#include<iostream>
#include<stdio.h>
#include<string>
#include<cstring>
#include<math.h>
#include<algorithm>

using namespace std;

int main()
{
    int T,s1,s2;
    long long n,x;
    cin>>T;
    for(int k=1;k<=T;k++)
    {
        s1=0;
        s2=0;
        cin>>n;
        for(int i=1;i<=n;i++)
        {
            cin>>x;
            if(x==0) s1=1;
            if(x==1) s2=1;
        }
        if(s1==1&&s2==1) cout<<"YES"<<endl;
        else cout<<"NO"<<endl;
    }

    return 0;
}