Monistus

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


string Boo(string s)
{
    string offspring = s;

    int loo = 0;
    while (loo < (int)offspring.length())
    {

        if (isdigit(offspring[loo]))
        {
            int cn = offspring[loo] - '0';

            // if (((int)s.length() - loo - 1) < cn) return s;
            // d3oider
            // 0123456
            // len = 7
            // loo = 1
            // cn = 3

            string soo = offspring.substr(loo + 1, cn);
            // soo = Boo(soo);
            // s.replace(loo, cn + 1, soo + soo);
            
            offspring = offspring.substr(0, loo + 1) + soo + soo + offspring.substr(loo + cn + 1, offspring.length());
            offspring.erase(loo, 1);
            // cout << "postpop:" << offspring << endl;



            // mis3si1pi
            // missi1si1pi
            // mississi1pi
            // mississippi
        }
        else
        {
            loo++;
        }
    }


    return offspring;
}



int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);

    string soho;
    cin >> soho;

    string deedee = Boo(soho);


    cout << deedee;

    return 0;
}

// >
// 82silisko
// 2silisko2silisko
// sisilisko2silisko
// sisiliskosisilisko
// sisiliskosisilisko


// mis3si1pi
// missi1si1pi
// mississi1pi
// mississippi

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