#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    int a[n];
    for (int i = 0; i < n; i++) cin >> a[i];
    sort(a, a + n);
    int f = 0;
    for (int i = n - 1; i > 0; i--) {
      if (a[i] - a[i - 1] > 1) f = 1;
    }
    if (f == 0)
      cout << "YES";
    else
      cout << "NO";
    cout << endl;
  }
}
