#include <iostream>
#include<cstdio>
#include<algorithm>
#include<cstring>
using namespace std;
int a[100006];
void solve(){
    int t;
    scanf("%d",&t);
    while(t--){
      int n;
      scanf("%d",&n);
      int flag1 = 0,flag = 0;
      for(int i = 1; i<=n; i++){
            scanf("%d",&a[i]);
        if(a[i] == 0) flag = 1;
        if(a[i] == 1) flag1 = 1;
      }
      if(flag&&flag1) printf("YES\n");
      else printf("NO\n");
    }
}
int main()
{
    solve();
    return 0;
}