#include <algorithm>
#include <string>
#include <iostream>
#include <string.h>
#include<stdio.h>
#include<cmath>
#include<vector>
using namespace std;
#define ll  long long int
const int maxn=1000000;

int a[maxn];
int main()
{
   int t;
   cin>>t;
   while(t--)
   {
       int n,f1,f2;
       f1=f2=0;
       scanf("%d",&n);
       for(int i=0;i<n;i++)
       {
            scanf("%d",&a[i]);
            if(a[i]==1) f1=1;
            if(a[i]==0) f2=1;
       }
       if(f1&&f2) printf("YES\n");
       else printf("NO\n");
   }


}