100-days-of-rust/Week-02/Day-11_Restore-IP-Addresses/README.md
2023-03-23 20:52:21 -04:00

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## Restore IP Addresses
Given a string s containing only digits, return all possible valid IP addresses that can be obtained from s. You can return them in **any** order.
A **valid IP address** consists of exactly four integers, each integer is between 0 and 255, separated by single dots and cannot have leading zeros. For example, "0.1.2.201" and "192.168.1.1" are **valid** IP addresses and "0.011.255.245", "192.168.1.312" and "192.168@1.1" are **invalid** IP addresses.
### Examples
**Example 1:**
```text
Input: s = "25525511135"
Output: ["255.255.11.135","255.255.111.35"]
```
**Example 2:**
```text
Input: s = "0000"
Output: ["0.0.0.0"]
```
**Example 3:**
```text
Input: s = "1111"
Output: ["1.1.1.1"]
```
**Example 4:**
```text
Input: s = "010010"
Output: ["0.10.0.10","0.100.1.0"]
```
**Example 5:**
```text
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`
- `s consists of digits only.`
- `Ipv4 format only.`
---
### Notes
- `All digits in string s MUST be used to obtain each valid IP`