Monistus

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

using namespace std;

string replace(string sAll, string sStringToRemove, string sStringToInsert)
{
   int iLength = sStringToRemove.length();
   size_t index = 0;
   while (true)
   {
      /* Locate the substring to replace. */
      index = sAll.find(sStringToRemove, index);
      if (index == std::string::npos)
         break;

      /* Make the replacement. */
      sAll.replace(index, iLength, sStringToInsert);

      /* Advance index forward so the next iteration doesn't pick it up as well. */
      index += iLength;
   }
   return sAll;
}

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

    string a;

    cin >> a;

    // auto start = std::chrono::steady_clock::now();

    long unsigned int i = 0;
    int o = 0;
    string c = "";
    while (i < a.length() && o < 499990){

        char s = a.at(i);
        if(s >= '0' && s <= '9'){
            o += 1;
            int b = s - '0';
            if(i != 0) c.append(a.substr(0, i));
            string kopio = a.substr(i+1, b);
            a = replace(a,  a.substr(i, b+1), kopio.append(kopio)).substr(i);

            i = 0;
        }
        else{
            i++;
        }
    }
    string hoo = c.append(a);
    cout << hoo;
    // auto end = std::chrono::steady_clock::now();
    // std::chrono::duration<double> elapsed_seconds = end - start;
    // cout << elapsed_seconds.count();
}

// a = input()
// i = 0
// while i < len(a):
//     s = a[i]
//     if(s.isnumeric()):
//         b = int(s)
//         a = a[:i] + a[i+1:i+b+1] + a[i+1:]
//     else: i += 1

// print(a)

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: ACCEPTED

Test 6

Group: 1, 2

Verdict: ACCEPTED

Test 7

Group: 1, 2

Verdict: WRONG ANSWER

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 10

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 11

Group: 2

Verdict: ACCEPTED

Test 12

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 2

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 2

Verdict: TIME LIMIT EXCEEDED