#include <iostream>
#include <cstdio>
#include <cstring>
#include <stack>
#include <queue>
#include <map>
#include <set>
#include <vector>
#include <cmath>
#include <algorithm>
using namespace std;
const double eps = 1e-6;
const double pi = acos(-1.0);
const int INF = 0x3f3f3f3f;
const int MOD = 1000000007;
#define ll long long
#define CL(a,b) memset(a,b,sizeof(a))
#define lson (i<<1)
#define rson ((i<<1)|1)
#define MAXN 100010


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