) + .toSeq + .sortBy(_ euclideanDistance _) + + val ufAfter = closestPairs.iterator + .scanLeft(new UnionFind(junctionBoxes))({ case (uf, (p1, p2)) => + uf.unioned(p1, p2) + })(after) + + ufAfter.groups() + .map(_.size) + .sorted(using Ordering.Int.reverse) + .take(sizes) + .product + } + + def parseJunctionBox(s: String): Pos3 = s match { + case s"$x,$y,$z" => Pos3(x.toInt, y.toInt, z.toInt) + } + + def parseJunctionBoxes(input: String): Seq[Pos3] = input.linesIterator.map(parseJunctionBox).toSeq + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day8.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(multiplySizesAfter(parseJunctionBoxes(input))) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day8Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day8Test.scala new file mode 100644 index 00000000..2512f1ae --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2025/Day8Test.scala @@ -0,0 +1,37 @@ +package eu.sim642.adventofcode2025 + +import Day8._ +import org.scalatest.funsuite.AnyFunSuite + +class Day8Test extends AnyFunSuite { + + val exampleInput = + """162,817,812 + |57,618,57 + |906,360,560 + |592,479,940 + |352,342,300 + |466,668,158 + |542,29,236 + |431,825,988 + |739,650,466 + |52,470,668 + |216,146,977 + |819,987,18 + |117,168,530 + |805,96,715 + |346,949,466 + |970,615,88 + |941,993,340 + |862,61,35 + |984,92,344 + |425,690,689""".stripMargin + + test("Part 1 examples") { + assert(multiplySizesAfter(parseJunctionBoxes(exampleInput), after = 10) == 40) + } + + test("Part 1 input answer") { + assert(multiplySizesAfter(parseJunctionBoxes(input)) == 52668) + } +} From d0d66a92656e67160ee18860caefb4374e0b3328 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 8 Dec 2025 07:50:42 +0200 Subject: [PATCH 48/99] Solve 2025 day 8 part 2 --- .../eu/sim642/adventofcode2025/Day8.scala | 24 ++++++++++++++++++- .../eu/sim642/adventofcode2025/Day8Test.scala | 8 +++++++ 2 files changed, 31 insertions(+), 1 deletion(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala index 0f98fd1e..4d162f1a 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala @@ -64,6 +64,27 @@ object Day8 { .product } + // TODO: deduplicate + def multiplyLastXs(junctionBoxes: Seq[Pos3]): Int = { + val closestPairs = + junctionBoxes.combinations(2) + .map({ case Seq(p1, p2) => (p1, p2) }) + .toSeq + .sortBy(_ euclideanDistance _) + + // TODO: clean up + val size = junctionBoxes.size + val ufAfter = closestPairs.iterator + .scanLeft((new UnionFind(junctionBoxes), 0))({ case ((uf, edges), (p1, p2)) => + if (uf.sameRepr(p1, p2)) + (uf, edges) + else + (uf.unioned(p1, p2), edges + 1) + }).tail.zip(closestPairs).find(_._1._2 == size - 1).get._2 + + ufAfter._1.x * ufAfter._2.x + } + def parseJunctionBox(s: String): Pos3 = s match { case s"$x,$y,$z" => Pos3(x.toInt, y.toInt, z.toInt) } @@ -73,6 +94,7 @@ object Day8 { lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day8.txt")).mkString.trim def main(args: Array[String]): Unit = { - println(multiplySizesAfter(parseJunctionBoxes(input))) + //println(multiplySizesAfter(parseJunctionBoxes(input))) + println(multiplyLastXs(parseJunctionBoxes(input))) } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day8Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day8Test.scala index 2512f1ae..0e58baa6 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day8Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day8Test.scala @@ -34,4 +34,12 @@ class Day8Test extends AnyFunSuite { test("Part 1 input answer") { assert(multiplySizesAfter(parseJunctionBoxes(input)) == 52668) } + + test("Part 2 examples") { + assert(multiplyLastXs(parseJunctionBoxes(exampleInput)) == 25272) + } + + test("Part 2 input answer") { + assert(multiplyLastXs(parseJunctionBoxes(input)) == 1474050600) + } } From 8702586c1595b3b60d379c6009506215bc770b3a Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 8 Dec 2025 08:17:17 +0200 Subject: [PATCH 49/99] Optimize combinations in 2025 day 8 --- .../eu/sim642/adventofcode2025/Day8.scala | 25 +++++++++++-------- 1 file changed, 14 insertions(+), 11 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala index 4d162f1a..a4d0552f 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala @@ -14,6 +14,17 @@ object Day8 { } } + def closestPairsSeq(junctionBoxes: Seq[Pos3]): Seq[(Pos3, Pos3)] = { + //noinspection ConvertibleToMethodValue + (for { + // faster than combinations(2) + (p1, i) <- junctionBoxes.iterator.zipWithIndex + p2 <- junctionBoxes.view.slice(i + 1, junctionBoxes.size).iterator + } yield (p1, p2)) + .toSeq + .sortBy(_ euclideanDistance _) + } + class UnionFind[A](val reprs: Map[A, A]) { // TODO: optimize @@ -46,11 +57,7 @@ object Day8 { } def multiplySizesAfter(junctionBoxes: Seq[Pos3], after: Int = 1000, sizes: Int = 3): Int = { - val closestPairs = - junctionBoxes.combinations(2) - .map({ case Seq(p1, p2) => (p1, p2) }) - .toSeq - .sortBy(_ euclideanDistance _) + val closestPairs = closestPairsSeq(junctionBoxes) val ufAfter = closestPairs.iterator .scanLeft(new UnionFind(junctionBoxes))({ case (uf, (p1, p2)) => @@ -66,11 +73,7 @@ object Day8 { // TODO: deduplicate def multiplyLastXs(junctionBoxes: Seq[Pos3]): Int = { - val closestPairs = - junctionBoxes.combinations(2) - .map({ case Seq(p1, p2) => (p1, p2) }) - .toSeq - .sortBy(_ euclideanDistance _) + val closestPairs = closestPairsSeq(junctionBoxes) // TODO: clean up val size = junctionBoxes.size @@ -94,7 +97,7 @@ object Day8 { lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day8.txt")).mkString.trim def main(args: Array[String]): Unit = { - //println(multiplySizesAfter(parseJunctionBoxes(input))) + println(multiplySizesAfter(parseJunctionBoxes(input))) println(multiplyLastXs(parseJunctionBoxes(input))) } } From 489fc5a4446ec25154054eec649b8f4154e7623f Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 8 Dec 2025 08:23:05 +0200 Subject: [PATCH 50/99] Optimize Euclidean distance (re)computuation in 2025 day 8 --- src/main/scala/eu/sim642/adventofcode2025/Day8.scala | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala index a4d0552f..167c4bef 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala @@ -20,9 +20,10 @@ object Day8 { // faster than combinations(2) (p1, i) <- junctionBoxes.iterator.zipWithIndex p2 <- junctionBoxes.view.slice(i + 1, junctionBoxes.size).iterator - } yield (p1, p2)) + } yield (p1, p2) -> (p1 euclideanDistance p2)) .toSeq - .sortBy(_ euclideanDistance _) + .sortBy(_._2) + .map(_._1) } class UnionFind[A](val reprs: Map[A, A]) { From ea8d153ce5fbdd2142e353c543285fea6d45950d Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 8 Dec 2025 19:41:19 +0200 Subject: [PATCH 51/99] Move UnionFind to library --- .../eu/sim642/adventofcode2025/Day8.scala | 34 ++----------------- .../eu/sim642/adventofcodelib/UnionFind.scala | 34 +++++++++++++++++++ 2 files changed, 36 insertions(+), 32 deletions(-) create mode 100644 src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala index 167c4bef..8aceeb51 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala @@ -1,7 +1,8 @@ package eu.sim642.adventofcode2025 import eu.sim642.adventofcodelib.pos.Pos3 -import eu.sim642.adventofcodelib.IteratorImplicits._ +import eu.sim642.adventofcodelib.IteratorImplicits.* +import eu.sim642.adventofcodelib.UnionFind import scala.annotation.tailrec @@ -26,37 +27,6 @@ object Day8 { .map(_._1) } - class UnionFind[A](val reprs: Map[A, A]) { - // TODO: optimize - - def this(items: Seq[A]) = { - this(items.map(x => x -> x).toMap) - } - - @tailrec - final def findRepr(x: A): A = { - val repr = reprs(x) - if (x == repr) - repr - else - findRepr(repr) - } - - def sameRepr(x: A, y: A): Boolean = - findRepr(x) == findRepr(y) - - def unioned(x: A, y: A): UnionFind[A] = { - val xRepr = findRepr(x) - val yRepr = findRepr(y) - new UnionFind(reprs + (yRepr -> xRepr)) - } - - def groups(): Seq[Seq[A]] = - reprs.keys.groupBy(findRepr).values.map(_.toSeq).toSeq - - override def toString: String = reprs.toString() - } - def multiplySizesAfter(junctionBoxes: Seq[Pos3], after: Int = 1000, sizes: Int = 3): Int = { val closestPairs = closestPairsSeq(junctionBoxes) diff --git a/src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala b/src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala new file mode 100644 index 00000000..2acbe148 --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala @@ -0,0 +1,34 @@ +package eu.sim642.adventofcodelib + +import scala.annotation.tailrec + +class UnionFind[A](val reprs: Map[A, A]) { + // TODO: optimize + + def this(items: Seq[A]) = { + this(items.map(x => x -> x).toMap) + } + + @tailrec + final def findRepr(x: A): A = { + val repr = reprs(x) + if (x == repr) + repr + else + findRepr(repr) + } + + def sameRepr(x: A, y: A): Boolean = + findRepr(x) == findRepr(y) + + def unioned(x: A, y: A): UnionFind[A] = { + val xRepr = findRepr(x) + val yRepr = findRepr(y) + new UnionFind(reprs + (yRepr -> xRepr)) + } + + def groups(): Seq[Seq[A]] = + reprs.keys.groupBy(findRepr).values.map(_.toSeq).toSeq + + override def toString: String = reprs.toString() +} From d3401e95475df376fd0b74f27274bf336e26e2f7 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 8 Dec 2025 20:02:01 +0200 Subject: [PATCH 52/99] Extract Kruskal to library --- .../eu/sim642/adventofcode2025/Day8.scala | 26 ++++--------------- .../adventofcodelib/graph/Kruskal.scala | 19 ++++++++++++++ 2 files changed, 24 insertions(+), 21 deletions(-) create mode 100644 src/main/scala/eu/sim642/adventofcodelib/graph/Kruskal.scala diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala index 8aceeb51..2653c794 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala @@ -1,10 +1,8 @@ package eu.sim642.adventofcode2025 -import eu.sim642.adventofcodelib.pos.Pos3 import eu.sim642.adventofcodelib.IteratorImplicits.* -import eu.sim642.adventofcodelib.UnionFind - -import scala.annotation.tailrec +import eu.sim642.adventofcodelib.graph.Kruskal +import eu.sim642.adventofcodelib.pos.Pos3 object Day8 { @@ -29,11 +27,7 @@ object Day8 { def multiplySizesAfter(junctionBoxes: Seq[Pos3], after: Int = 1000, sizes: Int = 3): Int = { val closestPairs = closestPairsSeq(junctionBoxes) - - val ufAfter = closestPairs.iterator - .scanLeft(new UnionFind(junctionBoxes))({ case (uf, (p1, p2)) => - uf.unioned(p1, p2) - })(after) + val (ufAfter, _) = Kruskal.iterate(junctionBoxes, closestPairs)(after) ufAfter.groups() .map(_.size) @@ -45,18 +39,8 @@ object Day8 { // TODO: deduplicate def multiplyLastXs(junctionBoxes: Seq[Pos3]): Int = { val closestPairs = closestPairsSeq(junctionBoxes) - - // TODO: clean up - val size = junctionBoxes.size - val ufAfter = closestPairs.iterator - .scanLeft((new UnionFind(junctionBoxes), 0))({ case ((uf, edges), (p1, p2)) => - if (uf.sameRepr(p1, p2)) - (uf, edges) - else - (uf.unioned(p1, p2), edges + 1) - }).tail.zip(closestPairs).find(_._1._2 == size - 1).get._2 - - ufAfter._1.x * ufAfter._2.x + val lastPair = Kruskal.iterateEdges(junctionBoxes, closestPairs).last + lastPair._1.x * lastPair._2.x } def parseJunctionBox(s: String): Pos3 = s match { diff --git a/src/main/scala/eu/sim642/adventofcodelib/graph/Kruskal.scala b/src/main/scala/eu/sim642/adventofcodelib/graph/Kruskal.scala new file mode 100644 index 00000000..00d52232 --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcodelib/graph/Kruskal.scala @@ -0,0 +1,19 @@ +package eu.sim642.adventofcodelib.graph + +import eu.sim642.adventofcodelib.UnionFind + +object Kruskal { + + def iterate[A](nodes: Seq[A], sortedEdges: IterableOnce[(A, A)]): Iterator[(UnionFind[A], Option[(A, A)])] = { + sortedEdges.iterator + .scanLeft((new UnionFind(nodes), Option.empty[(A, A)]))({ case ((uf, _), edge@(p1, p2)) => + if (uf.sameRepr(p1, p2)) + (uf, None) + else + (uf.unioned(p1, p2), Some(edge)) + }) + } + + def iterateEdges[A](nodes: Seq[A], sortedEdges: IterableOnce[(A, A)]): Iterator[(A, A)] = + iterate(nodes, sortedEdges).flatMap(_._2).take(nodes.size - 1) +} From 00452ed174789926fba12d148578473aa58ff8e9 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 8 Dec 2025 20:07:25 +0200 Subject: [PATCH 53/99] Optimize 2025 day 8 by not sqrt-ing distance --- src/main/scala/eu/sim642/adventofcode2025/Day8.scala | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala index 2653c794..20a882bf 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala @@ -7,9 +7,9 @@ import eu.sim642.adventofcodelib.pos.Pos3 object Day8 { extension (pos: Pos3) { - infix def euclideanDistance(that: Pos3): Double = { + infix def euclideanDistanceSqr(that: Pos3): Long = { val d = that - pos - math.sqrt(d.x.toDouble * d.x + d.y.toDouble * d.y + d.z.toDouble * d.z) + d.x.toLong * d.x + d.y.toLong * d.y + d.z.toLong * d.z } } @@ -19,7 +19,7 @@ object Day8 { // faster than combinations(2) (p1, i) <- junctionBoxes.iterator.zipWithIndex p2 <- junctionBoxes.view.slice(i + 1, junctionBoxes.size).iterator - } yield (p1, p2) -> (p1 euclideanDistance p2)) + } yield (p1, p2) -> (p1 euclideanDistanceSqr p2)) // no need to sqrt distance just for sorting .toSeq .sortBy(_._2) .map(_._1) From 5ea88dbd53c960b04fca6d88a78e48c4e09fb5c4 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 8 Dec 2025 20:27:08 +0200 Subject: [PATCH 54/99] Optimize 2025 day 8 using PriorityQueue --- .../eu/sim642/adventofcode2025/Day8.scala | 28 +++++++++++++------ 1 file changed, 19 insertions(+), 9 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala index 20a882bf..5813cc1b 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala @@ -4,6 +4,8 @@ import eu.sim642.adventofcodelib.IteratorImplicits.* import eu.sim642.adventofcodelib.graph.Kruskal import eu.sim642.adventofcodelib.pos.Pos3 +import scala.collection.mutable + object Day8 { extension (pos: Pos3) { @@ -13,20 +15,28 @@ object Day8 { } } - def closestPairsSeq(junctionBoxes: Seq[Pos3]): Seq[(Pos3, Pos3)] = { - //noinspection ConvertibleToMethodValue - (for { + extension [A](queue: mutable.PriorityQueue[A]) { + // normal queue.iterator does not yield dequeue order + def dequeueIterator: Iterator[A] = new Iterator[A] { + override def hasNext: Boolean = queue.nonEmpty + + override def next(): A = queue.dequeue() + } + } + + def iterateClosestPairs(junctionBoxes: Seq[Pos3]): Iterator[(Pos3, Pos3)] = { + // it is faster to use a PriorityQueue than sort the Seq of all pairs because Kruskal will only need some closest pairs, not all + val queue = mutable.PriorityQueue.empty[((Pos3, Pos3), Long)](using Ordering.by(-_._2)) + for { // faster than combinations(2) (p1, i) <- junctionBoxes.iterator.zipWithIndex p2 <- junctionBoxes.view.slice(i + 1, junctionBoxes.size).iterator - } yield (p1, p2) -> (p1 euclideanDistanceSqr p2)) // no need to sqrt distance just for sorting - .toSeq - .sortBy(_._2) - .map(_._1) + } queue.enqueue((p1, p2) -> (p1 euclideanDistanceSqr p2)) // no need to sqrt distance just for sorting + queue.dequeueIterator.map(_._1) } def multiplySizesAfter(junctionBoxes: Seq[Pos3], after: Int = 1000, sizes: Int = 3): Int = { - val closestPairs = closestPairsSeq(junctionBoxes) + val closestPairs = iterateClosestPairs(junctionBoxes) val (ufAfter, _) = Kruskal.iterate(junctionBoxes, closestPairs)(after) ufAfter.groups() @@ -38,7 +48,7 @@ object Day8 { // TODO: deduplicate def multiplyLastXs(junctionBoxes: Seq[Pos3]): Int = { - val closestPairs = closestPairsSeq(junctionBoxes) + val closestPairs = iterateClosestPairs(junctionBoxes) val lastPair = Kruskal.iterateEdges(junctionBoxes, closestPairs).last lastPair._1.x * lastPair._2.x } From febab04fcb077d8c373a48ce2cc40a18508693db Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 8 Dec 2025 20:33:19 +0200 Subject: [PATCH 55/99] Clean up 2025 day 8 part 2 --- src/main/scala/eu/sim642/adventofcode2025/Day8.scala | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala index 5813cc1b..d721ea95 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala @@ -46,11 +46,10 @@ object Day8 { .product } - // TODO: deduplicate def multiplyLastXs(junctionBoxes: Seq[Pos3]): Int = { val closestPairs = iterateClosestPairs(junctionBoxes) - val lastPair = Kruskal.iterateEdges(junctionBoxes, closestPairs).last - lastPair._1.x * lastPair._2.x + val (p1, p2) = Kruskal.iterateEdges(junctionBoxes, closestPairs).last + p1.x * p2.x } def parseJunctionBox(s: String): Pos3 = s match { From f92b7aefbf37e3c7eaf6d5b03b55213dd425d20e Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 8 Dec 2025 21:07:28 +0200 Subject: [PATCH 56/99] Add union by rank to UnionFind --- .../eu/sim642/adventofcodelib/UnionFind.scala | 43 +++++++++++++------ 1 file changed, 29 insertions(+), 14 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala b/src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala index 2acbe148..bf30501e 100644 --- a/src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala +++ b/src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala @@ -1,34 +1,49 @@ package eu.sim642.adventofcodelib +import eu.sim642.adventofcodelib.UnionFind.Node + import scala.annotation.tailrec -class UnionFind[A](val reprs: Map[A, A]) { - // TODO: optimize +class UnionFind[A](val nodes: Map[A, Node[A]]) { - def this(items: Seq[A]) = { - this(items.map(x => x -> x).toMap) + def this(xs: Seq[A]) = { + this(xs.map(x => x -> Node(x, 1)).toMap) } @tailrec - final def findRepr(x: A): A = { - val repr = reprs(x) - if (x == repr) - repr + final def findReprNode(x: A): Node[A] = { + // TODO: path compression + val node = nodes(x) + if (x == node.parent) + node else - findRepr(repr) + findReprNode(node.parent) } + def findRepr(x: A): A = findReprNode(x).parent + def sameRepr(x: A, y: A): Boolean = findRepr(x) == findRepr(y) def unioned(x: A, y: A): UnionFind[A] = { - val xRepr = findRepr(x) - val yRepr = findRepr(y) - new UnionFind(reprs + (yRepr -> xRepr)) + val xNode = findReprNode(x) + val yNode = findReprNode(y) + val xRepr = xNode.parent + val yRepr = yNode.parent + if (xRepr == yRepr) // sameRepr inlined + this + else if (xNode.size >= yNode.size) + new UnionFind(nodes + (xRepr -> xNode.copy(size = xNode.size + yNode.size)) + (yRepr -> yNode.copy(parent = xRepr))) + else + new UnionFind(nodes + (yRepr -> yNode.copy(size = xNode.size + yNode.size)) + (xRepr -> xNode.copy(parent = yRepr))) } def groups(): Seq[Seq[A]] = - reprs.keys.groupBy(findRepr).values.map(_.toSeq).toSeq + nodes.keys.groupBy(findRepr).values.map(_.toSeq).toSeq + + override def toString: String = nodes.toString() +} - override def toString: String = reprs.toString() +object UnionFind { + case class Node[A](parent: A, size: Int) } From 618cfa9ccb1744bb3982f6d40f8fed0f30b15f45 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 8 Dec 2025 21:19:43 +0200 Subject: [PATCH 57/99] Optimize 2025 day 8 part 1 using sizes from UnionFind --- src/main/scala/eu/sim642/adventofcode2025/Day8.scala | 3 ++- src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala | 7 +++++-- 2 files changed, 7 insertions(+), 3 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala index d721ea95..610a998e 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day8.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day8.scala @@ -39,8 +39,9 @@ object Day8 { val closestPairs = iterateClosestPairs(junctionBoxes) val (ufAfter, _) = Kruskal.iterate(junctionBoxes, closestPairs)(after) - ufAfter.groups() + ufAfter.rootNodes .map(_.size) + .toSeq .sorted(using Ordering.Int.reverse) .take(sizes) .product diff --git a/src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala b/src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala index bf30501e..8cdd6270 100644 --- a/src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala +++ b/src/main/scala/eu/sim642/adventofcodelib/UnionFind.scala @@ -38,8 +38,11 @@ class UnionFind[A](val nodes: Map[A, Node[A]]) { new UnionFind(nodes + (yRepr -> yNode.copy(size = xNode.size + yNode.size)) + (xRepr -> xNode.copy(parent = yRepr))) } - def groups(): Seq[Seq[A]] = - nodes.keys.groupBy(findRepr).values.map(_.toSeq).toSeq + def components: Iterable[Iterable[A]] = + nodes.keys.groupBy(findRepr).values + + def rootNodes: Iterable[Node[A]] = + nodes.view.filter((x, node) => x == node.parent).values override def toString: String = nodes.toString() } From 2e607b758df8fab11e90fe6150e35f82afd7fa9e Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 9 Dec 2025 07:17:42 +0200 Subject: [PATCH 58/99] Solve 2025 day 9 part 1 --- .../eu/sim642/adventofcode2025/day9.txt | 496 ++++++++++++++++++ .../eu/sim642/adventofcode2025/Day9.scala | 27 + .../eu/sim642/adventofcode2025/Day9Test.scala | 25 + 3 files changed, 548 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b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala @@ -0,0 +1,27 @@ +package eu.sim642.adventofcode2025 + +import eu.sim642.adventofcodelib.box.Box +import eu.sim642.adventofcodelib.pos.Pos + +object Day9 { + + def largestArea(redTiles: Seq[Pos]): Long = { + (for { + // faster than combinations(2) + (p1, i) <- redTiles.iterator.zipWithIndex + p2 <- redTiles.view.slice(i + 1, redTiles.size).iterator + } yield Box.bounding(Seq(p1, p2)).size[Long]).max + } + + def parseRedTile(s: String): Pos = s match { + case s"$x,$y" => Pos(x.toInt, y.toInt) + } + + def parseRedTiles(input: String): Seq[Pos] = input.linesIterator.map(parseRedTile).toSeq + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day9.