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468. Validate IP Address

Given a string IP, 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 but "192.168.01.1", while "192.168.1.00" and "[email protected]" 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 <= 4
  • xi is a hexadecimal string which may contain digits, lower-case 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: IP = "172.16.254.1"
Output: "IPv4"
Explanation: This is a valid IPv4 address, return "IPv4".

Example 2:

Input: IP = "2001:0db8:85a3:0:0:8A2E:0370:7334"
Output: "IPv6"
Explanation: This is a valid IPv6 address, return "IPv6".

Example 3:

Input: IP = "256.256.256.256"
Output: "Neither"
Explanation: This is neither a IPv4 address nor a IPv6 address.

Example 4:

Input: IP = "2001:0db8:85a3:0:0:8A2E:0370:7334:"
Output: "Neither"

Example 5:

Input: IP = "1e1.4.5.6"
Output: "Neither"

Constraints:

  • IP consists only of English letters, digits and the characters '.' and ':'.

Solutions (Rust)

1. Solution

impl Solution {
    pub fn valid_ip_address(ip: String) -> String {
        let ipv4 = ip.split('.').collect::<Vec<_>>();
        let ipv6 = ip.split(':').collect::<Vec<_>>();

        if ipv4.len() == 4 && ipv4.into_iter().all(Self::valid_x_v4) {
            "IPv4"
        } else if ipv6.len() == 8 && ipv6.into_iter().all(Self::valid_x_v6) {
            "IPv6"
        } else {
            "Neither"
        }
        .to_string()
    }

    fn valid_x_v4(x: &str) -> bool {
        x == "0" || (!x.starts_with('0') && x.len() < 4 && x.parse::<i32>().unwrap_or(256) < 256)
    }

    fn valid_x_v6(x: &str) -> bool {
        x.len() > 0 && x.len() < 5 && x.chars().all(|c| c.is_digit(16))
    }
}