Chef_vs_Doof.cpp

#include <iostream>
using namespace std;

int main() {
	int t;
    cin>>t;
    while (t--)
    {
        int n;
        cin>>n;
        int arr[n];
        int countEven=0;
        for (int i = 0; i < n; i++)
        {
            cin>>arr[i];
            if(arr[i]%2==0){
                countEven++;
            }
        }
        if(countEven>0){
            cout<<"NO"<<endl;
        }
        else{
            cout<<"YES"<<endl;
        }

        
    }
    
	return 0;
}