#include <iostream>
#include <cstdio>
#include <cstring>
#include <cmath>
#include <algorithm>
#include <vector>
#include <set>
typedef long long ll;
using namespace std;
int arr[100010];
int main(){
    int t;
    scanf("%d",&t);
    while(t--){
        int n; scanf("%d",&n);
        int l =0 ,r = 0;
        for(int i=0;i<n;i++){
            scanf("%d",&arr[i]);
            if(arr[i] == 0){
                l = 1;
            }
            if(arr[i] == 1)
                r = 1;
        }
        if(l && r){
            printf("YES\n");
        }
        else
            printf("NO\n");
    }
    return 0;
}