Package g0001_0100.s0093_restore_ip_addresses

Class Solution

  • All Implemented Interfaces:
    
public final class Solution

    93 - Restore IP Addresses.

    Medium

    A valid IP address consists of exactly four integers separated by single dots. Each integer is between 0 and 255 ( inclusive ) and cannot have leading zeros.

    • For example, "0.1.2.201" and "192.168.1.1" are valid IP addresses, but "0.011.255.245", "192.168.1.312" and "[email protected]" are invalid IP addresses.

    Given a string s containing only digits, return all possible valid IP addresses that can be formed by inserting dots into s. You are not allowed to reorder or remove any digits in s. You may return the valid IP addresses in any order.

    Example 1:

    Input: s = "25525511135"

    Output: "255.255.11.135","255.255.111.35"

    Example 2:

    Input: s = "0000"

    Output: "0.0.0.0"

    Example 3:

    Input: s = "101023"

    Output: "1.0.10.23","1.0.102.3","10.1.0.23","10.10.2.3","101.0.2.3"

    Constraints:

    • 1 <= s.length <= 20

    • s consists of digits only.

    • 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