#include <cstdio>
#include <cmath>
#include <cstring>
#include <algorithm>
using namespace std;

int t, n;

int main()
{
    scanf("%d", &t);
    for(int tm = 1; tm <= t; tm++)
    {
        scanf("%d", &n);
        int ans1 = 0, ans2 = 0, mid;
        for(int i = 0; i < n; i++)
        {
            scanf("%d", &mid);
            if(mid == 1) ans1 = 1;
            if(mid == 0) ans2 = 1;
        }
        if(ans1 == 1 && ans2 == 1) printf("YES\n");
        else printf("NO\n");
    }
    return 0;
}