Submission

Score: 95

User: Whatthepoop

Problemset: ISBN

Language: c

Time: 0.002 second

Submitted On: 2025-10-12 19:07:05

#include <stdio.h>

int main() {
    int sum = 0;
    for (int i = 10; i >= 2; i--) {
        int num;
        scanf("%d", &num);
        sum += num * i;
    }

    int check = 11 - (sum % 11);
    if (check == 11) check = 0;

    if (check == 10)
        printf("X");
    else
        printf("%d", check);

    return 0;
}