#include <iostream>
#include <cstring>
using namespace std;

void solve()
{
    int n;
    scanf("%d", &n);
    int x0=0, x1=0;
    for (int i=0; i<n; ++i) {
        int t;
        scanf("%d", &t);
        if (t == 0) {
            x0 = 1;
        }
        if (t == 1) {
            x1 = 1;
        }
    }
    printf(x1&&x0? "YES\n" : "NO\n");
}

int main()
{
    int n;
    scanf("%d", &n);
    for (int i=0; i<n; ++i) {
        solve();
    }
    return 0;
}