Submission

Score: 100

User: Permploy_Laotienchai

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-14 21:46:39

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

int main() {
    string a;
    cin >> a;
    int sum = 0;
    for(int i=0; i<15; i++) {
        if (i % 2 == 1) {
            sum += a[i] - '0';
        }else {
            int n = 2*(a[i] - '0');
            if(n < 10) {
                sum += n;
            }else {
                sum += n-9;
            }
        }
    }
    int b = sum % 10;
    int c = 10-b;
    int d = c % 10;


    if(d == a[15] - '0') {
        cout << "yes";
    }else {
        cout << "no";
    }
}