LeetCode in Kotlin
468. Validate IP Address
Medium
Given a string queryIP, return "IPv4" if IP is a valid IPv4 address, "IPv6" if IP is a valid IPv6 address or "Neither" if IP is not a correct IP of any type.
A valid IPv4 address is an IP in the form "x1.x2.x3.x4" where 0 <= xi <= 255 and xi cannot contain leading zeros. For example, "192.168.1.1" and "192.168.1.0" are valid IPv4 addresses while "192.168.01.1", "192.168.1.00", and "192.168@1.1" are invalid IPv4 addresses.
A valid IPv6 address is an IP in the form "x1:x2:x3:x4:x5:x6:x7:x8" where:
1 <= xi.length <= 4xiis a hexadecimal string which may contain digits, lowercase English letter ('a'to'f') and upper-case English letters ('A'to'F').- Leading zeros are allowed in
xi.
For example, “2001:0db8:85a3:0000:0000:8a2e:0370:7334" and “2001:db8:85a3:0:0:8A2E:0370:7334" are valid IPv6 addresses, while “2001:0db8:85a3::8A2E:037j:7334" and “02001:0db8:85a3:0000:0000:8a2e:0370:7334" are invalid IPv6 addresses.
Example 1:
Input: queryIP = “172.16.254.1”
Output: “IPv4”
Explanation: This is a valid IPv4 address, return “IPv4”.
Example 2:
Input: queryIP = “2001:0db8:85a3:0:0:8A2E:0370:7334”
Output: “IPv6”
Explanation: This is a valid IPv6 address, return “IPv6”.
Example 3:
Input: queryIP = “256.256.256.256”
Output: “Neither”
Explanation: This is neither a IPv4 address nor a IPv6 address.
Constraints:
queryIPconsists only of English letters, digits and the characters'.'and':'.
Solution
class Solution {
fun validIPAddress(ip: String): String {
if (ip.isEmpty()) {
return NEITHER
}
val arr = ip.split("\\.".toRegex()).toTypedArray()
val arr1 = ip.split(":".toRegex()).toTypedArray()
if (arr.size == 4) {
for (num in arr) {
try {
if (num.length > 1 && num.startsWith("0") || num.toInt() > 255) {
return NEITHER
}
} catch (e: Exception) {
return NEITHER
}
}
return "IPv4"
} else if (arr1.size == 8) {
for (num in arr1) {
if (num.length < 1 || num.length > 4) {
return NEITHER
}
for (j in 0 until num.length) {
val ch = num[j]
if (ch.code > 9 &&
(
Character.isLowerCase(ch) && ch > 'f' ||
Character.isUpperCase(ch) && ch > 'F'
)
) {
return NEITHER
}
}
}
return "IPv6"
}
return NEITHER
}
companion object {
private const val NEITHER = "Neither"
}
}