Monistus

#include <iostream>
#include <list>

using namespace std;

list<char> l(100005);

int main()
{
    string input;
    cin >> input;

    auto it = l.begin();
    l.insert(it, input.begin(), input.end());


    for (it = l.begin(); it != l.end();) {
        if (*it <= '9' && *it >= '1') {
            int c = *it - '0';
            l.insert(next(it, c + 1), next(it, 1), next(it, c + 1));
            auto temp = it;
            it++;
            l.erase(temp);
        }
        else it++;
    }

    for (it = l.begin(); it != l.end(); ++it) {
        cout << *it;
    }
    cout << endl;

    return 0;
}

Test 1

Group: 1, 2

Verdict: WRONG ANSWER

Test 2

Group: 1, 2

Verdict: WRONG ANSWER

Test 3

Group: 1, 2

Verdict: WRONG ANSWER

Test 4

Group: 1, 2

Verdict: WRONG ANSWER

Test 5

Group: 1, 2

Verdict: WRONG ANSWER

Test 6

Group: 1, 2

Verdict: WRONG ANSWER

Test 7

Group: 1, 2

Verdict: WRONG ANSWER

Test 8

Group: 2

Verdict: WRONG ANSWER

Test 9

Group: 2

Verdict: WRONG ANSWER

Test 10

Group: 2

Verdict: WRONG ANSWER

Test 11

Group: 2

Verdict: WRONG ANSWER

Test 12

Group: 2

Verdict: WRONG ANSWER

Test 13

Group: 2

Verdict: WRONG ANSWER

Test 14

Group: 2

Verdict: WRONG ANSWER