Monistus

input/code.cpp: In function 'std::string haku(std::string)':
input/code.cpp:9:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    9 |     for(int i = 0; i < s.size(); i++){
      |                    ~~^~~~~~~~~~
input/code.cpp:19:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   19 |             if(i < s.size()-x){
      |                ~~^~~~~~~~~~~~

#include<bits/stdc++.h>
using namespace std;
using ll = long long;

string haku(string s){

    string u = "";

    for(int i = 0; i < s.size(); i++){

        //if(s.size() >= 10) cout << "käsittele " << s[i] << "\n";

        char c = s[i];
        
        if(isdigit(c)){

            int x = c - '0';

            if(i < s.size()-x){
                //cout << "monista " << haku( s.substr(i + 1, x)) << "\n";
                s.insert(i + 1, haku( s.substr(i + 1, x) ));
            }
            else{
                u += c;
            }

        }
        else{
            u += c;
        }


    }

    return u;

}


int main(){
    ios_base::sync_with_stdio(0); cin.tie(0);
    
    string s;
    cin >> s;

    cout << haku(s);
    
}

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: WRONG ANSWER

Test 10

Group: 2

Verdict: WRONG ANSWER

Test 11

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 2

Verdict: ACCEPTED

Test 14

Group: 2

Verdict: ACCEPTED