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(largestArea(parseRedTiles(input))) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala new file mode 100644 index 00000000..00f40548 --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala @@ -0,0 +1,25 @@ +package eu.sim642.adventofcode2025 + +import Day9._ +import org.scalatest.funsuite.AnyFunSuite + +class Day9Test extends AnyFunSuite { + + val exampleInput = + """7,1 + |11,1 + |11,7 + |9,7 + |9,5 + |2,5 + |2,3 + |7,3""".stripMargin + + test("Part 1 examples") { + assert(largestArea(parseRedTiles(exampleInput)) == 50) + } + + test("Part 1 input answer") { + assert(largestArea(parseRedTiles(input)) == 4729332959L) + } +} From d3caeacbda9a8306384467e07186b2950b2f1d82 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 9 Dec 2025 08:05:51 +0200 Subject: [PATCH 59/99] Solve 2025 day 9 part 2 --- .../eu/sim642/adventofcode2025/Day9.scala | 101 ++++++++++++++++-- .../eu/sim642/adventofcode2025/Day9Test.scala | 12 ++- 2 files changed, 104 insertions(+), 9 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala index c6f6a84d..e8b9b747 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala @@ -2,17 +2,103 @@ package eu.sim642.adventofcode2025 import eu.sim642.adventofcodelib.box.Box import eu.sim642.adventofcodelib.pos.Pos +import eu.sim642.adventofcodelib.SeqImplicits.* +import eu.sim642.adventofcodelib.graph.{BFS, GraphTraversal, UnitNeighbors} + +import scala.collection.immutable.SortedSet +import scala.collection.mutable object Day9 { - def largestArea(redTiles: Seq[Pos]): Long = { - (for { - // faster than combinations(2) - (p1, i) <- redTiles.iterator.zipWithIndex - p2 <- redTiles.view.slice(i + 1, redTiles.size).iterator - } yield Box.bounding(Seq(p1, p2)).size[Long]).max + trait Part { + def largestArea(redTiles: Seq[Pos]): Long + } + + object Part1 extends Part { + override def largestArea(redTiles: Seq[Pos]): Long = { + (for { + // faster than combinations(2) + (p1, i) <- redTiles.iterator.zipWithIndex + p2 <- redTiles.view.slice(i + 1, redTiles.size).iterator + } yield Box.bounding(Seq(p1, p2)).size[Long]).max + } + } + + object Part2 extends Part { + override def largestArea(redTiles: Seq[Pos]): Long = { + // TODO: clean up + // TODO: optimize (with polygon checks?) + val xs = redTiles.map(_.x).distinct.sorted + val ys = redTiles.map(_.y).distinct.sorted + //println(xs) + //println(ys) + + def mapPos(p: Pos): Pos = + Pos(xs.indexOf(p.x) * 2 + 1, ys.indexOf(p.y) * 2 + 1) // leave edge around for fill + + val grid = mutable.ArraySeq.fill(ys.size * 2 - 1 + 2, xs.size * 2 - 1 + 2)('.') + + for ((redTile1, redTile2) <- redTiles lazyZip redTiles.rotateLeft(1)) { + val gridPos1 = mapPos(redTile1) + val gridPos2 = mapPos(redTile2) + for (gridPos <- Box.bounding(Seq(gridPos1, gridPos2)).iterator) + grid(gridPos.y)(gridPos.x) = 'X' + } + + for (redTile <- redTiles) { + val gridPos = mapPos(redTile) + //println((redTile, gridPos)) + grid(gridPos.y)(gridPos.x) = '#' + } + + //for (row <- grid) { + // for (cell <- row) + // print(cell) + // println() + //} + + val graphTraversal = new GraphTraversal[Pos] with UnitNeighbors[Pos] { + override val startNode: Pos = Pos.zero + + override def unitNeighbors(pos: Pos): IterableOnce[Pos] = + Pos.axisOffsets.map(pos + _).filter(p => p.x >= 0 && p.y >= 0 && p.y < grid.size && p.x < grid(p.y).size && grid(p.y)(p.x) == '.') + } + + val outside = BFS.traverse(graphTraversal).nodes + + def isValid(box: Box): Boolean = { + val gridBox = Box(mapPos(box.min), mapPos(box.max)) + !gridBox.iterator.exists(outside) + } + + (for { + // faster than combinations(2) + (p1, i) <- redTiles.iterator.zipWithIndex + p2 <- redTiles.view.slice(i + 1, redTiles.size).iterator + box = Box.bounding(Seq(p1, p2)) + if isValid(box) + } yield box.size[Long]).max + } } + /*object Part2 extends Part { + override def largestArea(redTiles: Seq[Pos]): Long = { + + def isValid(box: Box): Boolean = { + val boxCorners = Seq(box.min, Pos(box.max.x, box.min.y), box.max, Pos(box.min.x, box.max.y)) + ??? + } + + (for { + // faster than combinations(2) + (p1, i) <- redTiles.iterator.zipWithIndex + p2 <- redTiles.view.slice(i + 1, redTiles.size).iterator + box = Box.bounding(Seq(p1, p2)) + if isValid(box) + } yield box.size[Long]).max + } + }*/ + def parseRedTile(s: String): Pos = s match { case s"$x,$y" => Pos(x.toInt, y.toInt) } @@ -22,6 +108,7 @@ object Day9 { lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day9.txt")).mkString.trim def main(args: Array[String]): Unit = { - println(largestArea(parseRedTiles(input))) + println(Part1.largestArea(parseRedTiles(input))) + println(Part2.largestArea(parseRedTiles(input))) } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala index 00f40548..a6342681 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala @@ -16,10 +16,18 @@ class Day9Test extends AnyFunSuite { |7,3""".stripMargin test("Part 1 examples") { - assert(largestArea(parseRedTiles(exampleInput)) == 50) + assert(Part1.largestArea(parseRedTiles(exampleInput)) == 50) } test("Part 1 input answer") { - assert(largestArea(parseRedTiles(input)) == 4729332959L) + assert(Part1.largestArea(parseRedTiles(input)) == 4729332959L) + } + + test("Part 2 examples") { + assert(Part2.largestArea(parseRedTiles(exampleInput)) == 24) + } + + ignore("Part 2 input answer") { // TODO: optimize (~8.5s) + assert(Part2.largestArea(parseRedTiles(input)) == 1474477524L) } } From af99f1afede3ae405caf63d94018a841b2998f7a Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 9 Dec 2025 08:28:21 +0200 Subject: [PATCH 60/99] Optimize 2025 day 9 part 2 using 2D prefix sums --- .../eu/sim642/adventofcode2025/Day9.scala | 23 ++++++++++++++++++- .../eu/sim642/adventofcode2025/Day9Test.scala | 2 +- 2 files changed, 23 insertions(+), 2 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala index e8b9b747..54d691d1 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala @@ -66,9 +66,30 @@ object Day9 { val outside = BFS.traverse(graphTraversal).nodes + val outsidePrefix = mutable.ArraySeq.fill(ys.size * 2 - 1 + 2, xs.size * 2 - 1 + 2)(0) + for (y <- outsidePrefix.indices) { + for (x <- outsidePrefix(y).indices) { + outsidePrefix(y)(x) = + (if (y >= 1) outsidePrefix(y - 1)(x) else 0) + + (if (x >= 1) outsidePrefix(y)(x - 1) else 0) - + (if (x >= 1 && y >= 1) outsidePrefix(y - 1)(x - 1) else 0) + + (if (outside(Pos(x, y))) 1 else 0) + } + } + + //for (row <- outsidePrefix) { + // for (cell <- row) + // print(s"$cell\t") + // println() + //} + def isValid(box: Box): Boolean = { val gridBox = Box(mapPos(box.min), mapPos(box.max)) - !gridBox.iterator.exists(outside) + //!gridBox.iterator.exists(outside) + (outsidePrefix(gridBox.max.y)(gridBox.max.x) - + outsidePrefix(gridBox.min.y - 1)(gridBox.max.x) - + outsidePrefix(gridBox.max.y)(gridBox.min.x - 1) + + outsidePrefix(gridBox.min.y - 1)(gridBox.min.x - 1)) == 0 } (for { diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala index a6342681..7d8c872a 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala @@ -27,7 +27,7 @@ class Day9Test extends AnyFunSuite { assert(Part2.largestArea(parseRedTiles(exampleInput)) == 24) } - ignore("Part 2 input answer") { // TODO: optimize (~8.5s) + test("Part 2 input answer") { assert(Part2.largestArea(parseRedTiles(input)) == 1474477524L) } } From 40de16e43c676af1582fa49d05159329c7ef04b0 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 9 Dec 2025 19:41:36 +0200 Subject: [PATCH 61/99] Extract common parts code in 2025 day 9 --- .../eu/sim642/adventofcode2025/Day9.scala | 27 ++++++++++--------- 1 file changed, 14 insertions(+), 13 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala index 54d691d1..acfa91c1 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala @@ -11,21 +11,28 @@ import scala.collection.mutable object Day9 { trait Part { - def largestArea(redTiles: Seq[Pos]): Long - } + def makeIsValid(redTiles: Seq[Pos]): Box => Boolean + + def largestArea(redTiles: Seq[Pos]): Long = { + val isValid = makeIsValid(redTiles) - object Part1 extends Part { - override def largestArea(redTiles: Seq[Pos]): Long = { (for { // faster than combinations(2) (p1, i) <- redTiles.iterator.zipWithIndex p2 <- redTiles.view.slice(i + 1, redTiles.size).iterator - } yield Box.bounding(Seq(p1, p2)).size[Long]).max + box = Box.bounding(Seq(p1, p2)) + if isValid(box) + } yield box.size[Long]).max } } + object Part1 extends Part { + override def makeIsValid(redTiles: Seq[Pos]): Box => Boolean = + _ => true + } + object Part2 extends Part { - override def largestArea(redTiles: Seq[Pos]): Long = { + override def makeIsValid(redTiles: Seq[Pos]): Box => Boolean = { // TODO: clean up // TODO: optimize (with polygon checks?) val xs = redTiles.map(_.x).distinct.sorted @@ -92,13 +99,7 @@ object Day9 { outsidePrefix(gridBox.min.y - 1)(gridBox.min.x - 1)) == 0 } - (for { - // faster than combinations(2) - (p1, i) <- redTiles.iterator.zipWithIndex - p2 <- redTiles.view.slice(i + 1, redTiles.size).iterator - box = Box.bounding(Seq(p1, p2)) - if isValid(box) - } yield box.size[Long]).max + isValid } } From 002a24f808362bbd1c04b45c28c68bd53281adf9 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 9 Dec 2025 20:17:09 +0200 Subject: [PATCH 62/99] Extract ArrayPartialSumGrid in 2025 day 9 part 2 --- .../eu/sim642/adventofcode2025/Day9.scala | 53 ++++++++++++------- 1 file changed, 33 insertions(+), 20 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala index acfa91c1..1c55e254 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala @@ -1,5 +1,6 @@ package eu.sim642.adventofcode2025 +import eu.sim642.adventofcode2018.Day11.SumGrid import eu.sim642.adventofcodelib.box.Box import eu.sim642.adventofcodelib.pos.Pos import eu.sim642.adventofcodelib.SeqImplicits.* @@ -31,6 +32,36 @@ object Day9 { _ => true } + // Copied & modified from 2018 day 11 + class ArrayPartialSumGrid(f: Pos => Int, box: Box) extends SumGrid { + val Box(min, max) = box + val Pos(width, height) = max - min + Pos(1, 1) + val partialSums: mutable.ArraySeq[mutable.ArraySeq[Int]] = mutable.ArraySeq.fill(height, width)(0) + // TODO: should be larger by 1 to allow min-coordinate queries? + + for (y <- 0 until height) { + for (x <- 0 until width) { + val pos = min + Pos(x, y) + val sum = + (if (y >= 1) partialSums(y - 1)(x) else 0) + + (if (x >= 1) partialSums(y)(x - 1) else 0) - + (if (x >= 1 && y >= 1) partialSums(y - 1)(x - 1) else 0) + + f(pos) + partialSums(y)(x) = sum + } + } + + override def sumBox(box: Box): Int = { + //val Box(topLeft, bottomRight) = box + val topLeft = box.min - min + val bottomRight = box.max - min + val bottomLeft1 = Pos(topLeft.x - 1, bottomRight.y) + val topRight1 = Pos(bottomRight.x, topLeft.y - 1) + val topLeft1 = Pos(topLeft.x - 1, topLeft.y - 1) + partialSums(bottomRight.y)(bottomRight.x) - partialSums(bottomLeft1.y)(bottomLeft1.x) - partialSums(topRight1.y)(topRight1.x) + partialSums(topLeft1.y)(topLeft1.x) + } + } + object Part2 extends Part { override def makeIsValid(redTiles: Seq[Pos]): Box => Boolean = { // TODO: clean up @@ -73,30 +104,12 @@ object Day9 { val outside = BFS.traverse(graphTraversal).nodes - val outsidePrefix = mutable.ArraySeq.fill(ys.size * 2 - 1 + 2, xs.size * 2 - 1 + 2)(0) - for (y <- outsidePrefix.indices) { - for (x <- outsidePrefix(y).indices) { - outsidePrefix(y)(x) = - (if (y >= 1) outsidePrefix(y - 1)(x) else 0) + - (if (x >= 1) outsidePrefix(y)(x - 1) else 0) - - (if (x >= 1 && y >= 1) outsidePrefix(y - 1)(x - 1) else 0) + - (if (outside(Pos(x, y))) 1 else 0) - } - } - - //for (row <- outsidePrefix) { - // for (cell <- row) - // print(s"$cell\t") - // println() - //} + val outsideSumGrid = new ArrayPartialSumGrid(pos => if (outside(pos)) 1 else 0, Box(Pos.zero, Pos(xs.size * 2, ys.size * 2))) def isValid(box: Box): Boolean = { val gridBox = Box(mapPos(box.min), mapPos(box.max)) //!gridBox.iterator.exists(outside) - (outsidePrefix(gridBox.max.y)(gridBox.max.x) - - outsidePrefix(gridBox.min.y - 1)(gridBox.max.x) - - outsidePrefix(gridBox.max.y)(gridBox.min.x - 1) + - outsidePrefix(gridBox.min.y - 1)(gridBox.min.x - 1)) == 0 + outsideSumGrid.sumBox(gridBox) == 0 } isValid From 744aa6c35eeec687afe0e46ac9308fc92054cb3a Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 9 Dec 2025 20:45:29 +0200 Subject: [PATCH 63/99] Clean up 2025 day 9 part 2 --- .../eu/sim642/adventofcode2025/Day9.scala | 91 +++++++------------ 1 file changed, 33 insertions(+), 58 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala index 1c55e254..4f5c82c0 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala @@ -1,12 +1,11 @@ package eu.sim642.adventofcode2025 import eu.sim642.adventofcode2018.Day11.SumGrid -import eu.sim642.adventofcodelib.box.Box -import eu.sim642.adventofcodelib.pos.Pos import eu.sim642.adventofcodelib.SeqImplicits.* +import eu.sim642.adventofcodelib.box.Box import eu.sim642.adventofcodelib.graph.{BFS, GraphTraversal, UnitNeighbors} +import eu.sim642.adventofcodelib.pos.Pos -import scala.collection.immutable.SortedSet import scala.collection.mutable object Day9 { @@ -36,25 +35,20 @@ object Day9 { class ArrayPartialSumGrid(f: Pos => Int, box: Box) extends SumGrid { val Box(min, max) = box val Pos(width, height) = max - min + Pos(1, 1) - val partialSums: mutable.ArraySeq[mutable.ArraySeq[Int]] = mutable.ArraySeq.fill(height, width)(0) - // TODO: should be larger by 1 to allow min-coordinate queries? - - for (y <- 0 until height) { - for (x <- 0 until width) { - val pos = min + Pos(x, y) - val sum = - (if (y >= 1) partialSums(y - 1)(x) else 0) + - (if (x >= 1) partialSums(y)(x - 1) else 0) - - (if (x >= 1 && y >= 1) partialSums(y - 1)(x - 1) else 0) + - f(pos) + val partialSums: mutable.ArraySeq[mutable.ArraySeq[Int]] = mutable.ArraySeq.fill(height + 1, width + 1)(0) // larger by 1 to allow min-coordinate queries + + for (y <- 1 until height + 1) { + for (x <- 1 until width + 1) { + val pos = min + Pos(x - 1, y - 1) + val sum = partialSums(y - 1)(x) + partialSums(y)(x - 1) - partialSums(y - 1)(x - 1) + f(pos) partialSums(y)(x) = sum } } override def sumBox(box: Box): Int = { //val Box(topLeft, bottomRight) = box - val topLeft = box.min - min - val bottomRight = box.max - min + val topLeft = box.min - min + Pos(1, 1) + val bottomRight = box.max - min + Pos(1, 1) val bottomLeft1 = Pos(topLeft.x - 1, bottomRight.y) val topRight1 = Pos(bottomRight.x, topLeft.y - 1) val topLeft1 = Pos(topLeft.x - 1, topLeft.y - 1) @@ -63,32 +57,29 @@ object Day9 { } object Part2 extends Part { - override def makeIsValid(redTiles: Seq[Pos]): Box => Boolean = { - // TODO: clean up - // TODO: optimize (with polygon checks?) + def makeCompressPos(redTiles: Seq[Pos]): Pos => Pos = { val xs = redTiles.map(_.x).distinct.sorted val ys = redTiles.map(_.y).distinct.sorted - //println(xs) - //println(ys) - def mapPos(p: Pos): Pos = + p => Pos(xs.indexOf(p.x) * 2 + 1, ys.indexOf(p.y) * 2 + 1) // leave edge around for fill + // it's much faster to do the +1-s here than add Pos(1, 1) below + } - val grid = mutable.ArraySeq.fill(ys.size * 2 - 1 + 2, xs.size * 2 - 1 + 2)('.') + override def makeIsValid(redTiles: Seq[Pos]): Box => Boolean = { + val compressPos = makeCompressPos(redTiles) + def compressBox(box: Box): Box = + Box(compressPos(box.min), compressPos(box.max)) - for ((redTile1, redTile2) <- redTiles lazyZip redTiles.rotateLeft(1)) { - val gridPos1 = mapPos(redTile1) - val gridPos2 = mapPos(redTile2) - for (gridPos <- Box.bounding(Seq(gridPos1, gridPos2)).iterator) - grid(gridPos.y)(gridPos.x) = 'X' - } + val originalBox = Box.bounding(redTiles) + val compressedBox@Box(_, compressedMax) = compressBox(originalBox) - for (redTile <- redTiles) { - val gridPos = mapPos(redTile) - //println((redTile, gridPos)) - grid(gridPos.y)(gridPos.x) = '#' + val grid = mutable.ArraySeq.fill(compressedMax.y + 2, compressedMax.x + 2)(false) // leave edge around for fill + // TODO: why need +2? + for ((redTile1, redTile2) <- redTiles lazyZip redTiles.rotateLeft(1)) { + for (pos <- compressBox(Box.bounding(Seq(redTile1, redTile2))).iterator) + grid(pos.y)(pos.x) = true } - //for (row <- grid) { // for (cell <- row) // print(cell) @@ -99,40 +90,24 @@ object Day9 { override val startNode: Pos = Pos.zero override def unitNeighbors(pos: Pos): IterableOnce[Pos] = - Pos.axisOffsets.map(pos + _).filter(p => p.x >= 0 && p.y >= 0 && p.y < grid.size && p.x < grid(p.y).size && grid(p.y)(p.x) == '.') + Pos.axisOffsets.map(pos + _).filter(p => p.x >= 0 && p.y >= 0 && p.y < grid.size && p.x < grid(p.y).size && !grid(p.y)(p.x)) } - val outside = BFS.traverse(graphTraversal).nodes - val outsideSumGrid = new ArrayPartialSumGrid(pos => if (outside(pos)) 1 else 0, Box(Pos.zero, Pos(xs.size * 2, ys.size * 2))) - + val outsideSumGrid = new ArrayPartialSumGrid(pos => if (outside(pos)) 1 else 0, compressedBox) def isValid(box: Box): Boolean = { - val gridBox = Box(mapPos(box.min), mapPos(box.max)) - //!gridBox.iterator.exists(outside) - outsideSumGrid.sumBox(gridBox) == 0 + val compressedBox = Box(compressPos(box.min), compressPos(box.max)) + //!compressedBox.iterator.exists(outside) + outsideSumGrid.sumBox(compressedBox) == 0 } isValid } } - /*object Part2 extends Part { - override def largestArea(redTiles: Seq[Pos]): Long = { - - def isValid(box: Box): Boolean = { - val boxCorners = Seq(box.min, Pos(box.max.x, box.min.y), box.max, Pos(box.min.x, box.max.y)) - ??? - } - - (for { - // faster than combinations(2) - (p1, i) <- redTiles.iterator.zipWithIndex - p2 <- redTiles.view.slice(i + 1, redTiles.size).iterator - box = Box.bounding(Seq(p1, p2)) - if isValid(box) - } yield box.size[Long]).max - } - }*/ + // TODO: line of sight in all directions solution (single iteration over corners, not all pairs!) + // TODO: glguy's solution + // TODO: polygon-based solution? def parseRedTile(s: String): Pos = s match { case s"$x,$y" => Pos(x.toInt, y.toInt) From 72ed0886f33dd21af4cfce21f2b83c211a249823 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 9 Dec 2025 23:30:27 +0200 Subject: [PATCH 64/99] Add intersection solution to 2025 day 9 part 2 --- .../eu/sim642/adventofcode2025/Day9.scala | 34 +++++++++++++-- .../eu/sim642/adventofcode2025/Day9Test.scala | 42 +++++++++++++------ 2 files changed, 61 insertions(+), 15 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala index 4f5c82c0..755fe292 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala @@ -31,6 +31,8 @@ object Day9 { _ => true } + trait Part2Solution extends Part + // Copied & modified from 2018 day 11 class ArrayPartialSumGrid(f: Pos => Int, box: Box) extends SumGrid { val Box(min, max) = box @@ -56,7 +58,11 @@ object Day9 { } } - object Part2 extends Part { + /** + * Solution, which compresses the grid to 2-unit distances between occurring coordinates + * and checks validity by counting outside cells (in the compressed grid) using a [[SumGrid]]. + */ + object CompressGridPart2Solution extends Part2Solution { def makeCompressPos(redTiles: Seq[Pos]): Pos => Pos = { val xs = redTiles.map(_.x).distinct.sorted val ys = redTiles.map(_.y).distinct.sorted @@ -105,9 +111,31 @@ object Day9 { } } + /** + * Solution, which checks validity geometrically using axis-aligned line-box intersection. + */ + object IntersectionPart2Solution extends Part2Solution { + override def makeIsValid(redTiles: Seq[Pos]): Box => Boolean = { + val lines = + (redTiles lazyZip redTiles.rotateLeft(1)) + .toSeq + .map((p1, p2) => Box.bounding(Seq(p1, p2))) // convert line to box of width/height 1 + + def isValid(box: Box): Boolean = { + // construct box interior, otherwise box intersects with its own edges + val innerMin = box.min + Pos(1, 1) + val innerMax = box.max - Pos(1, 1) + //innerMin <= innerMax && + !(innerMin <= innerMax) || // box has no/empty interior // TODO: this is wrong for line-line intersections + !lines.exists(_.intersect(Box(innerMin, innerMax)).nonEmpty) // interior doesn't intersect any line + } + + isValid + } + } + // TODO: line of sight in all directions solution (single iteration over corners, not all pairs!) // TODO: glguy's solution - // TODO: polygon-based solution? def parseRedTile(s: String): Pos = s match { case s"$x,$y" => Pos(x.toInt, y.toInt) @@ -119,6 +147,6 @@ object Day9 { def main(args: Array[String]): Unit = { println(Part1.largestArea(parseRedTiles(input))) - println(Part2.largestArea(parseRedTiles(input))) + println(CompressGridPart2Solution.largestArea(parseRedTiles(input))) } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala index 7d8c872a..6eb79ed6 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala @@ -1,9 +1,17 @@ package eu.sim642.adventofcode2025 -import Day9._ +import Day9.* +import Day9Test.* +import org.scalatest.Suites import org.scalatest.funsuite.AnyFunSuite -class Day9Test extends AnyFunSuite { +class Day9Test extends Suites( + new Part1Test, + new CompressGridPart2SolutionTest, + new IntersectionPart2SolutionTest, +) + +object Day9Test { val exampleInput = """7,1 @@ -15,19 +23,29 @@ class Day9Test extends AnyFunSuite { |2,3 |7,3""".stripMargin - test("Part 1 examples") { - assert(Part1.largestArea(parseRedTiles(exampleInput)) == 50) - } + class Part1Test extends AnyFunSuite { - test("Part 1 input answer") { - assert(Part1.largestArea(parseRedTiles(input)) == 4729332959L) - } + test("Part 1 examples") { + assert(Part1.largestArea(parseRedTiles(exampleInput)) == 50) + } - test("Part 2 examples") { - assert(Part2.largestArea(parseRedTiles(exampleInput)) == 24) + test("Part 1 input answer") { + assert(Part1.largestArea(parseRedTiles(input)) == 4729332959L) + } } - test("Part 2 input answer") { - assert(Part2.largestArea(parseRedTiles(input)) == 1474477524L) + abstract class Part2SolutionTest(part2Solution: Part2Solution) extends AnyFunSuite { + + test("Part 2 examples") { + assert(part2Solution.largestArea(parseRedTiles(exampleInput)) == 24) + } + + test("Part 2 input answer") { + assert(part2Solution.largestArea(parseRedTiles(input)) == 1474477524L) + } } + + class CompressGridPart2SolutionTest extends Part2SolutionTest(CompressGridPart2Solution) + + class IntersectionPart2SolutionTest extends Part2SolutionTest(IntersectionPart2Solution) } From ef43e54c4b2a75dce7e1f41268f6e0a65aa007f2 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Tue, 9 Dec 2025 23:39:05 +0200 Subject: [PATCH 65/99] Document 2025 day 9 part 2 solution assumptions --- .../eu/sim642/adventofcode2025/Day9.scala | 5 ++ .../eu/sim642/adventofcode2025/Day9Test.scala | 51 +++++++++++++++++-- 2 files changed, 53 insertions(+), 3 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala index 755fe292..71a3e198 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day9.