Dynamic-Array-in-C.c

int main()
{
    int total_number_of_shelves;
    scanf("%d", &total_number_of_shelves);
    
    int total_number_of_queries;
    scanf("%d", &total_number_of_queries);
    total_number_of_books = (int*) calloc(total_number_of_shelves , sizeof(int));
    total_number_of_pages = (int**) calloc(total_number_of_shelves , sizeof(int*));
    while (total_number_of_queries--) {
        int type_of_query;
        scanf("%d", &type_of_query);
        if (type_of_query == 1) {
            int x, y;
            scanf("%d %d", &x, &y);
            total_number_of_books[x]++;
            total_number_of_pages[x] = (int*) realloc(total_number_of_pages[x], total_number_of_books[x] * sizeof(int));
            total_number_of_pages[x][total_number_of_books[x]-1] = y;