Submission

Score: 100

User: dentenplay5555

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.005 second

Submitted On: 2026-10-04 13:25:14

#include <iostream>
using namespace std;
int main() {
    string a;cin>>a;
    int s=0;
    int l=a.back()-'0';
    a.erase(a.end()-1);
    for (int i=a.size()-1;i>=0;i--) {
        int v=a[i]-'0';
        if (i%2==0) v*=2;
        s+=v/10;
        s+=v%10;
    }
    if ((10-(s%10))%10==l) cout<<"yes";
    else cout<<"no";
}