#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(0);
  int i, j, k, n, t;
  cin >> t;
  while (t--) {
    cin >> n;
    int a[n];
    for (i = 0; i < n; ++i) {
      cin >> a[i];
      a[i] %= 2;
    }
    bool can = true;
    int x = a[0];
    for (i = 0; i < n; ++i)
      if (x != a[i]) can = false;
    cout << (can ? "YES\n" : "NO\n");
  }
  return 0;
}
