Submission

Score: 0

User: Karatat007

Problemset: ISBN

Language: cpp

Time: 0.005 second

Submitted On: 2026-10-03 21:07:54

#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    string isbn;
    cin >> isbn;
    int sum = 0;
    for(int i = 0;i < 9;++i){
        sum += (10 - i) * (isbn[i] - '0');
    }
    cout << 11 - sum % 11;
}