#include<cstdio>
#include<cstdlib>
#include<time.h>
#include<cmath>
#include<cstring>
#include<string>
#include<iostream>
#include<queue>
#include<map>
#include<set>
#include<stack>
#include<vector>
#include<algorithm>

//#include<bits/c++std.h>

#define Size 1000005
#define inf 2e9
#define INF 2e18
#define LL long long int
#define i64 __int64
#define ULL unsigned long long
#define Mod 1000000007
#define pi 4*atan(1)
#define eps 1e-8
#define lson now*2,l,l+(r-l)/2
#define rson now*2+1,l+(r-l)/2+1,r
#define Max(a,b) (a)>(b)?(a):(b)
using namespace std;
int n,m,k;
int ql,qr,pos;

int main()
{
    #ifndef ONLINE_JUDGE
//        freopen("input.txt","r",stdin);
//        freopen("output.txt","w",stdout);
    #endif // ONLINE_JUDGE
    int t;
    int x,y,z;
    srand(time(NULL));
    int Case=0;
    cin>>t;
    while(t--)
//    while(scanf("%d",&n)==1)
    {
//        printf("Case #%d: ",++Case);
        scanf("%d",&n);
        int flag1 = 0,flag2 = 0;
        int tmp;
        for(int i=0;i<n;++i)
        {
            scanf("%d",&tmp);
            if(tmp == 1)
            {
                flag1++;
            }
            if(tmp == 0)
            {
                flag2++;
            }
        }
        if(flag1 && flag2)
        {
            cout<<"YES"<<endl;
        }
        else
            cout<<"NO"<<endl;
    }
    return 0;
}