Monistus

#include <bits/stdc++.h>
using namespace std;
 
string dup(string s, int d) {
    string ans = "";
    for (int i = 0; i < d; ++i) {
        if (!isdigit(s[i])) {
            ans += s[i];
        }
        else {
            string another = "";
            int d2 = s[i]-'0', d2_c = d2;
            for (int j = i+1; j < d; ++j) {
                another += s[j];
                --d2_c;
            }
            for (int j = 0; j < d2_c; ++j)
                another += ans[j];
            ans += dup(another,d2);
        }
    }
    return ans;
}
 
int main() {
    string s, ans = "";
    cin >> s;
    cout << dup(s,(int)s.size());
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 1, 2

Verdict: WRONG ANSWER

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: WRONG ANSWER

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 10

Group: 2

Verdict: TIME LIMIT EXCEEDED

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