#include <bits/stdc++.h>
using namespace std;
int main() {
  int t;
  cin >> t;
  while (t > 0) {
    int n, count = 0;
    cin >> n;
    int a[n];
    for (int i = 0; i < n; i++) {
      cin >> a[i];
    }
    sort(a, a + n);
    for (int i = 0; i < n; i++) {
      if (a[i] - a[i + 1] != 0) {
        count++;
      }
    }
    cout << count << endl;
    t--;
  }
  return 0;
}
