Submission

Score: 100

User: Prima

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-12 09:24:35

#include<iostream>
using namespace std;

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