/**************************************************************
    User: error408
    Language: C/C++
    School: SSDUT
    Saying: Do one thing at a time,and do well.
****************************************************************/
#include <iostream>
#include <vector>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>
#include <cstdio>
#include <string>
#include <cstring>
#include <cmath>
#include <ctime>
using namespace std;

#define clr(s,x) memset((s),(x),sizeof(s))
#define lson l,m,rt<<1
#define rson m+1,r,rt<<1|1
#define lowbit(x) (x&(-x))
#define PB push_back
#define For(i,a,b) for(int i=a;i<b;i++)
#define FOR(i,a,b) for(int i=a;i<=b;i++)
#define RL(N) scanf("%I64d",&N)
#define RLL(L,R) (RL(L),RL(R))

typedef long long               LL;
typedef unsigned int            uint;
typedef unsigned long long      ULL;
typedef vector<int>             vint;
typedef vector<string>          vstring;

/************************************END DEFINE*********************************************/

int main()
{
    int t;
    cin>>t;
    while(t--){
        int n;
        scanf("%d",&n);
        bool ok1 = false,ok2 = false;
        for(int i=0;i<n;i++){
            int x;
            scanf("%d",&x);
            if(x == 1)ok1 = true;
            if(x == 0)ok2 = true;
        }
        if(ok1 && ok2) puts("YES");
        else puts("NO");
    }
    return 0;
}