Rotations

#include <iostream>
#include <string>
#include <algorithm>
#include <vector>

using namespace std;

int main() {
    long int n;
    cin >> n;
    vector<string> v;
    string x;
    cin >> x;
    for (int i = 0; i < n; i++) {
        string t = x.substr(0, i);
        string t2 = x + t;
        string t3 = t2.substr(i, n);
        v.push_back(t3);
    }

    vector<string>::iterator ans = min_element(v.begin(), v.end());
    cout << v[distance(v.begin(), ans)];
    return 0;
}

Test 1

Verdict: RUNTIME ERROR

Test 2

Verdict: RUNTIME ERROR

Test 3

Verdict: RUNTIME ERROR

Test 4

Verdict: RUNTIME ERROR

Test 5

Verdict: RUNTIME ERROR

Test 6

Verdict: RUNTIME ERROR

Test 7

Verdict: RUNTIME ERROR

Test 8

Verdict: RUNTIME ERROR

Test 9

Verdict: RUNTIME ERROR

Test 10

Verdict: RUNTIME ERROR

Test 11

Verdict: RUNTIME ERROR

Test 12

Verdict: RUNTIME ERROR