Submission

Score: 10

User: faofao

Problemset: ISBN

Language: cpp

Time: 0.002 second

Submitted On: 2025-10-13 09:27:20

#include <iostream>
using namespace std;

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