[C++] HackerRank 해커랭크 Sansa and XOR

문제링크 : https://www.hackerrank.com/challenges/sansa-and-xor

#include <bits/stdc++.h>
 
using namespace std;
 
int sansaXor(vector <int> arr) {
    // Complete this function
    int res = 0;
    if(!(arr.size() % 2))
        return 0;
    else{
        for(int i = 0; i <= arr.size()/2; i++)
            res ^= arr[i*2];
        return res;
    }
}
 
int main() {
    int t;
    cin >> t;
    for(int a0 = 0; a0 < t; a0++){
        int n;
        cin >> n;
        vector<int> arr(n);
        for(int arr_i = 0; arr_i < n; arr_i++){
           cin >> arr[arr_i];
        }
        int result = sansaXor(arr);
        cout << result << endl;
    }
    return 0;
}