Submission

Score: 100

User: bossc

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.002 second

Submitted On: 2026-04-16 13:40:53

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