Package g0001_0100.s0093_restore_ip_addresses

Class Solution

java.lang.Object

g0001_0100.s0093_restore_ip_addresses.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 Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
void	dfs(String s, int segId, int segStart)
List<String>	restoreIpAddresses(String s)

Methods inherited from class java.lang.Object

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

Constructor Details

Solution

public Solution()

Method Details

restoreIpAddresses

public List<String> restoreIpAddresses(String s)

dfs

public void dfs(String s,
 int segId,
 int segStart)