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