#include <iostream>
#include <queue>
#include <cstdio>
#include <algorithm>
#include <string>
#include <vector>
#include <cstring>
#define inf 999999999
#define mo 1000000007
#define LL long long 
using namespace std;

int main()
{
    int t,n,flag,x,flag2;
    scanf("%d",&t);
    while (t--)
    {
        scanf("%d",&n);
        flag=0;flag2=0;
        for (int i =1;i<=n;i++)
        {
            scanf("%d",&x);
            if (x==1) flag=1;
            if (x==0) flag2=1;
        }
        if (flag && flag2) printf("YES\n");
        else printf("NO\n");
    }
}