#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    int a[n];
    for (int i = 0; i < n; i++) cin >> a[i];
    bool check = false;
    sort(a, a + n);
    for (int i = 1; i < n; i++) {
      if ((a[i] - a[i - 1]) % 2 == 0)
        continue;
      else {
        check = true;
        break;
      }
    }
    if (check == false)
      cout << "YES" << endl;
    else
      cout << "NO" << endl;
  }
  return 0;
}
