Submission

Score: 100

User: boygunner

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.004 second

Submitted On: 2026-09-30 22:35:12

#include<bits/stdc++.h>
using namespace std;
int main(){
	string code,ncode;
	cin>>code;
	reverse(code.begin(),code.end());
	for(int i=1;i<=15;i++){
		int n;
		if(i%2!=0){
			n=(code[i]-'0')*2;
			if(n>=10){
				ncode=ncode+(char)(n/10+'0')+(char)(n%10+'0');
			}
			else ncode=ncode+(char)(n+'0');	
		}
		else ncode=ncode+code[i];
	}
	int sum=0;
	for(int i=0;i<ncode.length();i++)
		sum=sum+ncode[i]-'0';
	sum=(10-(sum%10))%10;
	if(sum ==code[0]-'0')cout<<"yes";
	else cout<<"no";
}