#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);
    bool flag = 1;
    for (int i = 1; i < n; i++) {
      if (arr[i] - arr[i - 1] > 1) {
        flag = 0;
      }
    }
    if (flag)
      cout << "Yes" << endl;
    else
      cout << "No" << endl;
  }
  return 0;
}
