B. CopyCopyCopyCopyCopy

	#include <bits/stdc++.h>

using namespace std ;
#define sz(s) int(s.size())
typedef long long ll ;
#define all(v) v.begin() , v.end()

void ABDEL3AL () {
    ios_base::sync_with_stdio(false); cin.tie(nullptr) , cout.tie(nullptr) ;
#ifndef ONLINE_JUDGE
    freopen("input.txt" , "r" , stdin) , freopen("output.txt" , "w" , stdout) ;
#endif
}

int main() {
    ABDEL3AL() ;
    int t ; cin >> t ;
    while (t--) {
        int n ; cin >> n ;
        int sz = n ;
        ll arr[n] ;
        for (int i = 0; i < n; i++) cin >> arr[i] ;
        sort (arr , arr + n) ;
        for (int i = 1; i < n; i++)
            if (arr[i] == arr[i - 1]) sz -= 1;
        cout << sz << "\n" ;
    }
    return 0;
}