#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 f = true;       for (int j = 1; j < n; j++) {         int diff = abs(arr[j] - arr[j - 1]);         if (diff > 1) {           f = false;         }       }       if (f) {         cout <<  YES n ;       } else {         cout <<  NO n ;       }     }   }   