Submission

Score: 100

User: porpeang

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.004 second

Submitted On: 2026-09-30 14:41:10

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

int main(){
    vector<int>ja;
    int a,b,c,d,e,k,sum=0,def=0;
    string f;

    cin>>f;
    k = f[15] - '0';
    int pos = 1;
    for(int i = 14; i >= 0; i--){
        int num = f[i] - '0';
        if(pos % 2 != 0){
            num *= 2;
        }
        sum += (num / 10) + (num % 10); // ⭕ รวมค่า sum ในลูปนี้ได้เลย
        pos++;
    }
    def=(10-(sum%10))%10;
    if(def==k){
        cout<<"yes";
    }
    else{
        cout<<"no";
    }
}