Submission

Score: 100

User: Karatat007

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-02 10:18:00

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

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

    string creditno;
    cin >> creditno;
    int sum = 0;
    for(int i = 0;i < 16;++i){
        int n = creditno[i] - '0';
        if(i%2 == 0){
            if(2*n >= 10) sum += 2*n - 9;
            else sum += 2*n;
        }
        else sum += n;
    }
    if(sum%10 == 0) cout << "yes";
    else cout << "no";
}