HackerRank - week code 27 - zero nim sum - submission from https://www.hackerrank.com/yaray

zeroNimsum_studycode2.cpp

#include <iostream>
using namespace std;

int main()
{
  cin.sync_with_stdio(0);
  long cases, n, s, x = 0;
  for (cin >> cases; cases--; ) {
    s = 0;
    cin >> n;
    while (n--) {
      cin >> x;
      s ^= (x+1^1)-1;
    }
    cout << "WL"[!s] << '\n';
  }
}