#include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       long long int n;       cin >> n;       vector<long long int> arr;       long long int num;       for (int i = 0; i < n; i++) {         cin >> num;         arr.push_back(num);       }       sort(arr.begin(), arr.end());       long long int sum = 0;       for (int i = 0; i < n - 1; i++) {         if (arr[i] != arr[i + 1]) {           sum++;         }       }       cout << sum + 1 << endl;     }   }   