Package g0001_0100.s0093_restore_ip_addresses

Class Solution

  • public class Solution
extends Object
    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 = “1111”

    Output: [“1.1.1.1”]

    Example 4:

    Input: s = “010010”

    Output: [“0.10.0.10”,“0.100.1.0”]

    Example 5:

    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:

    • 0 <= s.length <= 20
    • s consists of digits only.

    • Constructor Detail

      • Solution

        public Solution()