Package g0401_0500.s0468_validate_ip_address

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    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 <code>"x<sub>1</sub>.x<sub>2</sub>.x<sub>3</sub>.x<sub>4</sub>"</code> where <code>0 <= x<sub>i</sub><= 255</code> and <code>x<sub>i</sub></code> 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 "[email protected]" are invalid IPv4 addresses.

    A valid IPv6 address is an IP in the form <code>"x<sub>1</sub>:x<sub>2</sub>:x<sub>3</sub>:x<sub>4</sub>:x<sub>5</sub>:x<sub>6</sub>:x<sub>7</sub>:x<sub>8</sub>"</code> where:

    • <code>1 <= x<sub>i</sub>.length <= 4</code>

    • <code>x<sub>i</sub></code> is 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 <code>x<sub>i</sub></code>.

    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:

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

    • Nested Class Summary

      Nested Classes 
      Modifier and Type Class Description

    • Field Summary

      Fields 
      Modifier and Type Field Description

    • Constructor Summary

      Constructors 
      Constructor Description
      Solution()

    • Enum Constant Summary

      Enum Constants 
      Enum Constant Description

    • Method Summary

      Modifier and Type Method Description
      final String validIPAddress(String ip)

      • Methods inherited from class java.lang.Object

        clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait