Submission

Score: 100

User: Peam

Problemset: ISBN

Language: c

Time: 0.002 second

Submitted On: 2025-10-11 16:18:36

#include <stdio.h>
int main(){
    int sum = 0, c = 10;
    int num;
    for(int i = 0; i < 9; i++){
        scanf("%d", &num);
        sum += num * c;
        c--;
    }

    int r = sum % 11;
    if(r == 0){
        printf("0");
        return 0;
    }

    for(int i = 1; i < 11; i++){
        if(r + i == 11){
            printf("%d", i);
            break;
        }
    }
    return 0;
}