Submission

Score: 0

User: mister_o_hater_no1

Problemset: ตรวจบัตรเครดิต

Language: cpp

Time: 0.002 second

Submitted On: 2025-09-11 16:15:33

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

int main() {
    cin.tie(nullptr)->sync_with_stdio(0);
    int credit[16], sum= 0;
    for (int i= 0; i< 16 && (cin>> credit[i]); ++i);
    for (int i= 15; i>= 0; --i) {
    	if(i% 2== 0) {
    		credit[i]*= 2;
    		if(credit[i]> 9) credit[i]= (credit[i]/ 10) + (credit[i]% 10);
    	}
    	sum+= credit[i];
    }
    cout<< (10- (sum% 10))% 10;

    return 0;
}