Submission

Score: 100

User: The3e

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-02 15:05:11

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

int main() {
    string card;
    cin >> card;

    int sum = 0;
    int pos = 1;

    for (int i = 14; i >= 0; i--) {
        int digit = card[i] - '0';

        if (pos % 2 == 1) {
            digit = digit * 2;

            if (digit >= 10) {
                digit = digit / 10 + digit % 10;
            }
        }

        sum += digit;
        pos++;
    }

    int check = (10 - (sum % 10)) % 10;

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

    return 0;
}