#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;   }   