Monistus

input/code.cpp: In function 'int main()':
input/code.cpp:14:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   14 |     for (int i = 0; i < input.size(); i++) {
      |                     ~~^~~~~~~~~~~~~~

#include <iostream>
#include <list>

using namespace std;

list<char> l;

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

    auto it = l.begin();
    for (int i = 0; i < input.size(); i++) {
        l.push_back(input[i]);
    }
    l.push_back('*');

    it = l.begin();
    while (*it != '*') {
        if (*it <= '9' && *it >= '1') {
            int c = *it - '0';
            l.insert(next(it, c + 1), next(it, 1), next(it, c + 1));
            auto temp = it;
            it++;
            l.erase(temp);
        }
        else {
            it++;
        }
    }

    for (it = l.begin(); it != prev(l.end()); ++it) {
        cout << *it;
    }
    cout << endl;

    return 0;
}

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: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 2

Verdict: ACCEPTED

Test 12

Group: 2

Verdict: ACCEPTED

Test 13

Group: 2

Verdict: ACCEPTED

Test 14

Group: 2

Verdict: ACCEPTED