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day9.scala @@ -61,6 +61,8 @@ object Day9 { /** * Solution, which compresses the grid to 2-unit distances between occurring coordinates * and checks validity by counting outside cells (in the compressed grid) using a [[SumGrid]]. + * + * Grid compression assumes no adjacent coordinates occur. */ object CompressGridPart2Solution extends Part2Solution { def makeCompressPos(redTiles: Seq[Pos]): Pos => Pos = { @@ -113,6 +115,9 @@ object Day9 { /** * Solution, which checks validity geometrically using axis-aligned line-box intersection. + * + * Assumes largest area won't be outside. + * Assumes no adjacent coordinates occur. */ object IntersectionPart2Solution extends Part2Solution { override def makeIsValid(redTiles: Seq[Pos]): Box => Boolean = { diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala index 6eb79ed6..b8f5e96f 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day9Test.scala @@ -23,29 +23,74 @@ object Day9Test { |2,3 |7,3""".stripMargin + val largeUInput = + """1,1 + |3,1 + |3,1000 + |1000,1000 + |1000,1 + |1002,1 + |1002,1002 + |1,1002""".stripMargin + + val adjacentCoordinateInput = // from Timvde on Libera IRC + """1,1 + |3,1 + |3,6 + |4,6 + |4,1 + |6,1 + |6,10 + |1,10""".stripMargin + class Part1Test extends AnyFunSuite { test("Part 1 examples") { assert(Part1.largestArea(parseRedTiles(exampleInput)) == 50) } + test("Part 1 large U") { + assert(Part1.largestArea(parseRedTiles(largeUInput)) == 1004004) + } + + test("Part 1 adjacent coordinate") { + assert(Part1.largestArea(parseRedTiles(adjacentCoordinateInput)) == 60) + } + test("Part 1 input answer") { assert(Part1.largestArea(parseRedTiles(input)) == 4729332959L) } } - abstract class Part2SolutionTest(part2Solution: Part2Solution) extends AnyFunSuite { + abstract class Part2SolutionTest(val part2Solution: Part2Solution) extends AnyFunSuite { test("Part 2 examples") { assert(part2Solution.largestArea(parseRedTiles(exampleInput)) == 24) } + ignore("Part 2 adjacent coordinate") { + // should not be 30 + assert(part2Solution.largestArea(parseRedTiles(adjacentCoordinateInput)) == 60) + } + test("Part 2 input answer") { assert(part2Solution.largestArea(parseRedTiles(input)) == 1474477524L) } } - class CompressGridPart2SolutionTest extends Part2SolutionTest(CompressGridPart2Solution) + class CompressGridPart2SolutionTest extends Part2SolutionTest(CompressGridPart2Solution) { + + test("Part 2 large U") { + // should not be 998000, which would be the completely outside box in the large U + assert(part2Solution.largestArea(parseRedTiles(largeUInput)) == 3006) + } + } - class IntersectionPart2SolutionTest extends Part2SolutionTest(IntersectionPart2Solution) + class IntersectionPart2SolutionTest extends Part2SolutionTest(IntersectionPart2Solution) { + + ignore("Part 2 large U") { // fails due to assumption + // should not be 998000, which would be the completely outside box in the large U + assert(part2Solution.largestArea(parseRedTiles(largeUInput)) == 3006) + } + } } From 46fe35da8394202a81471e9f8efc6ea368318354 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Wed, 10 Dec 2025 07:34:15 +0200 Subject: [PATCH 66/99] Solve 2025 day 10 part 1 --- .../eu/sim642/adventofcode2025/day10.txt | 162 ++++++++++++++++++ .../eu/sim642/adventofcode2025/Day10.scala | 43 +++++ .../sim642/adventofcode2025/Day10Test.scala | 20 +++ 3 files changed, 225 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2025/day10.txt create mode 100644 src/main/scala/eu/sim642/adventofcode2025/Day10.scala create mode 100644 src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala diff --git a/src/main/resources/eu/sim642/adventofcode2025/day10.txt b/src/main/resources/eu/sim642/adventofcode2025/day10.txt new file mode 100644 index 00000000..56a0bbe0 --- /dev/null +++ b/src/main/resources/eu/sim642/adventofcode2025/day10.txt @@ -0,0 +1,162 @@ +[.##.#..##.] (3,6) (0,1,2,3,4,5,7,9) (0,1,5,6,7,8,9) (1,9) (0,1,3,4,5,6,7) (0,1,2,3,4,5) (1,2,3,4,5,6,7,8) (2,3,5,7,8) (2,3,5,7,9) (0,1,2,3,4,6,9) (4,5,6,7,8) (3,6,7,8,9) {52,67,66,109,49,65,70,66,33,72} +[..##.] (2,4) (0,4) (1,3,4) (0,2,3,4) (2,3) {16,2,22,13,29} +[..#.##..] (1,2,3,4,5,6) (0,2,7) (1,2,3) (0,4) (0,1,4,5,6,7) (0,4,5,7) (0,1,2,3,5,7) {35,30,34,20,20,18,10,32} +[#.#.#..##] (0,2,4,5,6,7,8) (0,2,4,8) (0,1,4,5) (3,6,8) (2,6,8) (0,1,2,3,5,6) (0,5,7) (0,3,4,5) (2,4,5,6,8) (0,1,3,5) {78,40,73,52,50,88,79,25,63} +[###..#] (0,1,2,4,5) (0,4,5) (2,3) (1,3) (2,3,4,5) (0,1,4,5) (2,5) {33,38,44,37,46,51} +[.####...#.] (1,2,3,4,8) (0,1,2,3,4,5,6,9) (2,5) (0,4,6,7,9) (0,2,6,7,8) (0,2,6,8,9) (0,1,4,5,6,7,8,9) (1,5,6,9) (1,3) (0,1,2,3,4,7,8,9) (0,1,2,5,7) {57,69,71,46,34,52,43,31,38,52} 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+[...#...#..] (3,7) (0,1,4,8) (0,2,3,4,6,8) (0,1,2,3,4,6,7,9) (0,4,5,6) (0,1,2,3,6,7,8,9) (1,2,3,6,7,9) (1,5,6,8,9) {54,43,48,56,42,7,55,43,33,36} +[..#..###..] (0,1,2,3,6,9) (1,2,3,4,6,7,8) (0,2,4,8) (0,2,4,5,6,8,9) (0,3,4,6) (0,2,3,4,5,6,8,9) (0,1,5,7,8) (2,3,7,8,9) {71,32,75,68,71,42,74,32,73,53} +[#.###] (0,2,3,4) (0,2,4) (0,1,2,3) (1,3) {51,24,51,41,32} +[#.#..#.##] (2,3,6) (3,4,5,6,7,8) (0,1,2,3,4,6,8) (0,1,2,3,4,5,6,8) (1,3) (1,4,5,6,8) (6,8) (0,1,3,4,6,7) (1,2,3,4,8) (4,6) {44,211,64,232,70,14,80,19,53} +[.###.] (3) (1,4) (2,3) (0,2,3,4) (1,2,4) (0,2) (2,4) {19,122,57,47,151} +[##.#.] (0,2,3) (0,2,3,4) (1,2,4) (0,1,4) (0) (3,4) {36,19,26,33,36} +[#..#.#..] (0,1,5,6) (3,6) (0,1) (0,1,3,4,5,6) (6,7) (5,6,7) (2,5,6) (2,3,4) (0,3,5,6) {48,47,29,225,34,64,274,34} +[#.....] (0,2,3,5) (0) (0,1,2,3) (3,4) (0,1,4) (0,1,2,3,5) (1,2,3,4) (3,5) {29,20,24,41,20,23} +[####] (3) (2) (1,2,3) (0,2) (0) (1,2) {21,31,39,14} +[.#####..#] (1,4) (2,7,8) (2,4,5,6,8) (0,1,2,3,4,5,8) (0,5,6) (1,6) (2,4,5,7,8) (0,2,3,4,5) (3) {33,36,49,19,49,57,47,11,48} +[.#...#.] (2,4,6) (3,4,6) (0,1) (1,4) (0,2) (0,1,3,4,6) (0,5,6) {8,14,9,24,40,1,32} +[###.##.###] (2,8) (0,1,2,3,5,6,7,8,9) (0,2,4,5,7,8) (4,8,9) (0,1,4,5,6,7,8,9) (0,2,9) (0,1,2,3,4,5,8,9) (0,1,3,5,6,7,8,9) (0,1,3,5,8,9) (0,2,3,7) (0,1,2,3,5,6,7,8) {115,77,80,81,36,90,53,80,104,77} +[#.###] (1,3) (0,3,4) (0,1,2,3) (0,2,4) (0,2,3,4) (1) (0,3) {50,22,31,56,44} +[.#.#] (1,2) (0,2,3) (2,3) {13,8,194,186} +[.#.#......] (8) (0,4,8,9) (0,2,4,8,9) (1,2,4) (0,1,2,6,8) (5,8) (2,3,5,6,7,8,9) (0,2,3,4,5,6,7,8,9) (2,3,5,7,9) (2,4,6,8,9) (0,1) (4,6,7) {81,45,76,21,77,35,44,26,99,60} +[.#..##] (3,5) (1,2,3,4) (0,1,2) (0,1,3,4,5) (1,2) (1,2,3,4,5) (0,2,3) {35,59,60,62,44,24} +[###..#] (1,2,5) (3,5) (0,3,4) (0,1,2,5) {174,165,165,32,15,182} +[.#.#] (1,2) (1,3) (0,1) (0,1,3) (0,3) {38,69,19,39} +[..#..#] (1,2,3,4,5) (4) (0,2,4) (2,5) (0,2,3,4) (0,1,3,4) {27,2,29,17,38,4} +[###.#.##.#] (1,6,8,9) (1,4,5,9) (1,2,3,5,6,8,9) (0,1,2,4,5,6) (0,1,3,4,5,6,7,8) (0,4) (0,2,3,4,5,7,8,9) (0,2,3,5,6,9) (0,2,3) (2,3,4,9) {61,69,176,183,198,81,62,23,46,185} +[...##.#..#] (2,4,5,8,9) (0,2,3,4,5,6,7,8,9) (2,4,8) (7,8) (3,5,8) (0,4,6,8,9) (4,5,6,7,9) (1,2,3,4,5) (0,1,2,5,6,7,8,9) {32,10,38,29,53,38,35,19,71,35} +[...##..] (0,2,4,5,6) (2,3,4,5,6) (1,2,3,4,6) (1,3,4,5,6) (0,1,2,3,6) {111,26,127,35,142,135,144} +[...###.###] (0,1,2,3,6,7,8,9) (0,1,4,5,6,8) (1,2,3) (0,2,6,7) (1,4) (3,6) (1,2,3,6,7) (2,4) (4,5,6,8) (1,2,3,6,7,8,9) (0,2,3,4,6,7,9) {8,65,45,203,30,7,197,31,17,12} +[...#.##] (3,6) (0,1,3,4) (0,2,3,4,5,6) (0,1,4,5) (3,5,6) (0,1,2) (0,1,2,4) {68,56,34,48,49,36,30} +[.#.#..#] (1,4) (2,3,4) (5,6) (1,2,3,5) (0,1,2,3,4,6) (3,4,5) (3,5) (0,2,5,6) {13,25,49,39,23,41,23} +[.#..] (0,1,2) (2,3) (0,2) (0,2,3) {46,7,57,30} +[#####.#.] (0,3,4,5,7) (0,1,6) (0,1,3,5,6,7) (2,3,5) (2,3,4) (1,4,5,6,7) {36,28,24,40,33,30,28,21} +[...#.##.#] (0,2,7,8) (1,4,6) (0,1,2,3,4,5,6) (7,8) (1,2,4) (0,6,7,8) (0,1,2,3,5,6,7) (3,7,8) (1,2,3,4,5,6,7) {44,70,68,55,64,38,64,75,51} +[..#.#] (4) (0,3,4) (0,2,3,4) (0,1,2) (3) (1,2,3) (2,3,4) {24,17,48,51,53} +[####....#.] (6,7) (0,2,3,4,5,6) (0,1,4,5,6,7,8) (1,9) (1,4,7,8) (1,6,8) (1,6) (2,3,4,7) (3,5,8) (0,8,9) (1,2,3,4,6,7,8,9) (4,7,8) (2,5,9) {35,53,31,28,29,41,61,24,48,42} +[.##.#.###] (0,2,3,4) (3,4,6) (0,3,8) (0,1,5,6,7,8) (2,3) (0,1,2,4) (0,1,3,5,6,8) (0,2,4,5,6,8) (0,4,5,8) (1,3,4,5,8) {39,3,17,32,48,27,33,0,38} diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala new file mode 100644 index 00000000..a63967cd --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -0,0 +1,43 @@ +package eu.sim642.adventofcode2025 + +import eu.sim642.adventofcodelib.graph.{BFS, GraphSearch, TargetNode, UnitNeighbors} + +object Day10 { + + type Lights = Vector[Boolean] + type Buttons = Seq[Seq[Int]] + type Joltages = Seq[Int] + + case class Machine(lights: Lights, buttons: Buttons, joltages: Joltages) + + def fewestPresses(machine: Machine): Int = { + val graphSearch = new GraphSearch[Lights] with UnitNeighbors[Lights] with TargetNode[Lights] { + override val startNode: Lights = machine.lights.map(_ => false) + + override def unitNeighbors(lights: Lights): IterableOnce[Lights] = + machine.buttons.map(_.foldLeft(lights)((acc, i) => acc.updated(i, !acc(i)))) + + override val targetNode: Lights = machine.lights + } + + BFS.search(graphSearch).target.get._2 + } + + def sumFewestPresses(machines: Seq[Machine]): Int = machines.map(fewestPresses).sum + + def parseMachine(s: String): Machine = s match { + case s"[$lightsStr] $buttonsStr {$joltagesStr}" => + val lights = lightsStr.map(_ == '#').toVector + val buttons = buttonsStr.split(" ").map(_.tail.init.split(",").map(_.toInt).toSeq).toSeq + val joltages = joltagesStr.split(",").map(_.toInt).toSeq + Machine(lights, buttons, joltages) + } + + def parseMachines(input: String): Seq[Machine] = input.linesIterator.map(parseMachine).toSeq + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day10.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(sumFewestPresses(parseMachines(input))) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala new file mode 100644 index 00000000..d232cc4f --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala @@ -0,0 +1,20 @@ +package eu.sim642.adventofcode2025 + +import Day10._ +import org.scalatest.funsuite.AnyFunSuite + +class Day10Test extends AnyFunSuite { + + val exampleInput = + """[.##.] (3) (1,3) (2) (2,3) (0,2) (0,1) {3,5,4,7} + |[...#.] (0,2,3,4) (2,3) (0,4) (0,1,2) (1,2,3,4) {7,5,12,7,2} + |[.###.#] (0,1,2,3,4) (0,3,4) (0,1,2,4,5) (1,2) {10,11,11,5,10,5}""".stripMargin + + test("Part 1 examples") { + assert(sumFewestPresses(parseMachines(exampleInput)) == 7) + } + + test("Part 1 input answer") { + assert(sumFewestPresses(parseMachines(input)) == 449) + } +} From a2562d5793006f2ae13ef963baae389122ab761e Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Wed, 10 Dec 2025 07:41:17 +0200 Subject: [PATCH 67/99] Solve 2025 day 10 part 2 naively --- .../eu/sim642/adventofcode2025/Day10.scala | 23 ++++++++++++++++--- .../sim642/adventofcode2025/Day10Test.scala | 8 +++++++ 2 files changed, 28 insertions(+), 3 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala index a63967cd..d16976bb 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -1,12 +1,12 @@ package eu.sim642.adventofcode2025 -import eu.sim642.adventofcodelib.graph.{BFS, GraphSearch, TargetNode, UnitNeighbors} +import eu.sim642.adventofcodelib.graph.{BFS, Dijkstra, GraphSearch, TargetNode, UnitNeighbors} object Day10 { type Lights = Vector[Boolean] type Buttons = Seq[Seq[Int]] - type Joltages = Seq[Int] + type Joltages = Vector[Int] case class Machine(lights: Lights, buttons: Buttons, joltages: Joltages) @@ -25,11 +25,27 @@ object Day10 { def sumFewestPresses(machines: Seq[Machine]): Int = machines.map(fewestPresses).sum + // TODO: optimize + def fewestPresses2(machine: Machine): Int = { + val graphSearch = new GraphSearch[Joltages] with UnitNeighbors[Joltages] with TargetNode[Joltages] { + override val startNode: Joltages = machine.joltages.map(_ => 0) + + override def unitNeighbors(joltages: Joltages): IterableOnce[Joltages] = + machine.buttons.map(_.foldLeft(joltages)((acc, i) => acc.updated(i, acc(i) + 1))) + + override val targetNode: Joltages = machine.joltages + } + + BFS.search(graphSearch).target.get._2 + } + + def sumFewestPresses2(machines: Seq[Machine]): Int = machines.map(fewestPresses2).sum + def parseMachine(s: String): Machine = s match { case s"[$lightsStr] $buttonsStr {$joltagesStr}" => val lights = lightsStr.map(_ == '#').toVector val buttons = buttonsStr.split(" ").map(_.tail.init.split(",").map(_.toInt).toSeq).toSeq - val joltages = joltagesStr.split(",").map(_.toInt).toSeq + val joltages = joltagesStr.split(",").map(_.toInt).toVector Machine(lights, buttons, joltages) } @@ -39,5 +55,6 @@ object Day10 { def main(args: Array[String]): Unit = { println(sumFewestPresses(parseMachines(input))) + println(sumFewestPresses2(parseMachines(input))) } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala index d232cc4f..2b2153fc 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala @@ -17,4 +17,12 @@ class Day10Test extends AnyFunSuite { test("Part 1 input answer") { assert(sumFewestPresses(parseMachines(input)) == 449) } + + test("Part 2 examples") { + assert(sumFewestPresses2(parseMachines(exampleInput)) == 33) + } + + test("Part 2 input answer") { + //assert(sumFewestPresses2(parseMachines(input)) == 449) + } } From 352a5742da93813e83a2f9e49f3de065b4bef95a Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Wed, 10 Dec 2025 08:03:47 +0200 Subject: [PATCH 68/99] Solve 2025 day 10 part 2 using Z3 --- .../eu/sim642/adventofcode2025/Day10.scala | 43 +++++++++++++++++-- .../sim642/adventofcode2025/Day10Test.scala | 2 +- 2 files changed, 41 insertions(+), 4 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala index d16976bb..547a2df3 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -1,7 +1,10 @@ package eu.sim642.adventofcode2025 +import com.microsoft.z3.{ArithExpr, Context, IntExpr, IntSort, Status} import eu.sim642.adventofcodelib.graph.{BFS, Dijkstra, GraphSearch, TargetNode, UnitNeighbors} +import scala.jdk.CollectionConverters.* + object Day10 { type Lights = Vector[Boolean] @@ -25,9 +28,19 @@ object Day10 { def sumFewestPresses(machines: Seq[Machine]): Int = machines.map(fewestPresses).sum + /* + x0 x1 x2 x3 x4 x5 + (3) (1,3) (2) (2,3) (0,2) (0,1) + 0: x4 x5 = 3 + 1: x1 x5 = 5 + 2: x2 x3 x4 = 4 + 3: x0 x3 = 7 + + */ + // TODO: optimize def fewestPresses2(machine: Machine): Int = { - val graphSearch = new GraphSearch[Joltages] with UnitNeighbors[Joltages] with TargetNode[Joltages] { + /*val graphSearch = new GraphSearch[Joltages] with UnitNeighbors[Joltages] with TargetNode[Joltages] { override val startNode: Joltages = machine.joltages.map(_ => 0) override def unitNeighbors(joltages: Joltages): IterableOnce[Joltages] = @@ -36,10 +49,34 @@ object Day10 { override val targetNode: Joltages = machine.joltages } - BFS.search(graphSearch).target.get._2 + BFS.search(graphSearch).target.get._2*/ + + val ctx = new Context(Map("model" -> "true").asJava) + import ctx._ + val s = mkOptimize() + + val buttonVars = machine.buttons.zipWithIndex.map((_, i) => mkIntConst(s"x$i")) + val lhss = + machine.buttons + .lazyZip(buttonVars) + .foldLeft(machine.joltages.map[ArithExpr[IntSort]](i => mkInt(i)))({ case (accs, (button, buttonVar)) => + button.foldLeft(accs)((accs, i) => accs.updated(i, mkSub(accs(i), buttonVar))) + }) + + for (lhs <- lhss) + s.Add(mkEq(lhs, mkInt(0))) + + for (v <- buttonVars) + s.Add(mkGe(v, mkInt(0))) + + val presses = buttonVars.foldLeft[ArithExpr[IntSort]](mkInt(0))((acc, v) => mkAdd(acc, v)) + s.MkMinimize(presses) + assert(s.Check() == Status.SATISFIABLE) + //println(s.getModel) + s.getModel.evaluate(presses, false).toString.toInt } - def sumFewestPresses2(machines: Seq[Machine]): Int = machines.map(fewestPresses2).sum + def sumFewestPresses2(machines: Seq[Machine]): Int = machines.map(fewestPresses2).tapEach(println).sum def parseMachine(s: String): Machine = s match { case s"[$lightsStr] $buttonsStr {$joltagesStr}" => diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala index 2b2153fc..a01a7447 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala @@ -23,6 +23,6 @@ class Day10Test extends AnyFunSuite { } test("Part 2 input answer") { - //assert(sumFewestPresses2(parseMachines(input)) == 449) + assert(sumFewestPresses2(parseMachines(input)) == 17848) } } From bb65c34ebe93ee6e1ccaeab80240c2b2b368ceba Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Wed, 10 Dec 2025 08:17:43 +0200 Subject: [PATCH 69/99] Clean up 2025 day 10 --- .../eu/sim642/adventofcode2025/Day10.scala | 117 ++++++++++-------- .../sim642/adventofcode2025/Day10Test.scala | 46 +++++-- 2 files changed, 101 insertions(+), 62 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala index 547a2df3..2054fde5 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -13,71 +13,86 @@ object Day10 { case class Machine(lights: Lights, buttons: Buttons, joltages: Joltages) - def fewestPresses(machine: Machine): Int = { - val graphSearch = new GraphSearch[Lights] with UnitNeighbors[Lights] with TargetNode[Lights] { - override val startNode: Lights = machine.lights.map(_ => false) + trait Part { + def fewestPresses(machine: Machine): Int - override def unitNeighbors(lights: Lights): IterableOnce[Lights] = - machine.buttons.map(_.foldLeft(lights)((acc, i) => acc.updated(i, !acc(i)))) + def sumFewestPresses(machines: Seq[Machine]): Int = machines.map(fewestPresses).sum + } - override val targetNode: Lights = machine.lights - } + object Part1 extends Part { + override def fewestPresses(machine: Machine): Int = { + val graphSearch = new GraphSearch[Lights] with UnitNeighbors[Lights] with TargetNode[Lights] { + override val startNode: Lights = machine.lights.map(_ => false) - BFS.search(graphSearch).target.get._2 - } + override def unitNeighbors(lights: Lights): IterableOnce[Lights] = + machine.buttons.map(_.foldLeft(lights)((acc, i) => acc.updated(i, !acc(i)))) - def sumFewestPresses(machines: Seq[Machine]): Int = machines.map(fewestPresses).sum + override val targetNode: Lights = machine.lights + } - /* - x0 x1 x2 x3 x4 x5 - (3) (1,3) (2) (2,3) (0,2) (0,1) - 0: x4 x5 = 3 - 1: x1 x5 = 5 - 2: x2 x3 x4 = 4 - 3: x0 x3 = 7 + BFS.search(graphSearch).target.get._2 + } + } + + trait Part2Solution extends Part + /** + * Solution, which naively finds fewest presses by BFS. + * Does not scale to inputs. */ + object NaivePart2Solution extends Part2Solution { + override def fewestPresses(machine: Machine): Int = { + val graphSearch = new GraphSearch[Joltages] with UnitNeighbors[Joltages] with TargetNode[Joltages] { + override val startNode: Joltages = machine.joltages.map(_ => 0) - // TODO: optimize - def fewestPresses2(machine: Machine): Int = { - /*val graphSearch = new GraphSearch[Joltages] with UnitNeighbors[Joltages] with TargetNode[Joltages] { - override val startNode: Joltages = machine.joltages.map(_ => 0) + override def unitNeighbors(joltages: Joltages): IterableOnce[Joltages] = + machine.buttons.map(_.foldLeft(joltages)((acc, i) => acc.updated(i, acc(i) + 1))) - override def unitNeighbors(joltages: Joltages): IterableOnce[Joltages] = - machine.buttons.map(_.foldLeft(joltages)((acc, i) => acc.updated(i, acc(i) + 1))) + override val targetNode: Joltages = machine.joltages + } - override val targetNode: Joltages = machine.joltages + BFS.search(graphSearch).target.get._2 } + } - BFS.search(graphSearch).target.get._2*/ - - val ctx = new Context(Map("model" -> "true").asJava) - import ctx._ - val s = mkOptimize() - - val buttonVars = machine.buttons.zipWithIndex.map((_, i) => mkIntConst(s"x$i")) - val lhss = - machine.buttons - .lazyZip(buttonVars) - .foldLeft(machine.joltages.map[ArithExpr[IntSort]](i => mkInt(i)))({ case (accs, (button, buttonVar)) => - button.foldLeft(accs)((accs, i) => accs.updated(i, mkSub(accs(i), buttonVar))) + /** + * Solution, which finds fewest presses via an ILP problem, solved by Z3. + */ + object Z3Part2Solution extends Part2Solution { + /* + x0 x1 x2 x3 x4 x5 + (3) (1,3) (2) (2,3) (0,2) (0,1) + 0: x4 x5 = 3 + 1: x1 x5 = 5 + 2: x2 x3 x4 = 4 + 3: x0 x3 = 7 + */ + + override def fewestPresses(machine: Machine): Int = { + val ctx = new Context(Map("model" -> "true").asJava) + import ctx._ + val s = mkOptimize() + + val buttonPresses = machine.buttons.zipWithIndex.map((_, i) => mkIntConst(s"x$i")) + for (presses <- buttonPresses) + s.Add(mkGe(presses, mkInt(0))) + + val totalPresses = buttonPresses.foldLeft[ArithExpr[IntSort]](mkInt(0))(mkAdd(_, _)) + s.MkMinimize(totalPresses) + + (machine.buttons lazyZip buttonPresses) + .foldLeft(machine.joltages.map[ArithExpr[IntSort]](mkInt))({ case (acc, (button, presses)) => + button.foldLeft(acc)((acc, i) => acc.updated(i, mkSub(acc(i), presses))) }) + .foreach(joltageLeft => + s.Add(mkEq(joltageLeft, mkInt(0))) + ) - for (lhs <- lhss) - s.Add(mkEq(lhs, mkInt(0))) - - for (v <- buttonVars) - s.Add(mkGe(v, mkInt(0))) - - val presses = buttonVars.foldLeft[ArithExpr[IntSort]](mkInt(0))((acc, v) => mkAdd(acc, v)) - s.MkMinimize(presses) - assert(s.Check() == Status.SATISFIABLE) - //println(s.getModel) - s.getModel.evaluate(presses, false).toString.toInt + assert(s.Check() == Status.SATISFIABLE) + s.getModel.evaluate(totalPresses, false).toString.toInt + } } - def sumFewestPresses2(machines: Seq[Machine]): Int = machines.map(fewestPresses2).tapEach(println).sum - def parseMachine(s: String): Machine = s match { case s"[$lightsStr] $buttonsStr {$joltagesStr}" => val lights = lightsStr.map(_ == '#').toVector @@ -91,7 +106,7 @@ object Day10 { lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day10.txt")).mkString.trim def main(args: Array[String]): Unit = { - println(sumFewestPresses(parseMachines(input))) - println(sumFewestPresses2(parseMachines(input))) + println(Part1.sumFewestPresses(parseMachines(input))) + println(Z3Part2Solution.sumFewestPresses(parseMachines(input))) } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala index a01a7447..718bef9e 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala @@ -1,28 +1,52 @@ package eu.sim642.adventofcode2025 -import Day10._ +import Day10.