void summator(void *state, const void *element) {
    *(int *)state += *(const int *)element;
}

int main() {
    int result = 0;
    int init_val = 0;
    int a[10] = {1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
    std_accumulate((void *)(&result), a, sizeof(int), 10, &init_val, summator);
    printf("%d\n", result);
}