#include <bits/stdc++.h>
using namespace std;
int main() {
    int t;
    cin >> t;
    while (t--){
        int n;
        int a[n];
        cin >> n;
 
        for (int i = 0; i < n; i++){
            cin >> a[i];
        }
        if (n == 1){
            cout << 1 << '\n';
            continue;
        }
        sort (a, a+n);
        int brojac = 1;
        for (int i = 1; i < n; i++){
            if (a[i] != a[i-1]){
                brojac++;
            }
        }
        cout << brojac << '\n';
 
    }
    return 0;
}

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MwozCjEgMiAzCjUKMyAxIDQgMSA1CjEKMQo=

3
3
1 2 3
5
3 1 4 1 5
1
1