Submission

[PPPPPPPPPP]

Score: 100

User: solarsunny

Problemset: ตรวจบัตรเครดิต

Language: c

Time: 0.002 second

Submitted On: 2024-12-18 16:15:04

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>
#include <string.h>
int c[16];

int main() {
    char a[100];
    scanf("%s", a);
    for(int i=0; i<15; i++) {
        c[i] = a[i]- '0';
    }
    int b = a[15]-'0';
    for(int i=14; i>=0; i-=2) {
        c[i] = c[i] * 2;
    }
    for(int i=0; i<15; i++) {
        if(c[i] > 9) {
            c[i] = c[i]%10 + 1;
        }
    }
    int s=0;
    for(int i=0; i<15; i++) {
        s += c[i];
    }
    s = (10-(s%10))%10;
    if(s == b) {
        printf("yes");
    } else {
        printf("no");
    }
    printf("\n");
    return 0;
}