* +import Day10Test.* +import org.scalatest.Suites import org.scalatest.funsuite.AnyFunSuite -class Day10Test extends AnyFunSuite { +class Day10Test extends Suites( + new Part1Test, + new NaivePart2SolutionTest, + new Z3Part2SolutionTest, +) + +object Day10Test { val exampleInput = """[.##.] (3) (1,3) (2) (2,3) (0,2) (0,1) {3,5,4,7} |[...#.] (0,2,3,4) (2,3) (0,4) (0,1,2) (1,2,3,4) {7,5,12,7,2} |[.###.#] (0,1,2,3,4) (0,3,4) (0,1,2,4,5) (1,2) {10,11,11,5,10,5}""".stripMargin - test("Part 1 examples") { - assert(sumFewestPresses(parseMachines(exampleInput)) == 7) - } + class Part1Test extends AnyFunSuite { - test("Part 1 input answer") { - assert(sumFewestPresses(parseMachines(input)) == 449) + test("Part 1 examples") { + assert(Part1.sumFewestPresses(parseMachines(exampleInput)) == 7) + } + + test("Part 1 input answer") { + assert(Part1.sumFewestPresses(parseMachines(input)) == 449) + } } - test("Part 2 examples") { - assert(sumFewestPresses2(parseMachines(exampleInput)) == 33) + abstract class Part2SolutionTest(part2Solution: Part2Solution) extends AnyFunSuite { + + test("Part 2 examples") { + assert(part2Solution.sumFewestPresses(parseMachines(exampleInput)) == 33) + } + + protected val testInput = true + + if (testInput) { + test("Part 2 input answer") { + assert(part2Solution.sumFewestPresses(parseMachines(input)) == 17848) + } + } } - test("Part 2 input answer") { - assert(sumFewestPresses2(parseMachines(input)) == 17848) + class NaivePart2SolutionTest extends Part2SolutionTest(NaivePart2Solution) { + override protected val testInput: Boolean = false } + + class Z3Part2SolutionTest extends Part2SolutionTest(Z3Part2Solution) } From ae461b3f7ae960e8fed254f1619784b225060173 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Thu, 11 Dec 2025 07:16:53 +0200 Subject: [PATCH 70/99] Solve 2025 day 11 part 1 --- .../eu/sim642/adventofcode2025/day11.txt | 631 ++++++++++++++++++ .../eu/sim642/adventofcode2025/Day11.scala | 36 + .../sim642/adventofcode2025/Day11Test.scala | 27 + 3 files changed, 694 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2025/day11.txt create mode 100644 src/main/scala/eu/sim642/adventofcode2025/Day11.scala create mode 100644 src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala diff --git a/src/main/resources/eu/sim642/adventofcode2025/day11.txt b/src/main/resources/eu/sim642/adventofcode2025/day11.txt new file mode 100644 index 00000000..29b9e1d2 --- /dev/null +++ b/src/main/resources/eu/sim642/adventofcode2025/day11.txt @@ -0,0 +1,631 @@ +yoy: dtu sgc qjc viq +vyp: tcu wrp +xof: jlp puv cth jwv +bvz: pis +mec: nem rak +bxi: ykt rie +ztr: xhp gms +mbs: isu bez pna +yzt: fqw ubj rhi +ctd: fri lpm run +bkj: hqz kag chj mop ysj +cml: wsd qdv wjf moy +jjv: pgt rua you +hwk: uvn +xvk: tre +jjf: kag hqz chj mop ysj +goe: kas +xuc: zdt +fqw: qrh lyw umm bjp +run: hjt heb jyg +yuu: vqz jih +jya: uuv kgc ero onh +bid: rcu aap zag +sll: evf uuv ero +fri: hjt +jzu: wyu wrp tcu +lsv: amz bzc els +nkk: upz nos +zvf: phf cpk sez edr +lcc: isj pgs +kmm: ave zou plb +cpk: eud pix wqm +vow: mcl vfd +ofc: typ +gtb: nmi yfy syh +ejd: azc qqp uxi zej +jxr: zwh oec nwz vch +tgx: wrp tcu +pmo: els bzc amz +hyd: wvv xeq +xcr: rvg dpn +wrp: weh yzt foo dcq uob +lbj: wyu ygr tcu +egw: cga +xnf: xeq bar kmm wvv dea +moy: pxf fvd +nsu: lcc kpp ftz +dcq: rcs vtd fal +uyh: out +opo: isi +cyu: cav zzc cao anq eze wlg jcn xpr gof syk dko cml cfq fmg xdi ytv egw vwg bsm cdi fki bmv fuf nlr clr +tom: yec uxi zej +vxo: ykk auv lry kmd +fjd: vxo obq +xhb: xro qzn +djq: ysj kag hqz chj +pve: out +zvx: byt fjg +heb: djq +ejy: pis urk cfx opo rdh +rib: mtt fjo tas pqh +tgh: mdu cbx hfh +cjv: iow vre +fmg: bey +mlf: kis +sgc: rib +awe: afr +edr: jzd wqm nrn +bqo: cpc ico twl +rld: jir +ave: cpc ico +tzw: hmh +sqt: cxy wrp wyu +wub: oec +qtm: ihy uwg oyu +hsp: cxy +obr: dst nre fft +inc: tve +amz: out +uwr: edu oun pjg +htk: ysj chj +zwe: tgx ccu jzx vyp +agc: npi hwk gnl +uvz: xdr mbs +yfy: ylw zyq lcx +zou: ico +nos: upw oim +syk: zvf att ckc +xow: uyh yel +uce: cxy ygr wrp +cbx: esf afr pgx +vam: vsa wnl +gmj: xex fdp ghk +lgs: tcu cxy wyu +gxv: ggt axc +hnh: esf afr +lgj: you +nma: oqs yel uyh +jcn: bey yht qtm +kwd: els bzc +fjo: kqy qdy mwi +cga: zpi eyb hnh +quf: bar dea +coh: wcq feg rak +fbh: rmn fvk xyx dxv +pgs: zag rcu +flr: wil +dpn: ysj +nri: lnk +vsl: pgt you +mqp: lnk gsk vvf +rie: yhv +yzn: ccu jzx tgx +jsm: nwz vch +and: cjv wil +ihz: vrb xuc ael nkk +zej: feg rak nem uso +hfh: afr +ckx: pdl +kjz: out +qdp: xdr zka mbs +ihy: ogt tgh +usc: jwf npx vee yhe +zpc: afr esf +gtm: qrh lyw wzo umm bjp +cwp: qii paz lkx +qsp: vyw dve nvi tud +itw: cxy tcu +dkm: out +vbr: evf uuv kgc +qzn: out +kna: tgx jzx +rgi: jlp vrw cth +nrn: zpc +xpr: ovd kar +plf: mop chj kag +kgc: uce hsp +olx: jjf gyn +van: rgi xof psj +tlv: lou kas gri kwn +wjg: rua pgt +azc: wcq +qme: you +yma: hzs vjr +zuw: out +wjh: afr +cjh: lou kwn kas +wxs: kmd ykk lry +syh: ylw +mlk: pgx +rhf: fal +thd: chj hqz mop +iow: kag chj mop ysj +sro: hxf inc lvz +ckc: edr +yel: out +dmx: run fri crk +zew: you rua pgt +jrv: feg wcq nem +vle: kag ysj mop +ptd: hbp +xex: qfi +ioj: pgt you +zfq: sof rld +lyw: uso rak nem feg +fpp: xof psj +eex: cxy tcu wrp ygr wyu +rip: rld hih pcq rmv +ren: out +fhk: yoy fvk rmn +wcq: sjo rwb hjo rvu miq mlf cqk hdl flr ykr xpc and fgm +pfs: plf rvg +vfd: afr pgx +byt: rho +pts: out +rto: wjg kjt vsl ioj gjs +tre: you rua +rho: qme feo +gre: jzx +wsw: wrp wyu cxy +qpg: usc +pjj: cvk +dve: ynq qwc +anq: rqt crs +pxf: pgx +ldp: ogt +hzs: kag chj mop +mnj: irl tfm +ygr: hln rfw rhf guu nfp weh iwg vfy dkg uob ooh yzt aas bxi dcq sro rsa dio zhl fjd +miq: vyw tud +kas: xev +elv: nem feg wcq +asn: oid rho igi +ykt: yhv ejd rjm +qcv: plf +viy: nem rak wcq feg +zny: hwd wsw +xev: pgt you +ovd: zpi klm eyb hnh +ygy: feg +bix: zvi sfd jrg +xod: rip eda nob +ikg: hmh +uzc: pgx +fpf: feg +ytv: hem axc ckx +fft: sqt akb +ksj: vle +gms: yfy nmi +nob: pcq hih +vch: awe orp uzc +zag: gcc gob yfg +sbe: oim xhb upw +lqu: kwn ile kas +svr: vpo cyu hfy csx +mja: ucz ren +vvf: rcq alw zny cit +chi: rak nem uso feg +sle: dbw +pqh: xrz kqy +fna: tjd +eze: kar ovd cga +bbh: evf onh uuv +bjp: feg wcq uso rak +lcp: edf foa +wjf: pxf +ooh: hxf xey lvz +eda: sof rld rmv +pnn: pgt +isi: ghq rmb bes bco +hjt: vle +ucz: out +urk: isi jju +pjd: hcq bfj wmj +gxj: crk +igi: rsh feo lgj +puv: zwe 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+tfm: urg ucz ren cop +jlp: kna zwe +xxa: esf +jju: ghq bes oev +ikc: xyx rmn +ogt: xmm hfh +gwl: gmj wwm skj +kia: byt fjg +hjo: yef ctd dmx +vtd: jrv mec qxg chi ygy +wyu: hln ooh rhf pjd rsa iwg sro zhl fjd +viq: zdz srl +xdi: lcp crs +vre: chj +npx: gjs vsl +hbq: jxr wub uws pdl +vyw: ynq qwc nff ujo +psm: vvf gsk +csx: egw zzc vwg cml nlr clr cfq gxv fmg xpr jcn fuf syk bmv +pis: isi jju +upr: gbi +qrh: wcq feg nem uso +ico: itw eex jzu vsh +mcl: afr pgx +inm: eps tre zew +cxy: dio rsa sro yzt ooh dcq bxi aas iwg weh uob dkg vfy hln rfw rhf foo +xro: out +evf: zpz qmi hsp +aaa: dbw nxp +pna: lkx paz +pbb: mcl wjh fwp vfd +eij: wrp ygr tcu cxy +wdl: wil cjv +clr: ggt +cdi: ckc zvf +yjj: jih +vrw: fck yzn zwe kna +hqt: pgt you +eps: you rua pgt +oec: orp +vqz: wcq feg rak nem uso +you: uyu fbh cll ztr ikc fna fhk tee squ sqf hnr +zyq: loy nma xow +rak: cbr hdl miq mlf hjo xpc ykr yur rvu flr qsp +rcu: bjw gcc +zka: cwp bez rrm isu +ibw: ysj +rvu: mbs xdr +dea: bqp bqo zou plb +hfy: cfq fmg clr cml bmv cdi gof xpr eze cao vwg zzc egw ytv +zoj: xsy +nfp: irw ykt +ykk: elv iiz cim +qex: vsa nkn obr +eru: mop kag hqz +rua: hnr sle sqf squ atn fhk aaa zpd ikc kiy sgl eca fbh cne ivi cll uyu agc +uso: hjo rwb qdp qsp pih lzq and fgm mlf +wnl: dst nre fft +cqk: yef gxj dmx +yzh: urk opo +pgx: dpa van zcc quf vam goo vxk pjj fpp +vfy: ubj fqw +jzd: chk zpc +wlg: moy wjf ubd wsd +sgl: xhp +rfw: bfj wmj +fck: vyp tgx +nlr: lcp crs +mdu: pgx +plb: twl ico cpc +goo: psj rgi +wfi: okn +upq: skj +upz: upw +gcc: pgt +kar: zpi eyb klm +cao: qtm +crs: foa edf pbb vow +nvi: kib nff qwc ujo +ubj: bjp wzo lyw +isu: lkx +lnk: rcq zny cit +hnr: xhp gtb +atw: cwp bez rrm pna +uws: zwh ewg oec nwz +mga: coh rth +tcu: guu nfp rhf uob zhl bxi fjd +ynq: sap pfs qcv +kpr: rto npx jwf yhe vee +hcq: vqz fmn +kpi: rip +yhv: uxi zej +gjg: byt +fal: jrv qxg chi mec +chk: esf afr pgx +tjd: zoj uhp +sul: pnn rsh +ylw: fhg ptd nma +bqp: twl +rmn: viq +gkv: ygr +hqz: kia gjg oco dzm ccr rxm sfl yah +vwg: bey yht qtm +bfj: fmn vqz +cne: xyx yoy +axc: pdl uws jsm +eyb: esf afr +fhg: yel +jbw: qqp yec +uxi: feg uso nem rak +tee: yzh ejy +nff: xcr +edu: ltz kwd +sfd: vbr +hwd: cxy tcu wrp ygr +yhe: kjt +kwn: xev hqt +qfi: lsv +fjg: oid +mop: tlv qpg cck cjh kia zvx tig rxm +ftz: bid pgs isj +klm: afr +irw: tom jbw +vsh: wrp cxy tcu +sqf: skj wwm gmj +cth: yzn fck gre +esf: dpa hyd zcc ozc amq goo nri pjj xnf vxk +bzv: pgx esf +nem: wdl mlf cbr uvz pih bsg rwb xpc ykr +qwc: xcr nit qcv pfs +zdt: upw oim +hbp: out +jyg: htk djq vle +bes: pve +pgt: tee atn gwl zpd ark fna uyu kiy ikc upq ztr +clb: pgx esf +bzc: out +uvn: ycj qin +ycj: mja tfm +bez: paz yma +xdr: isu pna rrm +uuv: hsp qmi +xmm: afr +cpc: gkv jzu vsh eex itw +dxv: dtu sgc +squ: gms xhp +zzc: att ckc +dio: vtd rcs +fki: moy qdv wjf ubd wsd +zpd: bvz +nre: eij +flp: fjg asn +aap: yfg +cbr: olx +rwb: dmx yef +yah: elo +fmn: wcq feg +elo: isj dac ofc bid pgs +guu: rcs fal vtd +edf: mlk +oco: xvk lib +cit: lbj lgs +crk: jyg eec +kjt: you pgt +qys: mnj +obq: auv +pix: bzv +sap: plf dpn rvg thd +cav: kar ovd +ryc: clb mdu xmm hfh +cgn: kwo inm lib +vjr: chj hqz kag mop +npi: qys uvn +isj: rcu aap zag +sez: eud jzd wqm +dst: sqt +hih: ibw +iwg: gtm fqw rhi +kqy: out +lry: elv viy iiz cim +eec: htk +gob: pgt rua +lib: zew eps tre +lkx: vjr lqn +ile: jjv +rmb: kjz pts +fgm: zka mbs +eud: bzv zpc +zwh: uzc +kmd: cim elv iiz viy +kiy: yzh bvz +fuf: att frp +uwg: ogt ryc +dee: esf afr +mtt: xrz kqy +onh: hsp qmi zpz +gbi: igi sul oid +dtu: srl +oun: lsv pmo +ghk: edu oun +gyn: mop hqz kag chj +ark: hwk gnl +kwo: tre +cim: uso rak feg wcq +tig: usc kpr okn +uyu: npi hwk tjd gnl +nnp: psj rgi xof +oim: pro gbk lav +rhi: lyw qrh umm +srl: tas fjo mtt pqh +zpi: pgx +twl: gkv vsh eex itw +xpc: tud +bjw: you pgt +nmi: lcx +att: vpg cpk phf +yec: feg wcq uso rak +psj: cth +rqt: edf +xrz: out +cvk: jya +pwl: mwi +pih: nvi dve vyw +cll: ejy yzh +tve: hmh coh rth +rsh: pgt you +xeq: ave bqo +qjc: srl rib +tud: ujo kib nff +eca: ihz +jrg: bbh +pdl: zwh ewg +sjo: zka atw +vee: kjt wjg ioj vsl gjs +lpm: ksj hjt eec heb +dpa: jrg +okn: vee yhe jwf +aas: fal rcs +sof: eru +lzq: xod +rdh: aiv +bsm: yht +nyq: hwd wsw lgs +wqm: chk zpc bzv +frp: sez cpk edr phf +prr: ebn bbh sll vbr +nwz: wlw +amq: nkn obr +ujo: sap qcv nit xcr +dac: aap typ zag +lav: out +ebn: onh ero kgc evf +atn: gms xhp +hdl: tud nvi dve vyw +jwv: gre +edl: kis xod zhz kpi +jzx: cxy tcu wrp ygr wyu +oev: zuw +ael: sbe upz nos miw +loy: hbp yel oqs uyh +qxg: wcq +nit: thd +ltz: amz els +gbk: out +cfq: ovd cga +fdp: pjg +ozc: jrg sfd cvk +gjs: pgt you +bey: uwg ldp oyu ihy +els: out +gof: hbq ckx axc ggt +qii: lqn hzs vjr tgv +weh: hcq yuu yjj bfj +qdv: fvd pxf xxa +aiv: rmb oev bes +chj: tlv cgn cck gdj gjg kia yah wfi tig nsu sfl goe flp ccr qpg dzm oco cjh lqu zvx upr rxm +gsk: zny nyq +rsa: lvz +ggt: jxr jsm +ubd: pxf fvd +vsa: fft +fvk: qjc +mwi: out +oid: rsh lgj feo +vxk: xof +wwm: fdp uwr +miw: oim xhb +foa: fwp wjh mcl +orp: esf afr pgx +zpz: ygr wrp cxy +dkg: rie +pll: zew +uhp: qin ycj mnj +kgp: ykk auv lry +fwp: esf pgx afr +jwf: vsl +tas: qdy kqy +sfl: kwo pll +zdz: pwl tas mtt +wsd: xxa pxf fvd +urg: out +wlw: pgx afr +lkf: coh hmh +kib: nit pfs sap +rth: uso feg wcq +rcs: jrv qxg chi mec +paz: tgv lqn hzs +feg: hdl mlf cqk wdl rvu hjo qdp rwb sjo and fgm cbr lzq ykr xpc edl flr uvz +hln: kgp vxo wxs +bar: plb +afr: dpa nnp mqp quf vxk pjj psm vam hyd bix zcc qex xnf nri +ivi: wwm +pro: out +alw: lgs hwd lbj wsw +dbw: nkk ael xuc +pcq: ibw eru jir +yur: cjv wil +gnl: zoj uvn uhp +qqp: feg wcq rak nem +akb: ygr wyu cxy +umm: feg +lvz: ikg tzw lkf +zhz: rip zfq +rvg: hqz kag ysj mop +yfg: pgt rua you +ghq: pts zuw dkm pve +ccr: lou kwn gri kas +xey: mga lkf tve +xyx: qjc dtu +kis: eda +bsg: zhz +wmj: jih +ccu: tcu wyu +oyu: tgh ryc +foo: wxs +ewg: dee uzc wlw +gri: jjv hqt +phf: eud nrn wqm pix +jih: uso nem +typ: gob yfg +ykr: dmx ctd gxj +auv: cim fpf elv viy diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala new file mode 100644 index 00000000..fc4b13f8 --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala @@ -0,0 +1,36 @@ +package eu.sim642.adventofcode2025 + +import scala.collection.mutable + +object Day11 { + + type Device = String + + def countPaths(devices: Map[Device, Seq[Device]], from: Device = "you", to: Device = "out"): Int = { // TODO: Long? + + val memo = mutable.Map.empty[Device, Int] + + def helper(device: Device): Int = { + memo.getOrElseUpdate(device, { + if (device == to) + 1 + else + devices(device).map(helper).sum + }) + } + + helper(from) + } + + def parseDevice(s: String): (Device, Seq[Device]) = s match { + case s"$key: $values" => key -> values.split(" ").toSeq + } + + def parseDevices(input: String): Map[Device, Seq[Device]] = input.linesIterator.map(parseDevice).toMap + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day11.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(countPaths(parseDevices(input))) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala new file mode 100644 index 00000000..8a276203 --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala @@ -0,0 +1,27 @@ +package eu.sim642.adventofcode2025 + +import Day11._ +import org.scalatest.funsuite.AnyFunSuite + +class Day11Test extends AnyFunSuite { + + val exampleInput = + """aaa: you hhh + |you: bbb ccc + |bbb: ddd eee + |ccc: ddd eee fff + |ddd: ggg + |eee: out + |fff: out + |ggg: out + |hhh: ccc fff iii + |iii: out""".stripMargin + + test("Part 1 examples") { + assert(countPaths(parseDevices(exampleInput)) == 5) + } + + test("Part 1 input answer") { + assert(countPaths(parseDevices(input)) == 643) + } +} From 0cde15ec42bf93617bb61d92742938fc2cf53310 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Thu, 11 Dec 2025 07:28:31 +0200 Subject: [PATCH 71/99] Solve 2025 day 11 part 2 --- .../eu/sim642/adventofcode2025/Day11.scala | 21 +++++++++++++++-- .../sim642/adventofcode2025/Day11Test.scala | 23 +++++++++++++++++++ 2 files changed, 42 insertions(+), 2 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala index fc4b13f8..b1b09ff5 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala @@ -6,8 +6,7 @@ object Day11 { type Device = String - def countPaths(devices: Map[Device, Seq[Device]], from: Device = "you", to: Device = "out"): Int = { // TODO: Long? - + def countPaths(devices: Map[Device, Seq[Device]], from: Device = "you", to: Device = "out"): Int = { val memo = mutable.Map.empty[Device, Int] def helper(device: Device): Int = { @@ -22,6 +21,23 @@ object Day11 { helper(from) } + def countPaths2(devices: Map[Device, Seq[Device]], from: Device = "svr", to: Device = "out"): Long = { + val vias = Set("dac", "fft") + + val memo = mutable.Map.empty[Device, Map[Set[Device], Long]] + + def helper(device: Device): Map[Set[Device], Long] = { + memo.getOrElseUpdate(device, { + if (device == to) + Map(Set.empty -> 1) + else + devices(device).flatMap(helper).groupMapReduce(_._1)(_._2)(_ + _).map((k, v) => (k.union(vias.intersect(Set(device)))) -> v) + }) + } + + helper(from)(vias) + } + def parseDevice(s: String): (Device, Seq[Device]) = s match { case s"$key: $values" => key -> values.split(" ").toSeq } @@ -32,5 +48,6 @@ object Day11 { def main(args: Array[String]): Unit = { println(countPaths(parseDevices(input))) + println(countPaths2(parseDevices(input))) } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala index 8a276203..a3437a7c 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala @@ -17,6 +17,21 @@ class Day11Test extends AnyFunSuite { |hhh: ccc fff iii |iii: out""".stripMargin + val exampleInput2 = + """svr: aaa bbb + |aaa: fft + |fft: ccc + |bbb: tty + |tty: ccc + |ccc: ddd eee + |ddd: hub + |hub: fff + |eee: dac + |dac: fff + |fff: ggg hhh + |ggg: out + |hhh: out""".stripMargin + test("Part 1 examples") { assert(countPaths(parseDevices(exampleInput)) == 5) } @@ -24,4 +39,12 @@ class Day11Test extends AnyFunSuite { test("Part 1 input answer") { assert(countPaths(parseDevices(input)) == 643) } + + test("Part 2 examples") { + assert(countPaths2(parseDevices(exampleInput2)) == 2) + } + + test("Part 2 input answer") { + assert(countPaths2(parseDevices(input)) == 417190406827152L) + } } From 13555e1c21d0a550cb4d83875cc1e8fbd9ba631e Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Thu, 11 Dec 2025 07:43:55 +0200 Subject: [PATCH 72/99] Refactor 2025 day 11 --- .../eu/sim642/adventofcode2025/Day11.scala | 56 +++++++++---------- .../sim642/adventofcode2025/Day11Test.scala | 8 +-- 2 files changed, 32 insertions(+), 32 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala index b1b09ff5..d68a7b23 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala @@ -6,36 +6,36 @@ object Day11 { type Device = String - def countPaths(devices: Map[Device, Seq[Device]], from: Device = "you", to: Device = "out"): Int = { - val memo = mutable.Map.empty[Device, Int] - - def helper(device: Device): Int = { - memo.getOrElseUpdate(device, { - if (device == to) - 1 - else - devices(device).map(helper).sum - }) + trait Part { + val from: Device + val via: Set[Device] + val to: Device = "out" + + def countPaths(devices: Map[Device, Seq[Device]]): Long = { + val memo = mutable.Map.empty[Device, Map[Set[Device], Long]] + + def helper(device: Device): Map[Set[Device], Long] = { + memo.getOrElseUpdate(device, { + val deviceVia = via.intersect(Set(device)) + if (device == to) + Map(deviceVia -> 1) + else + devices(device).flatMap(helper).groupMapReduce(_._1 ++ deviceVia)(_._2)(_ + _) + }) + } + + helper(from)(via) } - - helper(from) } - def countPaths2(devices: Map[Device, Seq[Device]], from: Device = "svr", to: Device = "out"): Long = { - val vias = Set("dac", "fft") - - val memo = mutable.Map.empty[Device, Map[Set[Device], Long]] - - def helper(device: Device): Map[Set[Device], Long] = { - memo.getOrElseUpdate(device, { - if (device == to) - Map(Set.empty -> 1) - else - devices(device).flatMap(helper).groupMapReduce(_._1)(_._2)(_ + _).map((k, v) => (k.union(vias.intersect(Set(device)))) -> v) - }) - } + object Part1 extends Part { + override val from: Device = "you" + override val via: Set[Device] = Set.empty + } - helper(from)(vias) + object Part2 extends Part { + override val from: Device = "svr" + override val via: Set[Device] = Set("dac", "fft") } def parseDevice(s: String): (Device, Seq[Device]) = s match { @@ -47,7 +47,7 @@ object Day11 { lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day11.txt")).mkString.trim def main(args: Array[String]): Unit = { - println(countPaths(parseDevices(input))) - println(countPaths2(parseDevices(input))) + println(Part1.countPaths(parseDevices(input))) + println(Part2.countPaths(parseDevices(input))) } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala index a3437a7c..73cb092c 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala @@ -33,18 +33,18 @@ class Day11Test extends AnyFunSuite { |hhh: out""".stripMargin test("Part 1 examples") { - assert(countPaths(parseDevices(exampleInput)) == 5) + assert(Part1.countPaths(parseDevices(exampleInput)) == 5) } test("Part 1 input answer") { - assert(countPaths(parseDevices(input)) == 643) + assert(Part1.countPaths(parseDevices(input)) == 643) } test("Part 2 examples") { - assert(countPaths2(parseDevices(exampleInput2)) == 2) + assert(Part2.countPaths(parseDevices(exampleInput2)) == 2) } test("Part 2 input answer") { - assert(countPaths2(parseDevices(input)) == 417190406827152L) + assert(Part2.countPaths(parseDevices(input)) == 417190406827152L) } } From 81d234b4637c1528332931d4e8cd0d2d18c5a398 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Thu, 11 Dec 2025 19:51:14 +0200 Subject: [PATCH 73/99] Refactor 2025 day 11 for alternative solutions --- .../eu/sim642/adventofcode2025/Day11.scala | 64 +++++++++++++------ .../sim642/adventofcode2025/Day11Test.scala | 36 +++++++---- 2 files changed, 67 insertions(+), 33 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala index d68a7b23..0cb37257 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala @@ -5,48 +5,72 @@ import scala.collection.mutable object Day11 { type Device = String + type Devices = Map[Device, Seq[Device]] - trait Part { + trait PartDevices { val from: Device val via: Set[Device] val to: Device = "out" - - def countPaths(devices: Map[Device, Seq[Device]]): Long = { - val memo = mutable.Map.empty[Device, Map[Set[Device], Long]] - - def helper(device: Device): Map[Set[Device], Long] = { - memo.getOrElseUpdate(device, { - val deviceVia = via.intersect(Set(device)) - if (device == to) - Map(deviceVia -> 1) - else - devices(device).flatMap(helper).groupMapReduce(_._1 ++ deviceVia)(_._2)(_ + _) - }) - } - - helper(from)(via) - } } - object Part1 extends Part { + trait Part1Devices extends PartDevices { override val from: Device = "you" override val via: Set[Device] = Set.empty } - object Part2 extends Part { + trait Part2Devices extends PartDevices { override val from: Device = "svr" override val via: Set[Device] = Set("dac", "fft") } + trait PartSolution extends PartDevices { + def countPaths(devices: Devices): Long + } + + trait Solution { + val Part1: PartSolution + val Part2: PartSolution + } + + /** + * Solution, which counts paths separately for subsets of visited vias. + */ + object ViaMapSolution extends Solution { + trait ViaMapPartSolution extends PartSolution { + override def countPaths(devices: Devices): Long = { + val memo = mutable.Map.empty[Device, Map[Set[Device], Long]] + + def helper(device: Device): Map[Set[Device], Long] = { + memo.getOrElseUpdate(device, { + val deviceVia = via.intersect(Set(device)) + if (device == to) + Map(deviceVia -> 1) + else + devices(device).flatMap(helper).groupMapReduce(_._1 ++ deviceVia)(_._2)(_ + _) + }) + } + + helper(from)(via) + } + } + + override object Part1 extends ViaMapPartSolution with Part1Devices + override object Part2 extends ViaMapPartSolution with Part2Devices + } + + // TODO: path count product solution + def parseDevice(s: String): (Device, Seq[Device]) = s match { case s"$key: $values" => key -> values.split(" ").toSeq } - def parseDevices(input: String): Map[Device, Seq[Device]] = input.linesIterator.map(parseDevice).toMap + def parseDevices(input: String): Devices = input.linesIterator.map(parseDevice).toMap lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day11.txt")).mkString.trim def main(args: Array[String]): Unit = { + import ViaMapSolution._ + println(Part1.countPaths(parseDevices(input))) println(Part2.countPaths(parseDevices(input))) } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala index 73cb092c..6b7fbf63 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala @@ -1,9 +1,15 @@ package eu.sim642.adventofcode2025 -import Day11._ +import Day11.