Monistus

#include <iostream>
#include <bits/stdc++.h>


#define all(arr) arr.begin(), arr.end()

using namespace std;
string s;
int curr = 0;

int main() {
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    getline(cin, s);
    int di;
    while (s[curr]) {
        if (s[curr] >= '1' && s[curr] <= '9') {
            di = s[curr] - '0';
            s[curr] = s[curr+1];
            s.insert(curr+1, s, curr+2, di-1);
        } else {
            curr++;
        }
    }
    cout << s << "\n";
    return 0;
}

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: ACCEPTED

Test 12

Group: 2

Verdict: ACCEPTED

Test 13

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 2

Verdict: TIME LIMIT EXCEEDED