Submission

Score: 100

User: polikanta

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.002 second

Submitted On: 2026-09-27 19:19:30

#include<iostream>
using namespace std;
int main(){
    string card;
    cin >> card;
    int last = card[15] - '0';
    int r = 0;
    int count = 1;
    for (int i = 14; i >= 0; i--){
        int x  = card[i] - '0';
        if (count % 2 != 0){
            x = x * 2;
        }
        if (x >= 10){
            r = r + (x / 10)+(x % 10);
        }
        else{
            r = r + x;
        }
        count = count + 1;
    }
    int check = (10 - (r % 10))% 10;
    if (check == last){
        cout << "yes" << endl;
    }
    else{
        cout << "no" << endl;
    }
}