* +import Day11Test.* +import org.scalatest.Suites import org.scalatest.funsuite.AnyFunSuite -class Day11Test extends AnyFunSuite { +class Day11Test extends Suites( + new ViaMapSolutionTest, +) + +object Day11Test { val exampleInput = """aaa: you hhh @@ -32,19 +38,23 @@ class Day11Test extends AnyFunSuite { |ggg: out |hhh: out""".stripMargin - test("Part 1 examples") { - assert(Part1.countPaths(parseDevices(exampleInput)) == 5) - } + abstract class SolutionTest(solution: Solution) extends AnyFunSuite { + test("Part 1 examples") { + assert(solution.Part1.countPaths(parseDevices(exampleInput)) == 5) + } - test("Part 1 input answer") { - assert(Part1.countPaths(parseDevices(input)) == 643) - } + test("Part 1 input answer") { + assert(solution.Part1.countPaths(parseDevices(input)) == 643) + } - test("Part 2 examples") { - assert(Part2.countPaths(parseDevices(exampleInput2)) == 2) - } + test("Part 2 examples") { + assert(solution.Part2.countPaths(parseDevices(exampleInput2)) == 2) + } - test("Part 2 input answer") { - assert(Part2.countPaths(parseDevices(input)) == 417190406827152L) + test("Part 2 input answer") { + assert(solution.Part2.countPaths(parseDevices(input)) == 417190406827152L) + } } + + class ViaMapSolutionTest extends SolutionTest(ViaMapSolution) } From 1f8232d9d1f250dab58a94d9542b5b5088201df0 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Thu, 11 Dec 2025 20:20:53 +0200 Subject: [PATCH 74/99] Add permutation solution to 2025 day 11 --- .../eu/sim642/adventofcode2025/Day11.scala | 41 ++++++++++++++++++- .../sim642/adventofcode2025/Day11Test.scala | 3 ++ 2 files changed, 43 insertions(+), 1 deletion(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala index 0cb37257..0a37ab67 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala @@ -1,5 +1,6 @@ package eu.sim642.adventofcode2025 +import scala.annotation.tailrec import scala.collection.mutable object Day11 { @@ -58,7 +59,45 @@ object Day11 { override object Part2 extends ViaMapPartSolution with Part2Devices } - // TODO: path count product solution + /** + * Solution, which tries all permutations of vias and counts each one by multiplying adjacent steps. + */ + object PermutationSolution extends Solution { + trait PermutationPartSolution extends PartSolution { + def countPathsTo(devices: Devices)(to: Device): Device => Long = { + val memo = mutable.Map.empty[Device, Long] + + def helper(device: Device): Long = { + memo.getOrElseUpdate(device, { + if (device == to) + 1 + else + devices.getOrElse(device, Set.empty).map(helper).sum // need getOrElse for "out" when from is different, but reaches "out" + }) + } + + helper + } + + override def countPaths(devices: Devices): Long = { + val memo = mutable.Map.empty[Device, Device => Long] + + def countPathsFromTo(from: Device, to: Device): Long = // memoize by to, because same to will be reused + memo.getOrElseUpdate(to, countPathsTo(devices)(to))(from) + + @tailrec + def helper(prevDevice: Device, acc: Long, via: List[Device]): Long = via match { + case Nil => acc * countPathsFromTo(prevDevice, to) + case device :: newVia => helper(device, acc * countPathsFromTo(prevDevice, device), newVia) // TODO: optimize: stop when countPathsFromTo is zero + } + + via.toList.permutations.map(helper(from, 1L, _)).sum // TODO: optimize: only one can be non-zero, stop on first + } + } + + override object Part1 extends PermutationPartSolution with Part1Devices + override object Part2 extends PermutationPartSolution with Part2Devices + } def parseDevice(s: String): (Device, Seq[Device]) = s match { case s"$key: $values" => key -> values.split(" ").toSeq diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala index 6b7fbf63..30fada67 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala @@ -7,6 +7,7 @@ import org.scalatest.funsuite.AnyFunSuite class Day11Test extends Suites( new ViaMapSolutionTest, + new PermutationSolutionTest, ) object Day11Test { @@ -57,4 +58,6 @@ object Day11Test { } class ViaMapSolutionTest extends SolutionTest(ViaMapSolution) + + class PermutationSolutionTest extends SolutionTest(PermutationSolution) } From afeb374173754b92f4e70ebfa0ded6965441e887 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Thu, 11 Dec 2025 20:25:51 +0200 Subject: [PATCH 75/99] Optimize permutation solution in 2025 day 11 --- src/main/scala/eu/sim642/adventofcode2025/Day11.scala | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala index 0a37ab67..43e4de94 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala @@ -88,10 +88,15 @@ object Day11 { @tailrec def helper(prevDevice: Device, acc: Long, via: List[Device]): Long = via match { case Nil => acc * countPathsFromTo(prevDevice, to) - case device :: newVia => helper(device, acc * countPathsFromTo(prevDevice, device), newVia) // TODO: optimize: stop when countPathsFromTo is zero + case device :: newVia => + val newAcc = countPathsFromTo(prevDevice, device) + if (newAcc == 0) + 0 // this step is impossible, so no need to continue (multiplying 0) + else + helper(device, acc * newAcc, newVia) } - via.toList.permutations.map(helper(from, 1L, _)).sum // TODO: optimize: only one can be non-zero, stop on first + via.toList.permutations.map(helper(from, 1L, _)).find(_ != 0).get // this could be a sum, but only one vias permutation can be non-zero, so stop after finding that one, no need to continue (adding 0s) } } From da0c8cc8a286548ca9c5f125ea9711a0dd6230a0 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Thu, 11 Dec 2025 20:45:26 +0200 Subject: [PATCH 76/99] Add optimized via pair solution to 2025 day 11 --- .../eu/sim642/adventofcode2025/Day11.scala | 39 +++++++++++++++++++ .../sim642/adventofcode2025/Day11Test.scala | 3 ++ 2 files changed, 42 insertions(+) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala index 43e4de94..2c62f722 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala @@ -59,6 +59,45 @@ object Day11 { override object Part2 extends ViaMapPartSolution with Part2Devices } + /** + * Optimized version of [[ViaMapSolution]], which only keeps the largest key pair from the mapping. + * Others are useless for passing all the vias. + */ + object ViaPairSolution extends Solution { + trait ViaPairPartSolution extends PartSolution { + override def countPaths(devices: Devices): Long = { + val memo = mutable.Map.empty[Device, (Set[Device], Long)] + + def helper(device: Device): (Set[Device], Long) = { + memo.getOrElseUpdate(device, { + val deviceVia = via.intersect(Set(device)) + if (device == to) + deviceVia -> 1 + else { + val (a, b) = devices(device).map(helper).foldLeft(Set.empty[Device] -> 0L)({ case (a@(accVia, acc), n@(newVia, newCount)) => + if (accVia == newVia) + accVia -> (acc + newCount) + else if (accVia subsetOf newVia) + n + else if (newVia subsetOf accVia) + a + else + throw new IllegalStateException("") + }) + a.union(deviceVia) -> b + } + }) + } + + helper(from)._2 + } + } + + override object Part1 extends ViaPairPartSolution with Part1Devices + + override object Part2 extends ViaPairPartSolution with Part2Devices + } + /** * Solution, which tries all permutations of vias and counts each one by multiplying adjacent steps. */ diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala index 30fada67..d6ee97f6 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day11Test.scala @@ -7,6 +7,7 @@ import org.scalatest.funsuite.AnyFunSuite class Day11Test extends Suites( new ViaMapSolutionTest, + new ViaPairSolutionTest, new PermutationSolutionTest, ) @@ -59,5 +60,7 @@ object Day11Test { class ViaMapSolutionTest extends SolutionTest(ViaMapSolution) + class ViaPairSolutionTest extends SolutionTest(ViaPairSolution) + class PermutationSolutionTest extends SolutionTest(PermutationSolution) } From 87edbe69bac08d63a18750933f25f2d255f79e21 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Thu, 11 Dec 2025 21:07:05 +0200 Subject: [PATCH 77/99] Clean up via pair solution in 2025 day 11 --- .../eu/sim642/adventofcode2025/Day11.scala | 47 ++++++++++++------- 1 file changed, 29 insertions(+), 18 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala index 2c62f722..68da781f 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala @@ -64,37 +64,48 @@ object Day11 { * Others are useless for passing all the vias. */ object ViaPairSolution extends Solution { + + case class ViaPair(via: Set[Device], count: Long) { + infix def combine(that: ViaPair): ViaPair = { + if (via == that.via) + ViaPair(via, count + that.count) + else if (via subsetOf that.via) + that + else if (that.via subsetOf via) + this + else + throw new IllegalArgumentException("incomparable via pairs") // doesn't happen on DAG + } + + def unionVia(thatVia: Set[Device]): ViaPair = + copy(via = via union thatVia) + } + + object ViaPair { + val empty = ViaPair(Set.empty, 0) + } + trait ViaPairPartSolution extends PartSolution { override def countPaths(devices: Devices): Long = { - val memo = mutable.Map.empty[Device, (Set[Device], Long)] + val memo = mutable.Map.empty[Device, ViaPair] - def helper(device: Device): (Set[Device], Long) = { + def helper(device: Device): ViaPair = { memo.getOrElseUpdate(device, { val deviceVia = via.intersect(Set(device)) if (device == to) - deviceVia -> 1 - else { - val (a, b) = devices(device).map(helper).foldLeft(Set.empty[Device] -> 0L)({ case (a@(accVia, acc), n@(newVia, newCount)) => - if (accVia == newVia) - accVia -> (acc + newCount) - else if (accVia subsetOf newVia) - n - else if (newVia subsetOf accVia) - a - else - throw new IllegalStateException("") - }) - a.union(deviceVia) -> b - } + ViaPair(deviceVia, 1) + else + devices(device).map(helper).foldLeft(ViaPair.empty)(_ combine _).unionVia(deviceVia) }) } - helper(from)._2 + val viaPair = helper(from) + assert(viaPair.via == via) + viaPair.count } } override object Part1 extends ViaPairPartSolution with Part1Devices - override object Part2 extends ViaPairPartSolution with Part2Devices } From f6db1cacd39cf43fff072743a9304b32c416cf28 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Thu, 11 Dec 2025 22:01:35 +0200 Subject: [PATCH 78/99] Benchmark 2025 day 11 --- .../adventofcode2025/Day11Benchmark.scala | 40 +++++++++++++++++++ 1 file changed, 40 insertions(+) create mode 100644 src/test/scala/eu/sim642/adventofcode2025/Day11Benchmark.scala diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day11Benchmark.scala b/src/test/scala/eu/sim642/adventofcode2025/Day11Benchmark.scala new file mode 100644 index 00000000..83a56915 --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2025/Day11Benchmark.scala @@ -0,0 +1,40 @@ +package eu.sim642.adventofcode2025 + +import Day11.* +import org.scalameter.Bench +import org.scalameter.api.Gen + +object Day11Benchmark extends Bench.Group { + + val inputDevices = parseDevices(input) + + abstract class SolutionBenchmark(solution: Solution) extends Bench.LocalTime { + performance of solution.getClass.getSimpleName in { + performance of "Part 1" in { + measure method "countPaths" in { + using (Gen.unit("input")) in { _ => + solution.Part1.countPaths(inputDevices) + } + } + } + + performance of "Part 2" in { + measure method "countPaths" in { + using (Gen.unit("input")) in { _ => + solution.Part2.countPaths(inputDevices) + } + } + } + } + } + + class ViaMapSolutionBenchmark extends SolutionBenchmark(ViaMapSolution) + + class ViaPairSolutionBenchmark extends SolutionBenchmark(ViaPairSolution) + + class PermutationsSolutionBenchmark extends SolutionBenchmark(PermutationSolution) + + include(new ViaMapSolutionBenchmark) + include(new ViaPairSolutionBenchmark) + include(new PermutationsSolutionBenchmark) +} From ca588df7b939f4e479890704a6792936e3a4d02a Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Thu, 11 Dec 2025 22:02:18 +0200 Subject: [PATCH 79/99] Optimized via pair solution in 2025 day 11 --- .../eu/sim642/adventofcode2025/Day11.scala | 19 +++++++++---------- 1 file changed, 9 insertions(+), 10 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala index 68da781f..2e44463d 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala @@ -62,27 +62,26 @@ object Day11 { /** * Optimized version of [[ViaMapSolution]], which only keeps the largest key pair from the mapping. * Others are useless for passing all the vias. + * Also, just the size of the visited vias set is tracked, because incompatible sets can't arise. */ object ViaPairSolution extends Solution { - case class ViaPair(via: Set[Device], count: Long) { + case class ViaPair(via: Int, count: Long) { infix def combine(that: ViaPair): ViaPair = { if (via == that.via) ViaPair(via, count + that.count) - else if (via subsetOf that.via) + else if (via < that.via) that - else if (that.via subsetOf via) + else // that.via < via this - else - throw new IllegalArgumentException("incomparable via pairs") // doesn't happen on DAG } - def unionVia(thatVia: Set[Device]): ViaPair = - copy(via = via union thatVia) + def unionVia(thatVia: Int): ViaPair = + copy(via = via + thatVia) } object ViaPair { - val empty = ViaPair(Set.empty, 0) + val empty = ViaPair(0, 0) } trait ViaPairPartSolution extends PartSolution { @@ -91,7 +90,7 @@ object Day11 { def helper(device: Device): ViaPair = { memo.getOrElseUpdate(device, { - val deviceVia = via.intersect(Set(device)) + val deviceVia = if (via(device)) 1 else 0 if (device == to) ViaPair(deviceVia, 1) else @@ -100,7 +99,7 @@ object Day11 { } val viaPair = helper(from) - assert(viaPair.via == via) + assert(viaPair.via == via.size) viaPair.count } } From 4f266c1eaa033266350489b2e0c1c16a7f6f0d63 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Thu, 11 Dec 2025 22:05:54 +0200 Subject: [PATCH 80/99] Use via pair solution in 2025 day 11 by default --- src/main/scala/eu/sim642/adventofcode2025/Day11.scala | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala index 2e44463d..68539ff3 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day11.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day11.scala @@ -162,7 +162,7 @@ object Day11 { lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day11.txt")).mkString.trim def main(args: Array[String]): Unit = { - import ViaMapSolution._ + import ViaPairSolution._ println(Part1.countPaths(parseDevices(input))) println(Part2.countPaths(parseDevices(input))) From 49cefcc3e19ede716838f8818346298018bfa458 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Fri, 12 Dec 2025 08:20:02 +0200 Subject: [PATCH 81/99] Solve 2025 day 12 part 1 --- .../eu/sim642/adventofcode2025/day12.txt | 1030 +++++++++++++++++ .../eu/sim642/adventofcode2025/Day12.scala | 133 +++ .../sim642/adventofcode2025/Day12Test.scala | 55 + 3 files changed, 1218 insertions(+) create mode 100644 src/main/resources/eu/sim642/adventofcode2025/day12.txt create mode 100644 src/main/scala/eu/sim642/adventofcode2025/Day12.scala create mode 100644 src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala diff --git a/src/main/resources/eu/sim642/adventofcode2025/day12.txt b/src/main/resources/eu/sim642/adventofcode2025/day12.txt new file mode 100644 index 00000000..6f6e73af --- /dev/null +++ b/src/main/resources/eu/sim642/adventofcode2025/day12.txt @@ -0,0 +1,1030 @@ +0: +##. +### +#.# + +1: +### +### +..# + +2: +### +..# +### + +3: +#.. +##. +### + +4: +#.# +### +#.# + +5: +#.. +##. +.## + +47x47: 38 32 39 37 41 38 +46x48: 40 41 40 35 38 46 +46x35: 37 40 37 44 48 43 +41x38: 27 27 17 29 28 28 +37x39: 39 39 36 37 35 36 +46x35: 26 28 27 21 31 31 +41x42: 28 22 31 42 30 28 +45x47: 40 43 26 41 35 40 +43x36: 39 42 35 40 37 48 +47x47: 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b/src/main/scala/eu/sim642/adventofcode2025/Day12.scala @@ -0,0 +1,133 @@ +package eu.sim642.adventofcode2025 + +import eu.sim642.adventofcodelib.Grid +import eu.sim642.adventofcodelib.pos.Pos +import eu.sim642.adventofcodelib.IteratorImplicits.* +import eu.sim642.adventofcode2020.Day20.OrientationGridOps +import eu.sim642.adventofcodelib.GridImplicits._ +import eu.sim642.adventofcodelib.box.Box + +object Day12 { + + type Shape = Grid[Boolean] + + case class Region(size: Pos, shapeCounts: Seq[Int]) + + case class Input(shapes: Seq[Shape], regions: Seq[Region]) + + /*def fits(shapes: Seq[Shape])(region: Region): Boolean = { + + def helper(grid: Grid[Boolean], shapeCounts: Seq[Int]): Boolean = { + val shapeI = shapeCounts.indexWhere(_ > 0) + if (shapeI < 0) + true // nothing more to fit + else { + val newShapeCounts = shapeCounts.updated(shapeI, shapeCounts(shapeI) - 1) + val shape = shapes(shapeI) + (for { + shapeOrientation <- shape.orientations.iterator + shapeOrientationSize = Pos(shapeOrientation(0).size, shapeOrientation.size) + shapeOrientationBox = Box(Pos.zero, region.size - shapeOrientationSize) + shapeOrientationBox2 = Box(Pos.zero, shapeOrientationSize - Pos(1, 1)) + pos <- shapeOrientationBox.iterator + if shapeOrientationBox2.iterator.forall(p => !(shapeOrientation(p) && grid(pos + p))) + newGrid = shapeOrientationBox2.iterator.foldLeft(grid)((newGrid, p) => newGrid.updatedGrid(pos + p, true)) + } yield helper(newGrid, newShapeCounts)).exists(identity) + } + } + + val initialGrid = Vector.fill(region.size.y, region.size.x)(false) + helper(initialGrid, region.shapeCounts) + }*/ + + + /*// probably broken: skips over poss when finding place for a shape + def fits(shapes: Seq[Shape])(region: Region): Boolean = { + val shapeOrientationBox = Box(Pos.zero, region.size - Pos(3, 3)) // assuming all shappes of same size + + def helper(grid: Grid[Boolean], shapeCounts: Seq[Int], poss: List[Pos]): Boolean = { + val shapeI = shapeCounts.indexWhere(_ > 0) + if (shapeI < 0) + true // nothing more to fit + else { + val newShapeCounts = shapeCounts.updated(shapeI, shapeCounts(shapeI) - 1) + val shape = shapes(shapeI) + (for { + shapeOrientation <- shape.orientations.iterator + shapeOrientationSize = Pos(shapeOrientation(0).size, shapeOrientation.size) + shapeOrientationBox2 = Box(Pos.zero, shapeOrientationSize - Pos(1, 1)) + case pos :: newPoss <- poss.tails + if shapeOrientationBox2.iterator.forall(p => !(shapeOrientation(p) && grid(pos + p))) + newGrid = shapeOrientationBox2.iterator.foldLeft(grid)((newGrid, p) => newGrid.updatedGrid(pos + p, shapeOrientation(p))) + } yield helper(newGrid, newShapeCounts, newPoss)).exists(identity) + } + } + + val initialGrid = Vector.fill(region.size.y, region.size.x)(false) + helper(initialGrid, region.shapeCounts, shapeOrientationBox.iterator.toList) + }*/ + + + /*def fits(shapes: Seq[Shape])(region: Region): Boolean = { + val shapeOrientationBox = Box(Pos.zero, region.size - Pos(3, 3)) // assuming all shappes of same size + + def helper(grid: Grid[Boolean], shapeCounts: Seq[Int], poss: List[Pos]): Boolean = { + val shapeI = shapeCounts.indexWhere(_ > 0) + if (shapeI < 0) + true // nothing more to fit + else { + //val newShapeCounts = shapeCounts.updated(shapeI, shapeCounts(shapeI) - 1) + //val shape = shapes(shapeI) + if (poss.isEmpty) + false + else { + val pos = poss.head + val newPoss = poss.tail + (for { + ((shape, count), shapeI) <- shapes.lazyZip(shapeCounts).zipWithIndex + if count > 0 + newShapeCounts = shapeCounts.updated(shapeI, count - 1) + shapeOrientation <- shape.orientations.iterator + shapeOrientationSize = Pos(shapeOrientation(0).size, shapeOrientation.size) + shapeOrientationBox2 = Box(Pos.zero, shapeOrientationSize - Pos(1, 1)) + if shapeOrientationBox2.iterator.forall(p => !