Submission

Score: 100

User: cj

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.004 second

Submitted On: 2026-10-04 13:36:15

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

int main(){
	string s;
	int R = 0;
	cin>>s;
	int las =s[15] - '0';
	s.pop_back();
	for(int i=0;i<15;i++){
		if((i+1)%2 != 0){
			int nb = ((s[i] - '0')*2);
			if(nb < 10){
				R += nb;
			}else{
				R += nb%10;
				R += nb/10;
			}
		}else{
			R += s[i]-'0';
		}
	}
	int ans = (10 - (R%10))%10;
	if(ans == las){
		cout<<"yes";
	}else{
		cout<<"no";
	}
}