#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 sum = 1;
    for (int i = 0; i < n - 1; i++) {
      if (arr[i] != arr[i + 1]) {
        sum++;
      }
    }
    cout << sum << endl;
  }
  return 0;
}
