#### Restore IP Addresses from Digits

Given a string of digits, this problem seeks to find all possible valid IP addresses that could be generated from it. IP addresses are typically represented in dot-decimal notation (e.g . "192.168.1.1"), so the goal is to find all possible ways to group the digits in the input string into sets of four that could each correspond to one section of an IP address.

#### Problem

```Given a string containing only digits, restore it by returning all possible valid IP address combinations.
IP addresses are represented in dot-decimal notation, for example: "192.168.1.1".
Example input: "25525511135"
Example output: ["255.255.11.135", "255.255.111.35"]```

#### Solution

This solution is in C++. Our A.I. can create solutions in multiple languages.
by kayakane
```#include <iostream>
#include <string>
#include <vector>

using namespace std;

vector<string> res;
int len = s.size();
for (int i = 1; i < 4 && i < len - 2; i++) {
for (int j = i + 1; j < i + 4 && j < len - 1; j++) {
for (int k = j + 1; k < j + 4 && k < len; k++) {
string s1 = s.substr(0, i), s2 = s.substr(i, j - i), s3 = s.substr(j, k - j), s4 = s.substr(k, len - k);
if (isValid(s1) && isValid(s2) && isValid(s3) && isValid(s4)) {
res.push_back(s1 + "." + s2 + "." + s3 + "." + s4);
} }
}
}
return res;
}

bool isValid(string s) {
if (s.size() > 3 || s.size() == 0 || (s.size() > 1 && s[0] == '0') || stoi(s) > 255) return false;
return true;
}

int main() {
string s = "25525511135";
for (int i = 0; i < res.size(); i++) {
cout << res[i] << endl;
}
return 0;
}```

A.I. Evaluation of the Solution

The candidate's solution is complete and solves the problem. The candidate's approach is to generate all possible IP addresses and check if they are valid.

Evaluated at: 2022-11-27 14:16:06