Monistus

#include <bits/stdc++.h>

using namespace std;

string monista(string mj) {
	string result = "";
	for (int i = 0; i < (int)mj.size(); i++) {
		char ch = mj[i];
		if (isdigit(ch)) {
			string newMJ = mj.substr(i+1, ch-'0');
			result = result+monista(newMJ);
		} else {
			string cha(1, ch);
			result = result+cha;
		}
	}
	return result;
}

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

	cout << monista(mj) << endl;
}

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: WRONG ANSWER

Test 6

Group: 1, 2

Verdict: WRONG ANSWER

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