Submission

Score: 0

User: lupniexx

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.003 second

Submitted On: 2025-09-25 19:20:07

#include<bits/stdc++.h>
#include<string>
using namespace std;
int main(){
    string s;
    int n[16];
    int r=0;
    cin >> s;
    int len = s.length();
    for(int i=0;i<len;i++){
        n[i]=s[i]-48;
    }
    for(int i = 0; i < 15; i++) {
        int digit = n[i];
        if(i % 2 == 0) { 
            digit *= 2;
            if(digit > 9) digit -= 9;
        }
        r += digit;
    }
    if(10-(r%10)%10==n[len-1]){cout<<"yes";}
    else {cout << "no";}
}