Submission

Score: 100

User: Gundhon

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-12 20:23:04

#include <iostream>
#include <algorithm>

using namespace std;

int main(){
    string s;
    cin >> s;
    int sum = 0;
    int w = s[s.size()-1] - '0';
    s.erase(s.size()-1);
    reverse(s.begin(),s.end());

    for(int i = 0 ; i < s.size(); i++){
        s[i] = s[i] - '0';
        if(i % 2 == 0){
            s[i] = s[i]*2;
        }
    }

    for(int x: s){
        if(x >= 10 && x <= 99){
            sum = sum + (x%10) + (x/10);
        }
        else{
            sum += x;
        }
    }

    if((10 - (sum % 10))%10 == w) cout << "yes";
    else cout << "no";

    
    return 0;
}