Monistus

input/code.cpp: In function 'int main()':
input/code.cpp:26:34: warning: comparison of integer expressions of different signedness: 'size_t' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   26 |             for (size_t i = 0; i < num; i++)
      |                                ~~^~~~~

    #include <bits/stdc++.h>
    #include <cmath>

#define NMAX 500001

char str_array[NMAX];
char str_array_in[NMAX];
char str_result[NMAX];


int main() {

    std::cin >> str_array_in;
    uint64_t N = strlen(str_array_in);

    std::memcpy(str_array + NMAX - 1 - N, str_array_in, N);

    uint64_t str_i = NMAX - N -1;
    uint64_t str_result_i = 0;

    while (str_i < NMAX-1)
    {
        if(str_array[str_i] < 'a'){
            int num = (str_array[str_i] - '0');
            
            for (size_t i = 0; i < num; i++)
            {
                str_array[str_i - num + i + 1] = str_array[str_i + i + 1];
            }
            str_i = str_i - num + 1;
        } else
        {
            str_result[str_result_i] = str_array[str_i];
            str_result_i++;
            str_i++;
        }
        
    }

    std::cout << str_result << std::endl;
    return 0;
}

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: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 2

Verdict: ACCEPTED

Test 12

Group: 2

Verdict: ACCEPTED

Test 13

Group: 2

Verdict: ACCEPTED

Test 14

Group: 2

Verdict: ACCEPTED