#include <bits/stdc++.h>   using namespace std;   int main() {     int t, n;     cin >> t;     while (t--) {       cin >> n;       int ar[n], e = 0, o = 0;       for (int i = 0; i < n; i++) cin >> ar[i];       for (int i = 0; i < n; i++) {         if (ar[i] % 2 == 0)           e = e + 1;         else           o = o + 1;       }       if ((e == n) || (o == n))         cout <<  YES  << endl;       else         cout <<  NO  << endl;     }     return 0;   }   