Monistus

input/code.cpp: In function 'int main()':
input/code.cpp:19:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |     while (i < s.size()) {
      |            ~~^~~~~~~~~~

#include <iostream>
#include <vector>
#include <utility>
#include <algorithm>
#include <limits.h>

using namespace std;

typedef long long ll;

int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);

    string s;
    cin >> s;

    int i = 0;
    while (i < s.size()) {
        int c = s[i] - '0';

        if (c > 0 && c < 10) {
            string ss = s.substr(i + 1, c);
            s.erase(i, 1);
            s = s.insert(i, ss);
            i--;
        }

        //cout << s << endl;

        i++;
    }

    cout << s << endl;
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 1, 2

Verdict: ACCEPTED

Test 4

Group: 1, 2

Verdict: ACCEPTED

Test 5

Group: 1, 2

Verdict: ACCEPTED

Test 6

Group: 1, 2

Verdict: ACCEPTED

Test 7

Group: 1, 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 2

Verdict: TIME LIMIT EXCEEDED