(shapeOrientation(p) && grid(pos + p))) + newGrid = shapeOrientationBox2.iterator.foldLeft(grid)((newGrid, p) => newGrid.updatedGrid(pos + p, shapeOrientation(p))) + } yield helper(newGrid, newShapeCounts, newPoss)).exists(identity) || helper(grid, shapeCounts, newPoss) // or don't place anything here + } + } + } + + val initialGrid = Vector.fill(region.size.y, region.size.x)(false) + helper(initialGrid, region.shapeCounts, shapeOrientationBox.iterator.toList) + }*/ + + // cheat solution + def fits(shapes: Seq[Shape])(region: Region): Boolean = { + shapes + .map(_.countGrid(identity)) + .lazyZip(region.shapeCounts) + .map(_ * _) + .sum <= Box(Pos.zero, region.size - Pos(1, 1)).size[Int] + } + + def countFits(input: Input): Int = + input.regions.count(fits(input.shapes)) + + def parseShape(s: String): Shape = s.linesIterator.tail.map(_.map(_ == '#').toVector).toVector + + def parseRegion(s: String): Region = s match { + case s"${width}x$height: $shapeCounts" => + Region(Pos(width.toInt, height.toInt), shapeCounts.split(" ").map(_.toInt).toSeq) + } + + def parseInput(input: String): Input = { + val lineGroups = input.split("\n\n").toSeq + Input(lineGroups.init.map(parseShape), lineGroups.last.linesIterator.map(parseRegion).toSeq) + } + + lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day12.txt")).mkString.trim + + def main(args: Array[String]): Unit = { + println(countFits(parseInput(input))) + } +} diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala new file mode 100644 index 00000000..628effc2 --- /dev/null +++ b/src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala @@ -0,0 +1,55 @@ +package eu.sim642.adventofcode2025 + +import Day12._ +import org.scalatest.funsuite.AnyFunSuite + +class Day12Test extends AnyFunSuite { + + val exampleInput = + """0: + |### + |##. + |##. + | + |1: + |### + |##. + |.## + | + |2: + |.## + |### + |##. + | + |3: + |##. + |### + |##. + | + |4: + |### + |#.. + |### + | + |5: + |### + |.#. + |### + | + |4x4: 0 0 0 0 2 0 + |12x5: 1 0 1 0 2 2 + |12x5: 1 0 1 0 3 2""".stripMargin + + ignore("Part 1 examples") { + val input1 = parseInput(exampleInput) + //assert(fits(input1.shapes)(input1.regions(0))) + //assert(fits(input1.shapes)(input1.regions(1))) + //assert(!fits(input1.shapes)(input1.regions(2))) + assert(countFits(input1) == 2) // doesn't work with cheat solution + //parseInput(input) + } + + test("Part 1 input answer") { + assert(countFits(parseInput(input)) == 443) + } +} From af3bd5b12fdf6160da16c404babe71357c50ce21 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Fri, 12 Dec 2025 08:35:01 +0200 Subject: [PATCH 82/99] Clean up 2025 day 12 --- .../eu/sim642/adventofcode2025/Day12.scala | 93 +++++++++++-------- .../sim642/adventofcode2025/Day12Test.scala | 10 +- 2 files changed, 61 insertions(+), 42 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day12.scala b/src/main/scala/eu/sim642/adventofcode2025/Day12.scala index 95e388e1..2ed7f7c2 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day12.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day12.scala @@ -15,7 +15,15 @@ object Day12 { case class Input(shapes: Seq[Shape], regions: Seq[Region]) - /*def fits(shapes: Seq[Shape])(region: Region): Boolean = { + trait Solution { + def fits(shapes: Seq[Shape])(region: Region): Boolean + + def countFits(input: Input): Int = + input.regions.count(fits(input.shapes)) + } + + object NaiveSolution extends Solution { + /*def fits(shapes: Seq[Shape])(region: Region): Boolean = { def helper(grid: Grid[Boolean], shapeCounts: Seq[Int]): Boolean = { val shapeI = shapeCounts.indexWhere(_ > 0) @@ -40,35 +48,33 @@ object Day12 { helper(initialGrid, region.shapeCounts) }*/ + // probably broken: skips over poss when finding place for a shape + override def fits(shapes: Seq[Shape])(region: Region): Boolean = { + val shapeOrientationBox = Box(Pos.zero, region.size - Pos(3, 3)) // assuming all shappes of same size - /*// probably broken: skips over poss when finding place for a shape - def fits(shapes: Seq[Shape])(region: Region): Boolean = { - val shapeOrientationBox = Box(Pos.zero, region.size - Pos(3, 3)) // assuming all shappes of same size - - def helper(grid: Grid[Boolean], shapeCounts: Seq[Int], poss: List[Pos]): Boolean = { - val shapeI = shapeCounts.indexWhere(_ > 0) - if (shapeI < 0) - true // nothing more to fit - else { - val newShapeCounts = shapeCounts.updated(shapeI, shapeCounts(shapeI) - 1) - val shape = shapes(shapeI) - (for { - shapeOrientation <- shape.orientations.iterator - shapeOrientationSize = Pos(shapeOrientation(0).size, shapeOrientation.size) - shapeOrientationBox2 = Box(Pos.zero, shapeOrientationSize - Pos(1, 1)) - case pos :: newPoss <- poss.tails - if shapeOrientationBox2.iterator.forall(p => !(shapeOrientation(p) && grid(pos + p))) - newGrid = shapeOrientationBox2.iterator.foldLeft(grid)((newGrid, p) => newGrid.updatedGrid(pos + p, shapeOrientation(p))) - } yield helper(newGrid, newShapeCounts, newPoss)).exists(identity) + def helper(grid: Grid[Boolean], shapeCounts: Seq[Int], poss: List[Pos]): Boolean = { + val shapeI = shapeCounts.indexWhere(_ > 0) + if (shapeI < 0) + true // nothing more to fit + else { + val newShapeCounts = shapeCounts.updated(shapeI, shapeCounts(shapeI) - 1) + val shape = shapes(shapeI) + (for { + shapeOrientation <- shape.orientations.iterator + shapeOrientationSize = Pos(shapeOrientation(0).size, shapeOrientation.size) + shapeOrientationBox2 = Box(Pos.zero, shapeOrientationSize - Pos(1, 1)) + case pos :: newPoss <- poss.tails + if shapeOrientationBox2.iterator.forall(p => !(shapeOrientation(p) && grid(pos + p))) + newGrid = shapeOrientationBox2.iterator.foldLeft(grid)((newGrid, p) => newGrid.updatedGrid(pos + p, shapeOrientation(p))) + } yield helper(newGrid, newShapeCounts, newPoss)).exists(identity) + } } - } - - val initialGrid = Vector.fill(region.size.y, region.size.x)(false) - helper(initialGrid, region.shapeCounts, shapeOrientationBox.iterator.toList) - }*/ + val initialGrid = Vector.fill(region.size.y, region.size.x)(false) + helper(initialGrid, region.shapeCounts, shapeOrientationBox.iterator.toList) + } - /*def fits(shapes: Seq[Shape])(region: Region): Boolean = { + /*def fits(shapes: Seq[Shape])(region: Region): Boolean = { val shapeOrientationBox = Box(Pos.zero, region.size - Pos(3, 3)) // assuming all shappes of same size def helper(grid: Grid[Boolean], shapeCounts: Seq[Int], poss: List[Pos]): Boolean = { @@ -100,18 +106,31 @@ object Day12 { val initialGrid = Vector.fill(region.size.y, region.size.x)(false) helper(initialGrid, region.shapeCounts, shapeOrientationBox.iterator.toList) }*/ - - // cheat solution - def fits(shapes: Seq[Shape])(region: Region): Boolean = { - shapes - .map(_.countGrid(identity)) - .lazyZip(region.shapeCounts) - .map(_ * _) - .sum <= Box(Pos.zero, region.size - Pos(1, 1)).size[Int] } - def countFits(input: Input): Int = - input.regions.count(fits(input.shapes)) + object SanitySolution extends Solution { + override def fits(shapes: Seq[Shape])(region: Region): Boolean = { + val area = Box(Pos(1, 1), region.size).size[Int] + val areaLowerBound = // only counting the #-s in shapes + shapes + .map(_.countGrid(identity)) + .lazyZip(region.shapeCounts) + .map(_ * _) + .sum + val areaUpperBound = // counting area needed if no "overlaps" are possible + shapes + .map(_.sizeGrid) + .lazyZip(region.shapeCounts) + .map(_ * _) + .sum + if (areaUpperBound <= area) + true + else if (areaLowerBound > area) + false + else + throw IllegalArgumentException("undecidable by sanity check") + } + } def parseShape(s: String): Shape = s.linesIterator.tail.map(_.map(_ == '#').toVector).toVector @@ -128,6 +147,6 @@ object Day12 { lazy val input: String = scala.io.Source.fromInputStream(getClass.getResourceAsStream("day12.txt")).mkString.trim def main(args: Array[String]): Unit = { - println(countFits(parseInput(input))) + println(SanitySolution.countFits(parseInput(input))) } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala index 628effc2..41227694 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala @@ -40,16 +40,16 @@ class Day12Test extends AnyFunSuite { |12x5: 1 0 1 0 2 2 |12x5: 1 0 1 0 3 2""".stripMargin - ignore("Part 1 examples") { - val input1 = parseInput(exampleInput) + ignore("Part 1 examples") { // TODO: optimize + import NaiveSolution._ // doesn't work with cheat solution + //val input1 = parseInput(exampleInput) //assert(fits(input1.shapes)(input1.regions(0))) //assert(fits(input1.shapes)(input1.regions(1))) //assert(!fits(input1.shapes)(input1.regions(2))) - assert(countFits(input1) == 2) // doesn't work with cheat solution - //parseInput(input) + assert(countFits(parseInput(exampleInput)) == 2) } test("Part 1 input answer") { - assert(countFits(parseInput(input)) == 443) + assert(SanitySolution.countFits(parseInput(input)) == 443) } } From 314c8dd9fcbda7676c63c638c9be0e8c60ea49cf Mon Sep 17 00:00:00 2001 From: "nmc.borst" Date: Fri, 12 Dec 2025 11:08:56 +0100 Subject: [PATCH 83/99] fix comment --- src/main/scala/eu/sim642/adventofcode2025/Day10.scala | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala index 2054fde5..a1f1bc92 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -65,7 +65,7 @@ object Day10 { 0: x4 x5 = 3 1: x1 x5 = 5 2: x2 x3 x4 = 4 - 3: x0 x3 = 7 + 3: x0 x1 x3 = 7 */ override def fewestPresses(machine: Machine): Int = { From 6571b026540fd13c47376610423faaf085c54ada Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Fri, 12 Dec 2025 19:03:02 +0200 Subject: [PATCH 84/99] Optimize naive solution in 2025 day 12 Stop early based on similar sanity check heuristic. Also deduplicate orientations. --- .../eu/sim642/adventofcode2025/Day12.scala | 116 +++++++----------- .../sim642/adventofcode2025/Day12Test.scala | 10 +- 2 files changed, 50 insertions(+), 76 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day12.scala b/src/main/scala/eu/sim642/adventofcode2025/Day12.scala index 2ed7f7c2..38b2d3c3 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day12.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day12.scala @@ -23,89 +23,63 @@ object Day12 { } object NaiveSolution extends Solution { - /*def fits(shapes: Seq[Shape])(region: Region): Boolean = { - - def helper(grid: Grid[Boolean], shapeCounts: Seq[Int]): Boolean = { - val shapeI = shapeCounts.indexWhere(_ > 0) - if (shapeI < 0) - true // nothing more to fit - else { - val newShapeCounts = shapeCounts.updated(shapeI, shapeCounts(shapeI) - 1) - val shape = shapes(shapeI) - (for { - shapeOrientation <- shape.orientations.iterator - shapeOrientationSize = Pos(shapeOrientation(0).size, shapeOrientation.size) - shapeOrientationBox = Box(Pos.zero, region.size - shapeOrientationSize) - shapeOrientationBox2 = Box(Pos.zero, shapeOrientationSize - Pos(1, 1)) - pos <- shapeOrientationBox.iterator - if shapeOrientationBox2.iterator.forall(p => !(shapeOrientation(p) && grid(pos + p))) - newGrid = shapeOrientationBox2.iterator.foldLeft(grid)((newGrid, p) => newGrid.updatedGrid(pos + p, true)) - } yield helper(newGrid, newShapeCounts)).exists(identity) - } - } - - val initialGrid = Vector.fill(region.size.y, region.size.x)(false) - helper(initialGrid, region.shapeCounts) - }*/ - - // probably broken: skips over poss when finding place for a shape override def fits(shapes: Seq[Shape])(region: Region): Boolean = { val shapeOrientationBox = Box(Pos.zero, region.size - Pos(3, 3)) // assuming all shappes of same size - def helper(grid: Grid[Boolean], shapeCounts: Seq[Int], poss: List[Pos]): Boolean = { + val shapeOrientations = shapes.map(_.orientations.toSet) + + def helper(grid: Grid[Boolean], shapeCounts: Seq[Int], poss: List[Pos], depth: Int): Boolean = { + val indent = " " * depth + //println(s"$indent: $shapeCounts") + //for (row <- grid) { + // print(indent) + // for (cell <- row) + // print(if (cell) '#' else '.') + // println() + //} val shapeI = shapeCounts.indexWhere(_ > 0) if (shapeI < 0) true // nothing more to fit else { - val newShapeCounts = shapeCounts.updated(shapeI, shapeCounts(shapeI) - 1) - val shape = shapes(shapeI) - (for { - shapeOrientation <- shape.orientations.iterator - shapeOrientationSize = Pos(shapeOrientation(0).size, shapeOrientation.size) - shapeOrientationBox2 = Box(Pos.zero, shapeOrientationSize - Pos(1, 1)) - case pos :: newPoss <- poss.tails - if shapeOrientationBox2.iterator.forall(p => !(shapeOrientation(p) && grid(pos + p))) - newGrid = shapeOrientationBox2.iterator.foldLeft(grid)((newGrid, p) => newGrid.updatedGrid(pos + p, shapeOrientation(p))) - } yield helper(newGrid, newShapeCounts, newPoss)).exists(identity) + //val newShapeCounts = shapeCounts.updated(shapeI, shapeCounts(shapeI) - 1) + //val shape = shapes(shapeI) + if (poss.isEmpty) + false + else { + val pos = poss.head + //print(s"$indent $pos") + val todo = region.size.x * region.size.y - pos.x * region.size.y - pos.y + val areaLowerBound = // only counting the #-s in shapes + shapes + .map(_.countGrid(identity)) + .lazyZip(shapeCounts) + .map(_ * _) + .sum + if (areaLowerBound > todo) { + //println("bounded") + false + } else { + //println() + val newPoss = poss.tail + (for { + ((shapeO, count), shapeI) <- shapeOrientations.lazyZip(shapeCounts).zipWithIndex + if count > 0 + newShapeCounts = shapeCounts.updated(shapeI, count - 1) + shapeOrientation <- shapeO.iterator + shapeOrientationSize = Pos(shapeOrientation(0).size, shapeOrientation.size) + shapeOrientationBox2 = Box(Pos.zero, shapeOrientationSize - Pos(1, 1)) + if shapeOrientationBox2.iterator.forall(p => !(shapeOrientation(p) && grid(pos + p))) + newGrid = shapeOrientationBox2.iterator.foldLeft(grid)((newGrid, p) => newGrid.updatedGrid(pos + p, newGrid(pos + p) || shapeOrientation(p))) + } yield helper(newGrid, newShapeCounts, newPoss, depth + 1)).exists(identity) || + !Box(Pos.zero, Pos(2, 2)).iterator.forall(p => !grid(pos + p)) && helper(grid, shapeCounts, newPoss, depth + 1) // or don't place anything here + } + } } } val initialGrid = Vector.fill(region.size.y, region.size.x)(false) - helper(initialGrid, region.shapeCounts, shapeOrientationBox.iterator.toList) - } - - /*def fits(shapes: Seq[Shape])(region: Region): Boolean = { - val shapeOrientationBox = Box(Pos.zero, region.size - Pos(3, 3)) // assuming all shappes of same size - - def helper(grid: Grid[Boolean], shapeCounts: Seq[Int], poss: List[Pos]): Boolean = { - val shapeI = shapeCounts.indexWhere(_ > 0) - if (shapeI < 0) - true // nothing more to fit - else { - //val newShapeCounts = shapeCounts.updated(shapeI, shapeCounts(shapeI) - 1) - //val shape = shapes(shapeI) - if (poss.isEmpty) - false - else { - val pos = poss.head - val newPoss = poss.tail - (for { - ((shape, count), shapeI) <- shapes.lazyZip(shapeCounts).zipWithIndex - if count > 0 - newShapeCounts = shapeCounts.updated(shapeI, count - 1) - shapeOrientation <- shape.orientations.iterator - shapeOrientationSize = Pos(shapeOrientation(0).size, shapeOrientation.size) - shapeOrientationBox2 = Box(Pos.zero, shapeOrientationSize - Pos(1, 1)) - if shapeOrientationBox2.iterator.forall(p => !(shapeOrientation(p) && grid(pos + p))) - newGrid = shapeOrientationBox2.iterator.foldLeft(grid)((newGrid, p) => newGrid.updatedGrid(pos + p, shapeOrientation(p))) - } yield helper(newGrid, newShapeCounts, newPoss)).exists(identity) || helper(grid, shapeCounts, newPoss) // or don't place anything here - } - } + helper(initialGrid, region.shapeCounts, shapeOrientationBox.iterator.toList, 0) } - - val initialGrid = Vector.fill(region.size.y, region.size.x)(false) - helper(initialGrid, region.shapeCounts, shapeOrientationBox.iterator.toList) - }*/ } object SanitySolution extends Solution { diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala index 41227694..20038c6f 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day12Test.scala @@ -40,12 +40,12 @@ class Day12Test extends AnyFunSuite { |12x5: 1 0 1 0 2 2 |12x5: 1 0 1 0 3 2""".stripMargin - ignore("Part 1 examples") { // TODO: optimize + test("Part 1 examples") { import NaiveSolution._ // doesn't work with cheat solution - //val input1 = parseInput(exampleInput) - //assert(fits(input1.shapes)(input1.regions(0))) - //assert(fits(input1.shapes)(input1.regions(1))) - //assert(!fits(input1.shapes)(input1.regions(2))) + val input1 = parseInput(exampleInput) + assert(fits(input1.shapes)(input1.regions(0))) + assert(fits(input1.shapes)(input1.regions(1))) + assert(!fits(input1.shapes)(input1.regions(2))) assert(countFits(parseInput(exampleInput)) == 2) } From b095fbb832d1741c52392332fe3da6b08f057145 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Fri, 12 Dec 2025 21:05:28 +0200 Subject: [PATCH 85/99] Improve sanity check in naive solution in 2025 day 12 --- src/main/scala/eu/sim642/adventofcode2025/Day12.scala | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day12.scala b/src/main/scala/eu/sim642/adventofcode2025/Day12.scala index 38b2d3c3..a15a57f3 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day12.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day12.scala @@ -41,14 +41,12 @@ object Day12 { if (shapeI < 0) true // nothing more to fit else { - //val newShapeCounts = shapeCounts.updated(shapeI, shapeCounts(shapeI) - 1) - //val shape = shapes(shapeI) if (poss.isEmpty) false else { val pos = poss.head //print(s"$indent $pos") - val todo = region.size.x * region.size.y - pos.x * region.size.y - pos.y + val todo = region.size.x * region.size.y - pos.x * region.size.y - pos.y - (if (pos.x == shapeOrientationBox.max.x) pos.y * 2 else 0) val areaLowerBound = // only counting the #-s in shapes shapes .map(_.countGrid(identity)) From 5afa598fd6709f0188b55c66672199e81ecb0c65 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 14 Dec 2025 10:32:33 +0200 Subject: [PATCH 86/99] Add partial Gaussian elimination solution to 2025 day 10 part 2 --- .../eu/sim642/adventofcode2025/Day10.scala | 107 ++++++++++++++++-- .../sim642/adventofcode2025/Day10Test.scala | 7 +- 2 files changed, 103 insertions(+), 11 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala index a1f1bc92..0d8e8254 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -3,6 +3,7 @@ package eu.sim642.adventofcode2025 import com.microsoft.z3.{ArithExpr, Context, IntExpr, IntSort, Status} import eu.sim642.adventofcodelib.graph.{BFS, Dijkstra, GraphSearch, TargetNode, UnitNeighbors} +import scala.collection.mutable import scala.jdk.CollectionConverters.* object Day10 { @@ -59,15 +60,6 @@ object Day10 { * Solution, which finds fewest presses via an ILP problem, solved by Z3. */ object Z3Part2Solution extends Part2Solution { - /* - x0 x1 x2 x3 x4 x5 - (3) (1,3) (2) (2,3) (0,2) (0,1) - 0: x4 x5 = 3 - 1: x1 x5 = 5 - 2: x2 x3 x4 = 4 - 3: x0 x1 x3 = 7 - */ - override def fewestPresses(machine: Machine): Int = { val ctx = new Context(Map("model" -> "true").asJava) import ctx._ @@ -93,6 +85,103 @@ object Day10 { } } + object GaussianEliminationPart2Solution extends Part2Solution { + /* + x0 x1 x2 x3 x4 x5 + (3) (1,3) (2) (2,3) (0,2) (0,1) + 0: x4 x5 = 3 + 1: x1 x5 = 5 + 2: x2 x3 x4 = 4 + 3: x0 x1 x3 = 7 + + + 0 0 0 0 1 1 | 3 + 0 1 0 0 0 1 | 5 + 0 0 1 1 1 0 | 4 + 1 1 0 1 0 0 | 7 + + 1 1 0 1 0 0 | 7 + 0 1 0 0 0 1 | 5 + 0 0 1 1 1 0 | 4 + 0 0 0 0 1 1 | 3 + + 1 0 0 1 0 -1 | 2 + 0 1 0 0 0 1 | 5 + 0 0 1 1 0 -1 | 1 + 0 0 0 0 1 1 | 3 + + 1 1 1 2 1 0 | 11 + -1 1 | ? + */ + + override def fewestPresses(machine: Machine): Int = { + val zeroCol = machine.joltages.map(_ => 0) + val rows = + machine.buttons + .map(button => + button.foldLeft(zeroCol)((acc, i) => acc.updated(i, 1)) + ) + .transpose + .zip(machine.joltages) + + val m = rows.map((a, b) => (a :+ b).to(mutable.ArraySeq)).to(mutable.ArraySeq) + + def swapRows(y1: Int, y2: Int): Unit = { + val row1 = m(y1) + m(y1) = m(y2) + m(y2) = row1 + } + + def reduceDown(x: Int, y1: Int, y2: Int): Unit = { + val factor = m(y2)(x) / m(y1)(x) + for (x2 <- x until (machine.buttons.size + 1)) + m(y2)(x2) -= factor * m(y1)(x2) + } + + def reduceUp(x: Int, y1: Int, y2: Int): Unit = { + val factor = m(y2)(x) / m(y1)(x) + for (x2 <- 0 until (machine.buttons.size + 1)) // TODO: enough to also start from x? (before zeros anyway) + m(y2)(x2) -= factor * m(y1)(x2) + } + + var y = 0 + for (x <- machine.buttons.indices) { + val y2opt = m.indices.find(y2 => y2 >= y && m(y2)(x) != 0) + y2opt match { + case None => // move to next x + case Some(y2) => + swapRows(y, y2) + assert(m(y)(x) == 1) // TODO: this will probably change + + for (y3 <- (y + 1) until m.size) + reduceDown(x, y, y3) + + y += 1 + } + } + + // check consistency + for (y2 <- y until m.size) + assert(m(y2).last == 0) + + y = 0 + for (x <- machine.buttons.indices) { + if (y < m.size) { // TODO: break if y too big + if (m(y)(x) == 0) + () // move to next x + else { + for (y3 <- 0 until y) + reduceUp(x, y, y3) + + y += 1 + } + } + } + + ??? + } + } + def parseMachine(s: String): Machine = s match { case s"[$lightsStr] $buttonsStr {$joltagesStr}" => val lights = lightsStr.map(_ == '#').toVector diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala index 718bef9e..b5e4e213 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala @@ -8,7 +8,8 @@ import org.scalatest.funsuite.AnyFunSuite class Day10Test extends Suites( new Part1Test, new NaivePart2SolutionTest, - new Z3Part2SolutionTest, + //new Z3Part2SolutionTest, + new GaussianEliminationPart2SolutionTest, ) object Day10Test { @@ -39,7 +40,7 @@ object Day10Test { if (testInput) { test("Part 2 input answer") { - assert(part2Solution.sumFewestPresses(parseMachines(input)) == 17848) + //assert(part2Solution.sumFewestPresses(parseMachines(input)) == 17848) } } } @@ -49,4 +50,6 @@ object Day10Test { } class Z3Part2SolutionTest extends Part2SolutionTest(Z3Part2Solution) + + class GaussianEliminationPart2SolutionTest extends Part2SolutionTest(GaussianEliminationPart2Solution) } From 705dee74e0b1bb95b56a84514c34e1a2229724bd Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 14 Dec 2025 10:58:37 +0200 Subject: [PATCH 87/99] Add broken free variable brute force to Gaussian elimination solution in 2025 day 10 part 2 --- .../eu/sim642/adventofcode2025/Day10.scala | 43 +++++++++++++++++-- 1 file changed, 40 insertions(+), 3 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala index 0d8e8254..cac1c55d 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -1,5 +1,7 @@ package eu.sim642.adventofcode2025 +import eu.sim642.adventofcodelib.IteratorImplicits._ + import com.microsoft.z3.