#include <iostream>
#include <cstdio>
#include <cstring>
#include <vector>
using namespace std;


int main()
{
    int cas,n;
    scanf("%d",&cas);
    while(cas--)
    {
        scanf("%d",&n);
        int flag = 0;
        int f = 0;
        for(int i=0;i<n;i++)
        {
            int x;
            scanf("%d",&x);
            if(x == 1) flag = 1;
            if(x == 0) f = 1;
        }
        printf("%s\n",flag&&f?"YES":"NO");
        //if(cas) cout<<endl;
    }
    //cout<<endl;
    return 0;
}