Submission

Score: 100

User: Evil_Guest

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-12 01:41:02

#include<bits/stdc++.h>
using namespace std;

int main(){
    int sum=0;
    string s;
    cin>>s;
    for(int i=s.length()-2;i>=0;i--){
        int x=s[i]-'0';
        if(i%2==0)x*=2;
        if(x<=9)sum+=x;
        else sum+=x%10+1;
    }
    if((10-sum%10)%10==(s[s.length()-1])-'0')cout<<"yes";
    else cout<<"no";
}