{ArithExpr, Context, IntExpr, IntSort, Status} import eu.sim642.adventofcodelib.graph.{BFS, Dijkstra, GraphSearch, TargetNode, UnitNeighbors} @@ -164,21 +166,56 @@ object Day10 { for (y2 <- y until m.size) assert(m(y2).last == 0) + val mainVars = mutable.ArrayBuffer.empty[Int] + val freeVars = mutable.ArrayBuffer.empty[Int] y = 0 for (x <- machine.buttons.indices) { if (y < m.size) { // TODO: break if y too big - if (m(y)(x) == 0) - () // move to next x + if (m(y)(x) == 0) { + freeVars += x + () + } // move to next x else { + mainVars += x for (y3 <- 0 until y) reduceUp(x, y, y3) y += 1 } } + else + freeVars += x // can't break if this is here + } + + def helper0(sum: Int, len: Int): Iterator[List[Int]] = { + if (len == 0) + Iterator(Nil) + else if (len == 1) + Iterator(List(sum)) + else { + for { + x <- (0 to sum).iterator + rest <- helper0(sum - x, len - 1) + } yield x :: rest + } } - ??? + val choices = Iterator.from(0).flatMap(helper0(_, freeVars.size)) + val answer = + choices + .map(freeVals => { + val mainVals = mainVars.view.zipWithIndex.map((mainVar, y) => { + val row = m(y) + row.last - (freeVars lazyZip freeVals).map((freeVar, freeVal) => row(freeVar) * freeVal).sum + }).toList + (mainVals, freeVals) + }) + .filter(_._1.forall(_ >= 0)) // all main vals must be non-negative + .map((s1, s2) => s1.sum + s2.sum) + .head // TODO: wrong, freeVals sum is minimal, but mainVals sum isn't + + println(answer) + answer } } From 69efb442350b91787ecf0b86f6d6b008e5ff9832 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 14 Dec 2025 12:00:17 +0200 Subject: [PATCH 88/99] Finish Gaussian elimination solution in 2025 day 10 part 2 --- .../eu/sim642/adventofcode2025/Day10.scala | 79 ++++++++++++++----- .../sim642/adventofcode2025/Day10Test.scala | 2 +- 2 files changed, 59 insertions(+), 22 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala index cac1c55d..a94fc182 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -1,8 +1,8 @@ package eu.sim642.adventofcode2025 -import eu.sim642.adventofcodelib.IteratorImplicits._ - +import eu.sim642.adventofcodelib.IteratorImplicits.* import com.microsoft.z3.{ArithExpr, Context, IntExpr, IntSort, Status} +import eu.sim642.adventofcodelib.NumberTheory import eu.sim642.adventofcodelib.graph.{BFS, Dijkstra, GraphSearch, TargetNode, UnitNeighbors} import scala.collection.mutable @@ -117,16 +117,16 @@ object Day10 { */ override def fewestPresses(machine: Machine): Int = { - val zeroCol = machine.joltages.map(_ => 0) + val zeroCol = machine.joltages.map(_ => 0L) val rows = machine.buttons .map(button => - button.foldLeft(zeroCol)((acc, i) => acc.updated(i, 1)) + button.foldLeft(zeroCol)((acc, i) => acc.updated(i, 1L)) ) .transpose - .zip(machine.joltages) + .zip(machine.joltages.map(_.toLong)) - val m = rows.map((a, b) => (a :+ b).to(mutable.ArraySeq)).to(mutable.ArraySeq) + val m: mutable.ArraySeq[mutable.ArraySeq[Long]] = rows.map((a, b) => (a :+ b).to(mutable.ArraySeq)).to(mutable.ArraySeq) def swapRows(y1: Int, y2: Int): Unit = { val row1 = m(y1) @@ -134,7 +134,18 @@ object Day10 { m(y2) = row1 } + def multiplyRow(y: Int, factor: Long): Unit = { + for (x2 <- 0 until (machine.buttons.size + 1)) + m(y)(x2) *= factor.toLong + } + def reduceDown(x: Int, y1: Int, y2: Int): Unit = { + val c1 = m(y1)(x) + assert(c1 > 0) + val c2 = m(y2)(x) + val cd = NumberTheory.lcm(c1, c2.abs) + multiplyRow(y1, cd / c1) + multiplyRow(y2, cd / c2) val factor = m(y2)(x) / m(y1)(x) for (x2 <- x until (machine.buttons.size + 1)) m(y2)(x2) -= factor * m(y1)(x2) @@ -153,10 +164,13 @@ object Day10 { case None => // move to next x case Some(y2) => swapRows(y, y2) - assert(m(y)(x) == 1) // TODO: this will probably change + multiplyRow(y, m(y)(x).sign) // make leading coeff positive + //assert(m(y)(x).abs == 1) // TODO: this will probably change - for (y3 <- (y + 1) until m.size) - reduceDown(x, y, y3) + for (y3 <- (y + 1) until m.size) { + if (m(y3)(x) != 0) + reduceDown(x, y, y3) + } y += 1 } @@ -177,8 +191,12 @@ object Day10 { } // move to next x else { mainVars += x - for (y3 <- 0 until y) - reduceUp(x, y, y3) + multiplyRow(y, m(y)(x).sign) // make leading coeff positive + for (y3 <- 0 until y) { + if (m(y3)(x) != 0) + //reduceUp(x, y, y3) + reduceDown(x, y, y3) + } y += 1 } @@ -187,6 +205,8 @@ object Day10 { freeVars += x // can't break if this is here } + //val mSum = m.transpose.map(_.sum) // TODO: use? + def helper0(sum: Int, len: Int): Iterator[List[Int]] = { if (len == 0) Iterator(Nil) @@ -200,22 +220,39 @@ object Day10 { } } - val choices = Iterator.from(0).flatMap(helper0(_, freeVars.size)) + def eval(freeVals: List[Int]): List[Long] = { + val mainVals = mainVars.view.zipWithIndex.map((mainVar, y) => { + val row = m(y) + val r = row.last - (freeVars lazyZip freeVals).map((freeVar, freeVal) => row(freeVar) * freeVal).sum + if (r % row(mainVar) == 0) + r / row(mainVar) + else + -1 + }).toList + mainVals + } + + // TODO: avoid double search... + val bound = + Iterator.from(0) + .flatMap(helper0(_, freeVars.size)) + .map(freeVals => (eval(freeVals), freeVals)) + .filter(_._1.forall(_ >= 0)) // all main vals must be non-negative + .map((s1, s2) => s1.sum + s2.sum) + .head + val choices = (0 to bound.toInt).iterator.flatMap(helper0(_, freeVars.size)) + val answer = choices - .map(freeVals => { - val mainVals = mainVars.view.zipWithIndex.map((mainVar, y) => { - val row = m(y) - row.last - (freeVars lazyZip freeVals).map((freeVar, freeVal) => row(freeVar) * freeVal).sum - }).toList - (mainVals, freeVals) - }) + .map(freeVals => (eval(freeVals), freeVals)) + //.take(1000) // TODO: when to stop? + //.tapEach(println) .filter(_._1.forall(_ >= 0)) // all main vals must be non-negative .map((s1, s2) => s1.sum + s2.sum) - .head // TODO: wrong, freeVals sum is minimal, but mainVals sum isn't + .min // TODO: wrong, freeVals sum is minimal, but mainVals sum isn't println(answer) - answer + answer.toInt } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala index b5e4e213..fb1966e1 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala @@ -40,7 +40,7 @@ object Day10Test { if (testInput) { test("Part 2 input answer") { - //assert(part2Solution.sumFewestPresses(parseMachines(input)) == 17848) + assert(part2Solution.sumFewestPresses(parseMachines(input)) == 17848) } } } From 39501308957b4a9d9b06c2eb1b417cc02fdb1289 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 14 Dec 2025 12:12:14 +0200 Subject: [PATCH 89/99] Optimize Gaussian elimination solution in 2025 day 10 part 2 by using maximum button bounds --- .../eu/sim642/adventofcode2025/Day10.scala | 40 ++++++++----------- 1 file changed, 16 insertions(+), 24 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala index a94fc182..f6d69988 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -207,16 +207,18 @@ object Day10 { //val mSum = m.transpose.map(_.sum) // TODO: use? - def helper0(sum: Int, len: Int): Iterator[List[Int]] = { - if (len == 0) - Iterator(Nil) - else if (len == 1) - Iterator(List(sum)) - else { - for { - x <- (0 to sum).iterator - rest <- helper0(sum - x, len - 1) - } yield x :: rest + val maxVals = machine.buttons.map(_.map(machine.joltages(_)).min) + + def helper0(sum: Int, maxs: List[Int]): Iterator[List[Int]] = { + maxs match { + case Nil => Iterator(Nil) + case List(m) if sum <= m => Iterator(List(sum)) + case List(m) => Iterator.empty + case m :: newMaxs => + for { + x <- (0 to (m min sum)).iterator + rest <- helper0(sum - x, newMaxs) + } yield x :: rest } } @@ -232,26 +234,16 @@ object Day10 { mainVals } - // TODO: avoid double search... - val bound = - Iterator.from(0) - .flatMap(helper0(_, freeVars.size)) - .map(freeVals => (eval(freeVals), freeVals)) - .filter(_._1.forall(_ >= 0)) // all main vals must be non-negative - .map((s1, s2) => s1.sum + s2.sum) - .head - val choices = (0 to bound.toInt).iterator.flatMap(helper0(_, freeVars.size)) + val bound = freeVars.map(maxVals).sum + val choices = (0 to bound).iterator.flatMap(helper0(_, freeVars.map(maxVals).toList)) val answer = choices .map(freeVals => (eval(freeVals), freeVals)) - //.take(1000) // TODO: when to stop? - //.tapEach(println) - .filter(_._1.forall(_ >= 0)) // all main vals must be non-negative + .filter(p => p._1.forall(_ >= 0) && (p._1 lazyZip mainVars).forall((a, b) => a <= maxVals(b))) // all main vals must be non-negative, but at most their max .map((s1, s2) => s1.sum + s2.sum) - .min // TODO: wrong, freeVals sum is minimal, but mainVals sum isn't + .min - println(answer) answer.toInt } } From d40f53978b13848a29fcfe798230db21401ba966 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 14 Dec 2025 14:50:51 +0200 Subject: [PATCH 90/99] Simplify integer Gaussian elimination in 2025 day 10 part 2 --- .../eu/sim642/adventofcode2025/Day10.scala | 50 ++++++++----------- 1 file changed, 22 insertions(+), 28 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala index f6d69988..ad5133de 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -136,25 +136,28 @@ object Day10 { def multiplyRow(y: Int, factor: Long): Unit = { for (x2 <- 0 until (machine.buttons.size + 1)) - m(y)(x2) *= factor.toLong + m(y)(x2) *= factor } - def reduceDown(x: Int, y1: Int, y2: Int): Unit = { - val c1 = m(y1)(x) - assert(c1 > 0) - val c2 = m(y2)(x) - val cd = NumberTheory.lcm(c1, c2.abs) - multiplyRow(y1, cd / c1) - multiplyRow(y2, cd / c2) - val factor = m(y2)(x) / m(y1)(x) - for (x2 <- x until (machine.buttons.size + 1)) - m(y2)(x2) -= factor * m(y1)(x2) + def simplifyRow(y: Int): Unit = { + val factor = NumberTheory.gcd(m(y).toSeq) // TODO: avoid conversion + if (factor.abs > 1) { + for (x2 <- 0 until (machine.buttons.size + 1)) + m(y)(x2) /= factor + } } - def reduceUp(x: Int, y1: Int, y2: Int): Unit = { - val factor = m(y2)(x) / m(y1)(x) - for (x2 <- 0 until (machine.buttons.size + 1)) // TODO: enough to also start from x? (before zeros anyway) - m(y2)(x2) -= factor * m(y1)(x2) + def reduceDown(x: Int, y1: Int, y2: Int): Unit = { + val c2 = m(y2)(x) + if (c2 != 0) { + val c1 = m(y1)(x) + val (_, _, (factor, factor2)) = NumberTheory.extendedGcd(c1, c2) + for (x2 <- 0 until x) // must start from 0 because we're now multiplying entire row y2 + m(y2)(x2) = factor2 * m(y2)(x2) + for (x2 <- x until (machine.buttons.size + 1)) + m(y2)(x2) = factor2 * m(y2)(x2) + factor * m(y1)(x2) + //simplifyRow(y2) + } } var y = 0 @@ -164,13 +167,8 @@ object Day10 { case None => // move to next x case Some(y2) => swapRows(y, y2) - multiplyRow(y, m(y)(x).sign) // make leading coeff positive - //assert(m(y)(x).abs == 1) // TODO: this will probably change - - for (y3 <- (y + 1) until m.size) { - if (m(y3)(x) != 0) - reduceDown(x, y, y3) - } + for (y3 <- (y + 1) until m.size) + reduceDown(x, y, y3) y += 1 } @@ -191,12 +189,8 @@ object Day10 { } // move to next x else { mainVars += x - multiplyRow(y, m(y)(x).sign) // make leading coeff positive - for (y3 <- 0 until y) { - if (m(y3)(x) != 0) - //reduceUp(x, y, y3) - reduceDown(x, y, y3) - } + for (y3 <- 0 until y) + reduceDown(x, y, y3) y += 1 } From a1a26b4fc8ee9efe98a8a7773a0f3a89a152ceea Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 14 Dec 2025 16:12:21 +0200 Subject: [PATCH 91/99] Extract GaussianElimination to library --- .../eu/sim642/adventofcode2025/Day10.scala | 96 +--------------- .../adventofcodelib/GaussianElimination.scala | 108 ++++++++++++++++++ 2 files changed, 114 insertions(+), 90 deletions(-) create mode 100644 src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala index ad5133de..c25fd351 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -2,7 +2,7 @@ package eu.sim642.adventofcode2025 import eu.sim642.adventofcodelib.IteratorImplicits.* import com.microsoft.z3.{ArithExpr, Context, IntExpr, IntSort, Status} -import eu.sim642.adventofcodelib.NumberTheory +import eu.sim642.adventofcodelib.{GaussianElimination, NumberTheory} import eu.sim642.adventofcodelib.graph.{BFS, Dijkstra, GraphSearch, TargetNode, UnitNeighbors} import scala.collection.mutable @@ -124,80 +124,8 @@ object Day10 { button.foldLeft(zeroCol)((acc, i) => acc.updated(i, 1L)) ) .transpose - .zip(machine.joltages.map(_.toLong)) - val m: mutable.ArraySeq[mutable.ArraySeq[Long]] = rows.map((a, b) => (a :+ b).to(mutable.ArraySeq)).to(mutable.ArraySeq) - - def swapRows(y1: Int, y2: Int): Unit = { - val row1 = m(y1) - m(y1) = m(y2) - m(y2) = row1 - } - - def multiplyRow(y: Int, factor: Long): Unit = { - for (x2 <- 0 until (machine.buttons.size + 1)) - m(y)(x2) *= factor - } - - def simplifyRow(y: Int): Unit = { - val factor = NumberTheory.gcd(m(y).toSeq) // TODO: avoid conversion - if (factor.abs > 1) { - for (x2 <- 0 until (machine.buttons.size + 1)) - m(y)(x2) /= factor - } - } - - def reduceDown(x: Int, y1: Int, y2: Int): Unit = { - val c2 = m(y2)(x) - if (c2 != 0) { - val c1 = m(y1)(x) - val (_, _, (factor, factor2)) = NumberTheory.extendedGcd(c1, c2) - for (x2 <- 0 until x) // must start from 0 because we're now multiplying entire row y2 - m(y2)(x2) = factor2 * m(y2)(x2) - for (x2 <- x until (machine.buttons.size + 1)) - m(y2)(x2) = factor2 * m(y2)(x2) + factor * m(y1)(x2) - //simplifyRow(y2) - } - } - - var y = 0 - for (x <- machine.buttons.indices) { - val y2opt = m.indices.find(y2 => y2 >= y && m(y2)(x) != 0) - y2opt match { - case None => // move to next x - case Some(y2) => - swapRows(y, y2) - for (y3 <- (y + 1) until m.size) - reduceDown(x, y, y3) - - y += 1 - } - } - - // check consistency - for (y2 <- y until m.size) - assert(m(y2).last == 0) - - val mainVars = mutable.ArrayBuffer.empty[Int] - val freeVars = mutable.ArrayBuffer.empty[Int] - y = 0 - for (x <- machine.buttons.indices) { - if (y < m.size) { // TODO: break if y too big - if (m(y)(x) == 0) { - freeVars += x - () - } // move to next x - else { - mainVars += x - for (y3 <- 0 until y) - reduceDown(x, y, y3) - - y += 1 - } - } - else - freeVars += x // can't break if this is here - } + val sol = GaussianElimination.solve(rows, machine.joltages.map(_.toLong)) //val mSum = m.transpose.map(_.sum) // TODO: use? @@ -216,25 +144,13 @@ object Day10 { } } - def eval(freeVals: List[Int]): List[Long] = { - val mainVals = mainVars.view.zipWithIndex.map((mainVar, y) => { - val row = m(y) - val r = row.last - (freeVars lazyZip freeVals).map((freeVar, freeVal) => row(freeVar) * freeVal).sum - if (r % row(mainVar) == 0) - r / row(mainVar) - else - -1 - }).toList - mainVals - } - - val bound = freeVars.map(maxVals).sum - val choices = (0 to bound).iterator.flatMap(helper0(_, freeVars.map(maxVals).toList)) + val bound = sol.freeVars.map(maxVals).sum + val choices = (0 to bound).iterator.flatMap(helper0(_, sol.freeVars.map(maxVals).toList)) val answer = choices - .map(freeVals => (eval(freeVals), freeVals)) - .filter(p => p._1.forall(_ >= 0) && (p._1 lazyZip mainVars).forall((a, b) => a <= maxVals(b))) // all main vals must be non-negative, but at most their max + .map(freeVals => (sol.evaluate(freeVals.map(_.toLong)), freeVals)) + .filter(p => p._1.forall(_ >= 0) && (p._1 lazyZip sol.dependentVars).forall((a, b) => a <= maxVals(b))) // all main vals must be non-negative, but at most their max .map((s1, s2) => s1.sum + s2.sum) .min diff --git a/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala b/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala new file mode 100644 index 00000000..b7c71098 --- /dev/null +++ b/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala @@ -0,0 +1,108 @@ +package eu.sim642.adventofcodelib + +import scala.collection.mutable +import scala.math.Integral.Implicits.infixIntegralOps +import scala.math.Ordering.Implicits.infixOrderingOps +import scala.reflect.ClassTag + +object GaussianElimination { + + case class Solution[A: Integral](dependentVars: Seq[Int], dependentGenerator: Seq[A], + freeVars: Seq[Int], freeGenerators: Seq[Seq[A]], + const: Seq[A]) { + def evaluate(freeVals: Seq[A]): Seq[A] = { + (dependentGenerator lazyZip const).zipWithIndex.map({case ((mainVar, v), i) => + val r = v - (freeGenerators lazyZip freeVals).map((freeVar, freeVal) => freeVar(i) * freeVal).sum + if (r % mainVar == 0) + r / mainVar + else + -summon[Integral[A]].one // TODO: Option + }).toList + } + } + + def solve[A: ClassTag](initialA: Seq[Seq[A]], initialb: Seq[A])(using aIntegral: Integral[A]): Solution[A] = { + val rows = initialA zip initialb // TODO: lazyZip + val m: mutable.ArraySeq[mutable.ArraySeq[A]] = rows.map((a, b) => (a :+ b).to(mutable.ArraySeq)).to(mutable.ArraySeq) + val n = initialA.head.size + + def swapRows(y1: Int, y2: Int): Unit = { + val row1 = m(y1) + m(y1) = m(y2) + m(y2) = row1 + } + + def multiplyRow(y: Int, factor: A): Unit = { + for (x2 <- 0 until (n + 1)) + m(y)(x2) *= factor + } + + def simplifyRow(y: Int): Unit = { + val factor = NumberTheory.gcd(m(y).toSeq) // TODO: avoid conversion + if (factor.abs > summon[Integral[A]].one) { + for (x2 <- 0 until (n + 1)) + m(y)(x2) /= factor + } + } + + def reduceDown(x: Int, y1: Int, y2: Int): Unit = { + val c2 = m(y2)(x) + if (c2 != 0) { + val c1 = m(y1)(x) + val (_, _, (factor, factor2)) = NumberTheory.extendedGcd(c1, c2) + for (x2 <- 0 until x) // must start from 0 because we're now multiplying entire row y2 + m(y2)(x2) = factor2 * m(y2)(x2) + for (x2 <- x until (n + 1)) + m(y2)(x2) = factor2 * m(y2)(x2) + factor * m(y1)(x2) + //simplifyRow(y2) // TODO: helps? + } + } + + var y = 0 + for (x <- 0 until n) { + val y2opt = m.indices.find(y2 => y2 >= y && m(y2)(x) != 0) + y2opt match { + case None => // move to next x + case Some(y2) => + swapRows(y, y2) + for (y3 <- (y + 1) until m.size) + reduceDown(x, y, y3) + + y += 1 + } + } + + // check consistency + for (y2 <- y until m.size) + assert(m(y2).last == 0) // TODO: return Option + + val mainVars = mutable.ArrayBuffer.empty[Int] + val freeVars = mutable.ArrayBuffer.empty[Int] + y = 0 + for (x <- 0 until n) { + if (y < m.size) { // TODO: break if y too big + if (m(y)(x) == 0) { + freeVars += x + () + } // move to next x + else { + mainVars += x + for (y3 <- 0 until y) + reduceDown(x, y, y3) + + y += 1 + } + } + else + freeVars += x // can't break if this is here + } + + Solution( + dependentVars = mainVars.toSeq, + dependentGenerator = (mainVars lazyZip m).view.map((v, row) => row(v)).toSeq, + freeVars = freeVars.toSeq, + freeGenerators = freeVars.view.map(x => m.view.map(_(x)).toSeq).toSeq, + const = m.view.map(_.last).toSeq + ) + } +} From 0fc96601c9a13c895a3a67e9af7d6d27f070c993 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 14 Dec 2025 22:09:46 +0200 Subject: [PATCH 92/99] Simplify gaussian elimination solution in 2025 day 10 part 2 --- .../eu/sim642/adventofcode2025/Day10.scala | 45 +++++++------------ 1 file changed, 17 insertions(+), 28 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala index c25fd351..9e826363 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -120,41 +120,30 @@ object Day10 { val zeroCol = machine.joltages.map(_ => 0L) val rows = machine.buttons - .map(button => - button.foldLeft(zeroCol)((acc, i) => acc.updated(i, 1L)) - ) + .map(_.foldLeft(zeroCol)(_.updated(_, 1L))) .transpose val sol = GaussianElimination.solve(rows, machine.joltages.map(_.toLong)) - //val mSum = m.transpose.map(_.sum) // TODO: use? - val maxVals = machine.buttons.map(_.map(machine.joltages(_)).min) - - def helper0(sum: Int, maxs: List[Int]): Iterator[List[Int]] = { - maxs match { - case Nil => Iterator(Nil) - case List(m) if sum <= m => Iterator(List(sum)) - case List(m) => Iterator.empty - case m :: newMaxs => - for { - x <- (0 to (m min sum)).iterator - rest <- helper0(sum - x, newMaxs) - } yield x :: rest - } + def helper(freeMaxs: List[Int]): Iterator[List[Int]] = freeMaxs match { // TODO: this seems like it should exist from earlier somewhere + case Nil => Iterator(Nil) + case freeMax :: newFreeMaxs => + for { + freeVal <- (0 to freeMax).iterator + newFreeVals <- helper(newFreeMaxs) + } yield freeVal :: newFreeVals } - val bound = sol.freeVars.map(maxVals).sum - val choices = (0 to bound).iterator.flatMap(helper0(_, sol.freeVars.map(maxVals).toList)) - - val answer = - choices - .map(freeVals => (sol.evaluate(freeVals.map(_.toLong)), freeVals)) - .filter(p => p._1.forall(_ >= 0) && (p._1 lazyZip sol.dependentVars).forall((a, b) => a <= maxVals(b))) // all main vals must be non-negative, but at most their max - .map((s1, s2) => s1.sum + s2.sum) - .min - - answer.toInt + val maxs = machine.buttons.map(_.map(machine.joltages).min) + val freeMaxs = sol.freeVars.map(maxs) + val dependentMaxs = sol.dependentVars.map(maxs) + (for { + freeVals <- helper(freeMaxs.toList) + dependentVals = sol.evaluate(freeVals.map(_.toLong)) + if dependentVals.forall(_ >= 0) + if (dependentVals lazyZip dependentMaxs).forall(_ <= _) + } yield dependentVals.sum.toInt + freeVals.sum).min } } From d0ad64c53811ef23d131a3f29b48f1e1d5ec3454 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 14 Dec 2025 22:13:09 +0200 Subject: [PATCH 93/99] Use Int in gaussian elimination solution in 2025 day 10 part 2 --- src/main/scala/eu/sim642/adventofcode2025/Day10.scala | 10 +++++----- 1 file changed, 5 insertions(+), 5 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala index 9e826363..4ff46651 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -117,13 +117,13 @@ object Day10 { */ override def fewestPresses(machine: Machine): Int = { - val zeroCol = machine.joltages.map(_ => 0L) + val zeroCol = machine.joltages.map(_ => 0) val rows = machine.buttons - .map(_.foldLeft(zeroCol)(_.updated(_, 1L))) + .map(_.foldLeft(zeroCol)(_.updated(_, 1))) .transpose - val sol = GaussianElimination.solve(rows, machine.joltages.map(_.toLong)) + val sol = GaussianElimination.solve(rows, machine.joltages) //val mSum = m.transpose.map(_.sum) // TODO: use? def helper(freeMaxs: List[Int]): Iterator[List[Int]] = freeMaxs match { // TODO: this seems like it should exist from earlier somewhere @@ -140,10 +140,10 @@ object Day10 { val dependentMaxs = sol.dependentVars.map(maxs) (for { freeVals <- helper(freeMaxs.toList) - dependentVals = sol.evaluate(freeVals.map(_.toLong)) + dependentVals = sol.evaluate(freeVals) if dependentVals.forall(_ >= 0) if (dependentVals lazyZip dependentMaxs).forall(_ <= _) - } yield dependentVals.sum.toInt + freeVals.sum).min + } yield dependentVals.sum + freeVals.sum).min } } From 27633100be56a4b93b1b97d13f306b001def1a9c Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Sun, 14 Dec 2025 22:35:39 +0200 Subject: [PATCH 94/99] Optimize gaussian elimination solution evaluation --- .../adventofcodelib/GaussianElimination.scala | 20 ++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala b/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala index b7c71098..cb6165a5 100644 --- a/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala +++ b/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala @@ -10,14 +10,24 @@ object GaussianElimination { case class Solution[A: Integral](dependentVars: Seq[Int], dependentGenerator: Seq[A], freeVars: Seq[Int], freeGenerators: Seq[Seq[A]], const: Seq[A]) { + private lazy val freeGeneratorsTransposed = { // transpose of empty generators needs right length for lazyZip to work below + if (freeGenerators.isEmpty) + const.map(_ => Nil) + else + freeGenerators.transpose + } + + require(dependentGenerator.size == const.size) + require(dependentGenerator.size == freeGeneratorsTransposed.size) + def evaluate(freeVals: Seq[A]): Seq[A] = { - (dependentGenerator lazyZip const).zipWithIndex.map({case ((mainVar, v), i) => - val r = v - (freeGenerators lazyZip freeVals).map((freeVar, freeVal) => freeVar(i) * freeVal).sum + (const lazyZip freeGeneratorsTransposed lazyZip dependentGenerator).map((v, fgt, mainVar) => { + val r = v - (fgt lazyZip freeVals).map(_ * _).sum if (r % mainVar == 0) r / mainVar else -summon[Integral[A]].one // TODO: Option - }).toList + }) } } @@ -101,8 +111,8 @@ object GaussianElimination { dependentVars = mainVars.toSeq, dependentGenerator = (mainVars lazyZip m).view.map((v, row) => row(v)).toSeq, freeVars = freeVars.toSeq, - freeGenerators = freeVars.view.map(x => m.view.map(_(x)).toSeq).toSeq, - const = m.view.map(_.last).toSeq + freeGenerators = freeVars.view.map(x => m.view.take(mainVars.size).map(_(x)).toSeq).toSeq, + const = m.view.take(mainVars.size).map(_.last).toSeq ) } } From a1c7281e12cddeff747e332a53e33621c434eb60 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 15 Dec 2025 20:25:16 +0200 Subject: [PATCH 95/99] Clean up GaussianElimination --- .../adventofcodelib/GaussianElimination.scala | 54 ++++++++----------- 1 file changed, 21 insertions(+), 33 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala b/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala index cb6165a5..30405c3e 100644 --- a/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala +++ b/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala @@ -42,42 +42,36 @@ object GaussianElimination { m(y2) = row1 } - def multiplyRow(y: Int, factor: A): Unit = { - for (x2 <- 0 until (n + 1)) - m(y)(x2) *= factor - } - def simplifyRow(y: Int): Unit = { val factor = NumberTheory.gcd(m(y).toSeq) // TODO: avoid conversion if (factor.abs > summon[Integral[A]].one) { - for (x2 <- 0 until (n + 1)) - m(y)(x2) /= factor + for (x <- 0 until (n + 1)) + m(y)(x) /= factor } } - def reduceDown(x: Int, y1: Int, y2: Int): Unit = { + def reduceRow(x: Int, y1: Int, y2: Int): Unit = { val c2 = m(y2)(x) if (c2 != 0) { val c1 = m(y1)(x) - val (_, _, (factor, factor2)) = NumberTheory.extendedGcd(c1, c2) + val (factor1, factor2) = NumberTheory.extendedGcd(c1, c2)._3 for (x2 <- 0 until x) // must start from 0 because we're now multiplying entire row y2 m(y2)(x2) = factor2 * m(y2)(x2) for (x2 <- x until (n + 1)) - m(y2)(x2) = factor2 * m(y2)(x2) + factor * m(y1)(x2) + m(y2)(x2) = factor2 * m(y2)(x2) + factor1 * m(y1)(x2) //simplifyRow(y2) // TODO: helps? } } + // forward elimination var y = 0 for (x <- 0 until n) { - val y2opt = m.indices.find(y2 => y2 >= y && m(y2)(x) != 0) - y2opt match { + (y until m.size).find(m(_)(x) != 0) match { case None => // move to next x case Some(y2) => swapRows(y, y2) for (y3 <- (y + 1) until m.size) - reduceDown(x, y, y3) - + reduceRow(x, y, y3) y += 1 } } @@ -86,33 +80,27 @@ object GaussianElimination { for (y2 <- y until m.size) assert(m(y2).last == 0) // TODO: return Option - val mainVars = mutable.ArrayBuffer.empty[Int] + // backward elimination + val dependentVars = mutable.ArrayBuffer.empty[Int] val freeVars = mutable.ArrayBuffer.empty[Int] y = 0 for (x <- 0 until n) { - if (y < m.size) { // TODO: break if y too big - if (m(y)(x) == 0) { - freeVars += x - () - } // move to next x - else { - mainVars += x - for (y3 <- 0 until y) - reduceDown(x, y, y3) - - y += 1 - } + if (y >= m.size || m(y)(x) == 0) + freeVars += x + else { + dependentVars += x + for (y2 <- 0 until y) + reduceRow(x, y, y2) + y += 1 } - else - freeVars += x // can't break if this is here } Solution( - dependentVars = mainVars.toSeq, - dependentGenerator = (mainVars lazyZip m).view.map((v, row) => row(v)).toSeq, + dependentVars = dependentVars.toSeq, + dependentGenerator = (dependentVars lazyZip m).view.map((v, row) => row(v)).toSeq, freeVars = freeVars.toSeq, - freeGenerators = freeVars.view.map(x => m.view.take(mainVars.size).map(_(x)).toSeq).toSeq, - const = m.view.take(mainVars.size).map(_.last).toSeq + freeGenerators = freeVars.view.map(x => m.view.take(dependentVars.size).map(_(x)).toSeq).toSeq, + const = m.view.take(dependentVars.size).map(_.last).toSeq ) } } From 2af0082248764b951ef92f124788d1bbe9ff4122 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 15 Dec 2025 20:47:47 +0200 Subject: [PATCH 96/99] Clean up GaussianElimination more --- .../adventofcodelib/GaussianElimination.scala | 50 +++++++++++-------- 1 file changed, 29 insertions(+), 21 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala b/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala index 30405c3e..1f3c8d93 100644 --- a/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala +++ b/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala @@ -32,33 +32,40 @@ object GaussianElimination { } def solve[A: ClassTag](initialA: Seq[Seq[A]], initialb: Seq[A])(using aIntegral: Integral[A]): Solution[A] = { - val rows = initialA zip initialb // TODO: lazyZip - val m: mutable.ArraySeq[mutable.ArraySeq[A]] = rows.map((a, b) => (a :+ b).to(mutable.ArraySeq)).to(mutable.ArraySeq) + val m = initialA.size val n = initialA.head.size + require(initialb.sizeIs == m) + + val A: mutable.ArraySeq[mutable.ArraySeq[A]] = initialA.map(_.to(mutable.ArraySeq)).to(mutable.ArraySeq) + val b: mutable.ArraySeq[A] = initialb.to(mutable.ArraySeq) def swapRows(y1: Int, y2: Int): Unit = { - val row1 = m(y1) - m(y1) = m(y2) - m(y2) = row1 + val A1 = A(y1) + A(y1) = A(y2) + A(y2) = A1 + val b1 = b(y1) + b(y1) = b(y2) + b(y2) = b1 } def simplifyRow(y: Int): Unit = { - val factor = NumberTheory.gcd(m(y).toSeq) // TODO: avoid conversion + val factor = NumberTheory.gcd(NumberTheory.gcd(A(y).toSeq), b(y)) // TODO: avoid conversion if (factor.abs > summon[Integral[A]].one) { - for (x <- 0 until (n + 1)) - m(y)(x) /= factor + A(y).mapInPlace(_ / factor) + b(y) /= factor } } def reduceRow(x: Int, y1: Int, y2: Int): Unit = { - val c2 = m(y2)(x) + val c2 = A(y2)(x) if (c2 != 0) { - val c1 = m(y1)(x) + val c1 = A(y1)(x) val (factor1, factor2) = NumberTheory.extendedGcd(c1, c2)._3 for (x2 <- 0 until x) // must start from 0 because we're now multiplying entire row y2 - m(y2)(x2) = factor2 * m(y2)(x2) - for (x2 <- x until (n + 1)) - m(y2)(x2) = factor2 * m(y2)(x2) + factor1 * m(y1)(x2) + A(y2)(x2) = factor2 * A(y2)(x2) + for (x2 <- x until n) + A(y2)(x2) = factor2 * A(y2)(x2) + factor1 * A(y1)(x2) + b(y2) = factor2 * b(y2) + factor1 * b(y1) //simplifyRow(y2) // TODO: helps? } } @@ -66,26 +73,26 @@ object GaussianElimination { // forward elimination var y = 0 for (x <- 0 until n) { - (y until m.size).find(m(_)(x) != 0) match { + (y until m).find(A(_)(x) != 0) match { case None => // move to next x case Some(y2) => swapRows(y, y2) - for (y3 <- (y + 1) until m.size) + for (y3 <- (y + 1) until m) reduceRow(x, y, y3) y += 1 } } // check consistency - for (y2 <- y until m.size) - assert(m(y2).last == 0) // TODO: return Option + for (y2 <- y until b.size) + assert(b(y2) == 0) // TODO: return Option // backward elimination val dependentVars = mutable.ArrayBuffer.empty[Int] val freeVars = mutable.ArrayBuffer.empty[Int] y = 0 for (x <- 0 until n) { - if (y >= m.size || m(y)(x) == 0) + if (y >= m || A(y)(x) == 0) freeVars += x else { dependentVars += x @@ -95,12 +102,13 @@ object GaussianElimination { } } + val Aview = A.view.take(dependentVars.size) Solution( dependentVars = dependentVars.toSeq, - dependentGenerator = (dependentVars lazyZip m).view.map((v, row) => row(v)).toSeq, + dependentGenerator = (A lazyZip dependentVars).map(_(_)).toSeq, freeVars = freeVars.toSeq, - freeGenerators = freeVars.view.map(x => m.view.take(dependentVars.size).map(_(x)).toSeq).toSeq, - const = m.view.take(dependentVars.size).map(_.last).toSeq + freeGenerators = freeVars.view.map(x => Aview.map(_(x)).toSeq).toSeq, + const = b.view.take(dependentVars.size).toSeq ) } } From 2af26153d0db9922df4e97d3ba6654e4fbd933af Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 15 Dec 2025 21:03:40 +0200 Subject: [PATCH 97/99] Use Option in GaussianElimination --- .../eu/sim642/adventofcode2025/Day10.scala | 4 +- .../adventofcodelib/GaussianElimination.scala | 82 +++++++++++-------- 2 files changed, 48 insertions(+), 38 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala index 4ff46651..dbeaa524 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -123,7 +123,7 @@ object Day10 { .map(_.foldLeft(zeroCol)(_.updated(_, 1))) .transpose - val sol = GaussianElimination.solve(rows, machine.joltages) + val sol = GaussianElimination.solve(rows, machine.joltages).get //val mSum = m.transpose.map(_.sum) // TODO: use? def helper(freeMaxs: List[Int]): Iterator[List[Int]] = freeMaxs match { // TODO: this seems like it should exist from earlier somewhere @@ -140,7 +140,7 @@ object Day10 { val dependentMaxs = sol.dependentVars.map(maxs) (for { freeVals <- helper(freeMaxs.toList) - dependentVals = sol.evaluate(freeVals) + dependentVals <- sol.evaluate(freeVals) if dependentVals.forall(_ >= 0) if (dependentVals lazyZip dependentMaxs).forall(_ <= _) } yield dependentVals.sum + freeVals.sum).min diff --git a/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala b/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala index 1f3c8d93..966397bb 100644 --- a/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala +++ b/src/main/scala/eu/sim642/adventofcodelib/GaussianElimination.scala @@ -1,37 +1,43 @@ package eu.sim642.adventofcodelib +import eu.sim642.adventofcodelib.IntegralImplicits.ExtraDivModIntegralOps + import scala.collection.mutable import scala.math.Integral.Implicits.infixIntegralOps import scala.math.Ordering.Implicits.infixOrderingOps import scala.reflect.ClassTag +import scala.util.boundary +import scala.util.boundary.break +/** + * Integer-only Gaussian elimination. + */ object GaussianElimination { case class Solution[A: Integral](dependentVars: Seq[Int], dependentGenerator: Seq[A], freeVars: Seq[Int], freeGenerators: Seq[Seq[A]], - const: Seq[A]) { + constGenerator: Seq[A]) { private lazy val freeGeneratorsTransposed = { // transpose of empty generators needs right length for lazyZip to work below if (freeGenerators.isEmpty) - const.map(_ => Nil) + constGenerator.map(_ => Nil) else freeGenerators.transpose } - require(dependentGenerator.size == const.size) + require(dependentGenerator.size == constGenerator.size) require(dependentGenerator.size == freeGeneratorsTransposed.size) - def evaluate(freeVals: Seq[A]): Seq[A] = { - (const lazyZip freeGeneratorsTransposed lazyZip dependentGenerator).map((v, fgt, mainVar) => { - val r = v - (fgt lazyZip freeVals).map(_ * _).sum - if (r % mainVar == 0) - r / mainVar - else - -summon[Integral[A]].one // TODO: Option - }) + def evaluate(freeVals: Seq[A]): Option[Seq[A]] = { + boundary { // poor man's sequence + Some((constGenerator lazyZip freeGeneratorsTransposed lazyZip dependentGenerator).map((const, freeCoeffs, dependentCoeff) => { + val r = const - (freeCoeffs lazyZip freeVals).map(_ * _).sum + (r /! dependentCoeff).getOrElse(break(None)) + })) + } } } - def solve[A: ClassTag](initialA: Seq[Seq[A]], initialb: Seq[A])(using aIntegral: Integral[A]): Solution[A] = { + def solve[A: ClassTag](initialA: Seq[Seq[A]], initialb: Seq[A])(using aIntegral: Integral[A]): Option[Solution[A]] = { val m = initialA.size val n = initialA.head.size require(initialb.sizeIs == m) @@ -83,32 +89,36 @@ object GaussianElimination { } } - // check consistency - for (y2 <- y until b.size) - assert(b(y2) == 0) // TODO: return Option + boundary { + // check consistency + for (y2 <- y until b.size) { + if (b(y2) != 0) + break(None) + } - // backward elimination - val dependentVars = mutable.ArrayBuffer.empty[Int] - val freeVars = mutable.ArrayBuffer.empty[Int] - y = 0 - for (x <- 0 until n) { - if (y >= m || A(y)(x) == 0) - freeVars += x - else { - dependentVars += x - for (y2 <- 0 until y) - reduceRow(x, y, y2) - y += 1 + // backward elimination + val dependentVars = mutable.ArrayBuffer.empty[Int] + val freeVars = mutable.ArrayBuffer.empty[Int] + y = 0 + for (x <- 0 until n) { + if (y >= m || A(y)(x) == 0) + freeVars += x + else { + dependentVars += x + for (y2 <- 0 until y) + reduceRow(x, y, y2) + y += 1 + } } - } - val Aview = A.view.take(dependentVars.size) - Solution( - dependentVars = dependentVars.toSeq, - dependentGenerator = (A lazyZip dependentVars).map(_(_)).toSeq, - freeVars = freeVars.toSeq, - freeGenerators = freeVars.view.map(x => Aview.map(_(x)).toSeq).toSeq, - const = b.view.take(dependentVars.size).toSeq - ) + val Aview = A.view.take(dependentVars.size) + Some(Solution( + dependentVars = dependentVars.toSeq, + dependentGenerator = (A lazyZip dependentVars).map(_(_)).toSeq, + freeVars = freeVars.toSeq, + freeGenerators = freeVars.view.map(x => Aview.map(_(x)).toSeq).toSeq, + constGenerator = b.view.take(dependentVars.size).toSeq + )) + } } } From 83b556ac5cd4de510a0ee3577edf0c051a8c5437 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 15 Dec 2025 21:07:33 +0200 Subject: [PATCH 98/99] Integrate Gaussian elimination solution in 2025 day 10 part 2 --- src/main/scala/eu/sim642/adventofcode2025/Day10.scala | 5 ++++- src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala | 2 +- 2 files changed, 5 insertions(+), 2 deletions(-) diff --git a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala index dbeaa524..60b6440f 100644 --- a/src/main/scala/eu/sim642/adventofcode2025/Day10.scala +++ b/src/main/scala/eu/sim642/adventofcode2025/Day10.scala @@ -87,6 +87,9 @@ object Day10 { } } + /** + * Solution, which performs Gaussian elimination and then brute forces free variables in their ranges. + */ object GaussianEliminationPart2Solution extends Part2Solution { /* x0 x1 x2 x3 x4 x5 @@ -161,6 +164,6 @@ object Day10 { def main(args: Array[String]): Unit = { println(Part1.sumFewestPresses(parseMachines(input))) - println(Z3Part2Solution.sumFewestPresses(parseMachines(input))) + println(GaussianEliminationPart2Solution.sumFewestPresses(parseMachines(input))) } } diff --git a/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala index fb1966e1..2e36de76 100644 --- a/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala +++ b/src/test/scala/eu/sim642/adventofcode2025/Day10Test.scala @@ -8,7 +8,7 @@ import org.scalatest.funsuite.AnyFunSuite class Day10Test extends Suites( new Part1Test, new NaivePart2SolutionTest, - //new Z3Part2SolutionTest, + new Z3Part2SolutionTest, new GaussianEliminationPart2SolutionTest, ) From 06b56b6b35b6b22be386f6222cb320126f270938 Mon Sep 17 00:00:00 2001 From: Simmo Saan Date: Mon, 15 Dec 2025 21:10:34 +0200 Subject: [PATCH 99/99] Remove inputs links from README --- README.md | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) diff --git a/README.md b/README.md index 4f1d4300..b82cda09 100644 --- a/README.md +++ b/README.md @@ -2,16 +2,16 @@ [![Scala CI](https://github.com/sim642/adventofcode/workflows/Scala%20CI/badge.svg?branch=master)](https://github.com/sim642/adventofcode/actions?query=workflow%3A%22Scala+CI%22) -| Year | Solutions | Inputs | Tests | -| ---- | --------- | ------ | ----- | -| 2015 | [Solutions](src/main/scala/eu/sim642/adventofcode2015) | [My inputs](src/main/resources/eu/sim642/adventofcode2015) | [Tests](src/test/scala/eu/sim642/adventofcode2015) | -| 2016 | [Solutions](src/main/scala/eu/sim642/adventofcode2016) | [My inputs](src/main/resources/eu/sim642/adventofcode2016) | [Tests](src/test/scala/eu/sim642/adventofcode2016) | -| 2017 | [Solutions](src/main/scala/eu/sim642/adventofcode2017) | [My inputs](src/main/resources/eu/sim642/adventofcode2017) | [Tests](src/test/scala/eu/sim642/adventofcode2017) | -| 2018 | [Solutions](src/main/scala/eu/sim642/adventofcode2018) | [My inputs](src/main/resources/eu/sim642/adventofcode2018), [other inputs](src/test/resources/eu/sim642/adventofcode2018) | [Tests](src/test/scala/eu/sim642/adventofcode2018) | -| 2019 | [Solutions](src/main/scala/eu/sim642/adventofcode2019) | [My inputs](src/main/resources/eu/sim642/adventofcode2019) | [Tests](src/test/scala/eu/sim642/adventofcode2019) | -| 2020 | [Solutions](src/main/scala/eu/sim642/adventofcode2020) | [My inputs](src/main/resources/eu/sim642/adventofcode2020), [other inputs](src/test/resources/eu/sim642/adventofcode2020) | [Tests](src/test/scala/eu/sim642/adventofcode2020) | -| 2021 | [Solutions](src/main/scala/eu/sim642/adventofcode2021) | [My inputs](src/main/resources/eu/sim642/adventofcode2021), [other inputs](src/test/resources/eu/sim642/adventofcode2021) | [Tests](src/test/scala/eu/sim642/adventofcode2021) | -| 2022 | [Solutions](src/main/scala/eu/sim642/adventofcode2022) | [My inputs](src/main/resources/eu/sim642/adventofcode2022) | [Tests](src/test/scala/eu/sim642/adventofcode2022) | -| 2023 | [Solutions](src/main/scala/eu/sim642/adventofcode2023) | [My inputs](src/main/resources/eu/sim642/adventofcode2023) | [Tests](src/test/scala/eu/sim642/adventofcode2023) | -| 2024 | [Solutions](src/main/scala/eu/sim642/adventofcode2024) | [My inputs](src/main/resources/eu/sim642/adventofcode2024) | [Tests](src/test/scala/eu/sim642/adventofcode2024) | -| 2025 | [Solutions](src/main/scala/eu/sim642/adventofcode2025) | [My inputs](src/main/resources/eu/sim642/adventofcode2025) | [Tests](src/test/scala/eu/sim642/adventofcode2025) | +| Year | Solutions | Tests | +| ---- | --------- | ----- | +| 2015 | [Solutions](src/main/scala/eu/sim642/adventofcode2015) | [Tests](src/test/scala/eu/sim642/adventofcode2015) | +| 2016 | [Solutions](src/main/scala/eu/sim642/adventofcode2016) | [Tests](src/test/scala/eu/sim642/adventofcode2016) | +| 2017 | [Solutions](src/main/scala/eu/sim642/adventofcode2017) | [Tests](src/test/scala/eu/sim642/adventofcode2017) | +| 2018 | [Solutions](src/main/scala/eu/sim642/adventofcode2018) | [Tests](src/test/scala/eu/sim642/adventofcode2018) | +| 2019 | [Solutions](src/main/scala/eu/sim642/adventofcode2019) | [Tests](src/test/scala/eu/sim642/adventofcode2019) | +| 2020 | [Solutions](src/main/scala/eu/sim642/adventofcode2020) | [Tests](src/test/scala/eu/sim642/adventofcode2020) | +| 2021 | [Solutions](src/main/scala/eu/sim642/adventofcode2021) | [Tests](src/test/scala/eu/sim642/adventofcode2021) | +| 2022 | [Solutions](src/main/scala/eu/sim642/adventofcode2022) | [Tests](src/test/scala/eu/sim642/adventofcode2022) | +| 2023 | [Solutions](src/main/scala/eu/sim642/adventofcode2023) | [Tests](src/test/scala/eu/sim642/adventofcode2023) | +| 2024 | [Solutions](src/main/scala/eu/sim642/adventofcode2024) | [Tests](src/test/scala/eu/sim642/adventofcode2024) | +| 2025 | [Solutions](src/main/scala/eu/sim642/adventofcode2025) | [Tests](src/test/scala/eu/sim642/adventofcode2025) |