Submission

Score: 100

User: nagornz_ph

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.004 second

Submitted On: 2025-09-16 19:45:37

#include <stdio.h>

int main(){
    char str[16];
    scanf("%s", str);
    int a[16];
    for (int i = 0; i < 16; i++) {
        a[i] = str[i] - '0';
    }
    int sum = 0;
    for (int i = 0; i < 15; i++) {
        if (i % 2 == 0) a[i] *= 2;
        if (a[i] > 9) sum += a[i] % 10 + 1;
        else sum += a[i];
    }
    if ((10 - (sum % 10)) % 10 == a[15]) {
        printf("yes");
    }
    else {
        printf("no");
    }
}