#include <cstdio>
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <algorithm>
#include <queue>
#include <map>
#include <set>
#include <iostream>
using namespace std;

typedef long double ld;
typedef long long ll;
typedef pair<ll, ll> pii;
#define X first
#define Y second

using namespace std;

int main() {
    int T;
    cin >> T;
    while(T --) {
        int n;
        scanf("%d", &n);
        bool f1 = 0, f2 = 0;
        for(int i = 1; i <= n; i ++) {
            int num = 0;
            scanf("%d", &num);
            f1 |= num == 0;
            f2 |= num == 1;
        }
        if(f1 && f2) puts("YES");
        else puts("NO");
    }
}