#include <algorithm>
#include <iostream>
#include <sstream>
#include <cstring>
#include <cstdio>
#include <cstdlib>
#include <vector>
#include <string>
#include <queue>
#include <stack>
#include <cmath>
#include <set>
#include <map>
#define PI 3.1415926
#define MAXN 2850
#define MAXM 2850
using namespace std;
typedef __int64 ll;
const int inf = 0x3f3f3f3f;
int main()
{
    //freopen("D://in.txt","r",stdin);
    int T;
    scanf("%d",&T);
    while(T--)
    {
        int n;
        int x;
        scanf("%d",&n);
        bool ans=false;
        bool ans1=false;
        for(int i=0;i<n;i++)
        {
            scanf("%d",&x);
            if(x==1)
                ans=true;
            if(x==0)
                ans1=true;
        }
        if(ans&&ans1)
        {
            printf("YES\n");
        }
        else
            printf("NO\n");
    }
    return 0;
}