Monistus

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

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

    string s[2], u;
    ll j = 0, d, l, i;
    char c;

    cin >> s[j];
    l = s[j].length();

    for (i = 0; i < l - 1; i++)
        if (s[j][i] == '1')
            s[j][i] = s[j][i + 1];
    // cout << s[0] << "\n";

    for (c = '9'; c >= '2'; c--)
    {
        d = c - '0';
        l = s[j].length();
        s[1 - j].clear();
        for (i = 0; i < l; i++)
        {
            if (s[j][i] != c)
                s[1 - j] += s[j][i];
            else
            {
                u = s[j].substr(i + 1, d);
                s[1 - j] += u;
                s[1 - j] += u;
                i += d;
            }
        }
        j = 1 - j;
        // cout << s[j] << "\n";
    }
    cout << s[j] << "\n";
    return 0;
}

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: ACCEPTED

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