Monistus

input/code.cpp: In function 'int main()':
input/code.cpp:23:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::deque<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   23 |                     if(j >= str.size()){
      |                        ~~^~~~~~~~~~~~~

#include <iostream>
#include <string>
#include <deque>
using namespace std;

int main(){
    string s;
    cin >> s;
    deque<deque<char>> ans;
    deque<char> first;
    for(auto c : s)
        first.push_back(c);
    ans.push_back(first);

    while(!ans.empty()){
        auto& str = ans.front();
        while(!str.empty()){
            if(isdigit(str.front())){
                deque<char> multiply;
                int count = str.front() - '0';
                str.pop_front();
                for(auto j = 0; j < count; j++){
                    if(j >= str.size()){
                        multiply.push_back(ans[1][j]);
                    }
                    else
                        multiply.push_back(str[j]);
                }
                ans.push_front(multiply);
                break;
            }
            else{
                cout << str.front();
                str.pop_front();
            }
        }
        if(ans.front().empty()) 
            ans.pop_front();
    }
}

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: WRONG ANSWER

Test 10

Group: 2

Verdict: WRONG ANSWER

Test 11

Group: 2

Verdict: ACCEPTED

Test 12

Group: 2

Verdict: ACCEPTED

Test 13

Group: 2

Verdict: ACCEPTED

Test 14

Group: 2

Verdict: ACCEPTED