Monistus

input/code.cpp: In function 'int main()':
input/code.cpp:10:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   10 |   for(int i=0; i < lisko.size(); i++){
      |                ~~^~~~~~~~~~~~~~

#include <iostream>
#include <vector>
using namespace std;

int main() {
  string lisko;
  cin >> lisko;
  string copy;

  for(int i=0; i < lisko.size(); i++){
    if (isdigit(lisko[i])) {
      int d;
      d = lisko[i] - '0';
      string substringi = lisko.substr(i+1,d);

      lisko = lisko.substr(0, i) + substringi +substringi + lisko.substr(i+d+1);
      --i;

    }
  }
  cout << lisko;
}

Test 1

Group: 1, 2

Verdict: ACCEPTED

Test 2

Group: 1, 2

Verdict: ACCEPTED

Test 3

Group: 1, 2

Verdict: ACCEPTED

Test 4

Group: 1, 2

Verdict: ACCEPTED

Test 5

Group: 1, 2

Verdict: ACCEPTED

Test 6

Group: 1, 2

Verdict: ACCEPTED

Test 7

Group: 1, 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: TIME LIMIT EXCEEDED

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