Submission

Score: 0

User: APNICHANAN

Problemset: ตรวจบัตรเครดิต

Language: c

Time: 0.002 second

Submitted On: 2025-09-27 09:10:43

#include <stdio.h>
int main()
{
    char num[17];
    int sum = 0, a, b;
    scanf("%s", num);
    for (int i = 0; i < 15; i++)
    {
        a = num[14 - i] - 48;
        if (i % 2 == 0)
            a *= 2;
        b = (a - (a % 10)) / 10;
        sum += b;
        a = a % 10;
        sum += a;
    }
    if (10 - (sum % 10) % 10 == num[15] - 48)
        printf("yes");
    else
        printf("no");
}