Pakkaus

#include <iostream>
#include <sstream>

using namespace std;

int main() {
	string input;
    
    cin >> input;
    
    unsigned int kerroin = 0;
	string kerrattava = "";
	
	std::ostringstream os;
		
	for (unsigned int i=0; i<input.length(); i++) {
			
		if (input[i] >= '0' && input[i] <= '9') {
				
			if (kerrattava != "") {
				while (kerroin > 0) {
					os << kerrattava;
					kerroin--;
				}
				kerrattava = "";
				kerroin = input[i]-'0';
			} else {
				kerroin = kerroin*10 + (input[i]-'0');
			}
		} else {
			kerrattava += input[i];
		}
	}
		
	while (kerroin > 0) {
		os << kerrattava;
		kerroin--;
	}
    
    cout << os.str() << endl;
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED