#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t--) {
    int n, k = 0;
    cin >> n;
    int a[n];
    for (int i = 0; i < n; i++) {
      cin >> a[i];
    }
    sort(a, a + n);
    for (int i = 0; i <= n - 2; i++) {
      if (a[i + 1] - a[i] > 1) k++;
    }
    if (k > 0)
      cout << "NO"
           << "\n";
    else
      cout << "YES"
           << "\n";
  }
  return 0;
}
