#include<iostream>
#include<vector>
#include<map>
#include<string>
#include<algorithm>
#include<cstdio>
using namespace std;
#define sz(v) (int)(v.size())
#define rep(i,a,n) for(int i=a;i<n;++i)
#define per(i,a,n) for(int i=n-1;i>=a;--i)
#define mem(a,t) memset(a,t,sizeof(a))
#define pb push_back
#define mp make_pair
#define fi first
#define se second
#define N 10005

int main()
{
    //freopen("in.txt","r",stdin);
    int T,n,t;
    scanf("%d",&T);
    while(T--){
        scanf("%d",&n);
        int f1=0,f2=0;
        rep(i,0,n){
            scanf("%d",&t);
            if(t==1)
                f2=1;
            if(t==0)
                f1=1;
        }
        if(f1&&f2)
            cout<<"YES";
        else
            cout<<"NO";
        cout<<endl;
    }
    return 0;
}