Submission

Score: 100

User: loop

Problemset: ISBN

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-10 18:32:06

#include <iostream>
#include <string>
using namespace std;

int main() {
    string all, s = "";
    while (cin >> all)
        for (int i = 0; i < (int)all.size(); i++)
            if (all[i] >= '0' && all[i] <= '9' && s.size() < 9) s += all[i];
    int sum = 0;
    for (int i = 0; i < 9; i++) sum += (10 - i) * (s[i] - '0');
    cout << (11 - sum % 11) % 11 << '\n';
    return 0;
}