#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<algorithm>
#include<vector>
#include<list>
#include<set>
#include<map>
#include<stack>
#include<queue>
#include<deque>
#define mem(x,y) memset(x,y,sizeof(x))
#define pb push_back
using namespace std;
typedef long long ll;
typedef unsigned long long ull;
typedef pair<ll,ll> pii;
#define bug puts("===========");
const double pi=(acos(-1.0));
const double eps=1e-8;
const ll INF=1e18+10;
const ll inf=1e14;
const int maxn=1000+10;
const int mod=100000007;
/*===============================*/
int main()
{
    int T_T,n;
    scanf("%d",&T_T);
    while(T_T--){
        scanf("%d",&n);
        int h0=0,h1=0,a;
        for(int i=0;i<n;i++)
        {
            scanf("%d",&a);
            if(a==0) h0=1;
            if(a==1) h1=1;
        }
        if(h0&&h1) printf("YES\n");
        else printf("NO\n");
    }
    return 0;
}