#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    int arr[n];
    for (int i = 0; i < n; i++) {
      cin >> arr[i];
    }
    int count = 1;
    for (int i = 0; i < n - 1; i++) {
      if (abs(arr[i + 1] - arr[i]) % 2 != 0) {
        count = 0;
        break;
      }
    }
    if (count == 1) {
      cout << "YES" << endl;
    } else {
      cout << "NO" << endl;
    }
  }
}
