Pakkaus

#include <iostream>

using namespace std;

int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  string s, buffer = "";
  long count = 0;
  cin >> s;
  bool last_digit = false;
  for (char c : s) {
    if (c >= '0' && c <= '9') {
      if (!last_digit) {
        for (int i = 0; i < count; ++i) cout << buffer;
        count = 0;
        buffer = "";
      }
      count *= 10;
      count += c-'0';
      last_digit = 1;
    } else {
      buffer.push_back(c);
      last_digit = 0;
    }
  }
  for (int i = 0; i < count; ++i) cout << buffer;
  cout << 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