Add Boyer moore voting algo (TheAlgorithms#2726)

shraddhavp · web-flow · commit ad380dcaa472 · 2021-10-27T22:03:51.000+03:00
diff --git a/Others/BoyerMoore.java b/Others/BoyerMoore.java
@@ -0,0 +1,40 @@
+/* this Code is the illustration of Boyer moore's voting algorithm to
+find the majority element is an array that appears more than n/2 times in an array
+where "n" is the length of the array.
+For more information on the algorithm refer https://en.wikipedia.org/wiki/Boyer%E2%80%93Moore_majority_vote_algorithm
+ */
+package Others;
+import java.util.*;
+
+public class BoyerMoore {
+    public static int findmajor(int [] a){
+int count=0; int cand=-1;
+for(int i=0;i<a.length;i++){
+    if(count==0){
+        cand=a[i];
+        count=1;
+    }
+    else {
+        if (a[i] == cand)
+            count++;
+        else
+            count--;
+    }
+}for (int i = 0; i < a.length; i++) {
+            if (a[i] == cand)
+                count++;}
+        if (count > (a.length / 2))
+            return cand;
+        return -1;
+}
+    public static void main(String args[]){
+        Scanner input=new Scanner(System.in);
+        int n=input.nextInt();
+        int a[]=new int[n];
+        for(int i=0;i<n;i++){
+            a[i]=input.nextInt();
+        }
+       System.out.println("the majority element is "+findmajor(a));
+
+    }
+}
