Submission

Score: 100

User: vachirasawin

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.002 second

Submitted On: 2026-03-13 16:43:38

// grader-chan
// c1_bkk67_5.cpp | c1_bkk67_5

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

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

    string code;
    cin >> code;

    int total = 0;
    for (int i = 0; i < code.size() - 1; i++) {
        int n = code[i] - '0';

        if (i % 2 == 0) {
            if (n >= 5) {
                total += 1 + ((n * 2) % 10);
            } else {
                total += n * 2;
            }
        } else {
            total += n;
        }
    }

    cout << (((10 - (total % 10)) % 10 == code[code.size() - 1] - '0') ? "yes" : "no");

    return 0;
}