#pragma comment(linker, "/STACK:1024000000,1024000000") 
#include<stdio.h>
#include<iostream>
#include<vector>
#include<string.h>
#include<set>
#include<string>
#include<map>
#include<algorithm>
#include<math.h>
#include<cmath>
using namespace std;
int n,a[100005];
int main()
{
    int T;
    scanf("%d",&T);
    while(T--)
    {
       scanf("%d",&n);
       bool f1=false,f2=false;
       for(int i=0;i<n;i++){
           scanf("%d",&a[i]);
           if(a[i]==0) f1=1;
           if(a[i]==1) f2=1;
       }
       if(n>1){
         if(f1 && f2){
             printf("YES\n");
             continue;
         }
       }
        printf("NO\n");
    }
    return 0;
}