#include<map>
#include<cmath>
#include<queue>
#include<cmath>
#include<string>
#include<cstdio>
#include<stack>
#include<iostream>
#include<cstring>
#include<algorithm>
#define inf 0x3f3f3f3f
#define eps 1e-8
#define ls l,mid,rt<<1
#define rs mid+1,rt,rt<<1|1
#define LL __long long 64
#define ll long long
#include<cmath>
#include<set>
using namespace std;
int arr[1000000];
int main(){
    int n,m,k,i,j;
    int cla;
    scanf("%d",&cla);
    while(cla--){
        scanf("%d",&n);
        bool v1,v2;
        v1=v2=false;
        for(i = 0;i < n;++ i){
            scanf("%d",&m);
            if(m==1)
                v1=true;
            if(m==0)
                v2=true;
        }
        if(v1&&v2){
            puts("YES");
        }
        else
            puts("NO");
    }
    return 0;
}