LeetCode 468: Validate IP Address Solution

Master LeetCode problem 468 (Validate IP Address), a medium challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

468. Validate IP Address

Medium

String

Problem Explanation

Explanation:

To solve this problem, we can follow these steps:

Check if the input IP address is a valid IPv4 address by splitting the string using the dot delimiter and verifying each part.
Check if the input IP address is a valid IPv6 address by splitting the string using the colon delimiter and verifying each part.
Return "IPv4" if the IP address is valid for IPv4, "IPv6" if the IP address is valid for IPv6, and "Neither" if it is not valid for either.

Solution Code

class Solution {
    public String validIPAddress(String IP) {
        if (IP.chars().filter(ch -> ch == '.').count() == 3) {
            return validateIPv4(IP) ? "IPv4" : "Neither";
        }
        if (IP.chars().filter(ch -> ch == ':').count() == 7) {
            return validateIPv6(IP) ? "IPv6" : "Neither";
        }
        return "Neither";
    }

    private boolean validateIPv4(String ip) {
        String[] parts = ip.split("\\.");
        if (parts.length != 4) {
            return false;
        }
        for (String part : parts) {
            if (part.isEmpty() || part.length() > 3 || (part.charAt(0) == '0' && part.length() > 1)) {
                return false;
            }
            for (char ch : part.toCharArray()) {
                if (!Character.isDigit(ch)) {
                    return false;
                }
            }
            int num = Integer.parseInt(part);
            if (num < 0 || num > 255) {
                return false;
            }
        }
        return true;
    }

    private boolean validateIPv6(String ip) {
        String[] parts = ip.split(":");
        if (parts.length != 8) {
            return false;
        }
        for (String part : parts) {
            if (part.isEmpty() || part.length() > 4) {
                return false;
            }
            for (char ch : part.toCharArray()) {
                if (!((ch >= '0' && ch <= '9') || (ch >= 'a' && ch <= 'f') || (ch >= 'A' && ch <= 'F'))) {
                    return false;
                }
            }
        }
        return true;
    }
}

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