Submission

Score: 0

User: lupniexx

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.002 second

Submitted On: 2025-09-25 19:08:40

#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-1)/2;i++){
        int x;
        x=s[i];
        s[i]=s[len-2-i];
        s[len-2-i]=x;
    }
    for(int i=0;i<len;i++){
        n[i]=s[i]-48;
    }
    for(int i=0;i<len-1;i++){
        if(i%2==0){
            n[i] *= 2;
            if(n[i]>9){n[i]-=9;}
        }
        r+=n[i];
    }
    if(10-(r%10)%10==n[len-1]){cout<<"yes";}
    else {cout << "no";}
}