#include<iostream>
#include<cstdio>
using namespace std;
int main()
{
    int T;
    cin>>T;
    while(T--)
    {
        int n;
        cin>>n;
        int ans1=0,ans2=0;
        int a;
        while(n--)
        {
            cin>>a;
            if(a==0) ans1=1;
            if(a==1) ans2=1;
        }
        if(ans1==1&&ans2==1) cout<<"YES"<<endl;
        else cout<<"NO"<<endl;
    }
    return 0;
}