Monistus

#include <iostream>
#include <string>
int main() {
    std::string input;
    std::cin >> input;

    int i = input.length();

    while (i >= 0) {
        char c = input[i];

        if (c >= '1' && c <= '9') {
            std::string new_string = "";

            int n = int(c) - 48;

            new_string.append(input.substr(0, i));
            new_string.append(input.substr(i+1, n));
            new_string.append(input.substr(i+1, input.length()-i+1));

            input = new_string;
        } else {
            --i;
        }
    }

    std::cout << input << "\n";

    return 0;
}

Test 1

Group: 1, 2

Verdict: WRONG ANSWER

Test 2

Group: 1, 2

Verdict: ACCEPTED

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: 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