#include <cstdio>
#include <queue>
#include <cstdlib>
#include <iostream>
#include <algorithm>
#include <cstring>
#include <vector>
#define LL long long
#define pii pair <int, int>
#define piii pair <pii, int>
#define xx first
#define yy second
#define ls rt << 1
#define rs rt << 1 | 1
#define lson ls, l, m
#define rson rs, m + 1, r
#define psi pair <string, int>
using namespace std;

const int N = 100500;

int main () {
//    freopen ("in.txt", "r", stdin);
    int T;
    cin >> T;
    while (T--) {
        int n, flag1 = 0, x, flag0 = 0;
        cin >> n;
        for (int i = 1; i <= n; i++) {
            scanf ("%d", &x);
            if (x == 1) flag1 = 1;
            if (x == 0) flag0 = 1;
        }
        cout << ((flag1 && flag0) ? "YES" : "NO") << endl;
    }
}