Submission

Score: 100

User: 38408

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-13 15:24:51

#include<bits/stdc++.h>
using namespace std;
int main(){
    string word;
    cin >> word;
    int sum = 0;
    for (int i = 14; i >= 0; i--)
    {
        int digi = word[i]-'0';
        if ((14 - i) % 2 == 0) {
            digi *= 2;

            if (digi > 9) {
                digi = digi / 10 + digi % 10;
            }
        }
        sum += digi;
    }
    int check = (10 - sum % 10) % 10;
    int last = word[15] - '0';

    if (check == last) {
        cout << "yes\n";
    } else {
        cout << "no\n";
    }
    
    
    
}