Monistus

// https://cses.fi/484/task/B
 
#include <iostream>
using namespace std;
#define ll long long
 
int main() {
    string word;
    cin >> word;
    while (true)
    {   
        bool end = true;
        int n = word.size();
        string word_array[n];
    
        for (int i = 0; i < n; i++)
        {
            char a = word[i];
    
            if (isalpha(a)) {
                word_array[i] = a;
            } else {
                end = false;
                word_array[i] = "";
                int number = int(a) - 48;
    
                for (int j = 1; j <= number; j++)
                {
                    word_array[i] += word[i+j];
                }
            }
        }
        string new_word = "";
        for (int i = 0; i < n; i++)
        {
            new_word.append(word_array[i]);
        }
        word = new_word;
        if (end == true) {
            for (int i = 0; i < n; i++)
            {
                cout << word_array[i];    
            }
            cout << endl;
            break;
        }
    }

    
}

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: WRONG ANSWER

Test 10

Group: 2

Verdict: RUNTIME ERROR

Test 11

Group: 2

Verdict: ACCEPTED

Test 12

Group: 2

Verdict: ACCEPTED

Test 13

Group: 2

Verdict: ACCEPTED

Test 14

Group: 2

Verdict: ACCEPTED