Monistus

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

string inp;
char bString[1000];
char nString[9];
char rString[1000];
int indexSize;
string gen[100000];
bool dontContinue;
string res;
string build(string start, string insert, string end) {
    return start + insert + end;
}

string doCycle(string input) {
    dontContinue = true;
    //cout << "Doing cycle for: " << input << endl;
    for (int index = 0; index < int(input.size()); index++)
    {
        if (isdigit(input[index])) {
            memset(bString, 0, sizeof bString);
            memset(nString, 0, sizeof nString);
            memset(rString, 0, sizeof rString);
            dontContinue = 0;
            for (int x = 0; x < index; x++) {
                bString[x] = input[x];
            }

            indexSize = input[index] - 48;
            //cout << "number" << indexSize << "found at " << index;


            for (int j = 1; j <= indexSize; j++)
            {
                nString[j - 1] = input[index + j]; //nstring = we insert into middle

            }

            for (int k = 1; (k + index) < int(input.size()); k++) 
            {
                rString[k - 1] = input[index + k]; //rstring we add to the end
            }
            return build(bString, nString, rString);
        }

    }
    return input;
}
int main() {
    cin >> inp;
    if (int(inp.length()) > 20) {
        return 0;
    }


    gen[0] = doCycle(inp);
    for (int i = 1; i < 1000; i++) {

        gen[i] = doCycle(gen[i - 1]);

        //cout << "curgen: " << gen[i - 1];
        if (dontContinue == true) {
            res = doCycle(gen[i]);

            break;
        }
    }
    cout << res;
}

Test 1

Group: 1, 2

Verdict: WRONG ANSWER

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: WRONG ANSWER

Test 9

Group: 2

Verdict: WRONG ANSWER

Test 10

Group: 2

Verdict: WRONG ANSWER

Test 11

Group: 2

Verdict: WRONG ANSWER

Test 12

Group: 2

Verdict: WRONG ANSWER

Test 13

Group: 2

Verdict: WRONG ANSWER

Test 14

Group: 2

Verdict: WRONG ANSWER