A_Common_Multiple.cpp

#include<bits/stdc++.h>
using namespace std;

#define IOS ios::sync_with_stdio(0); cin.tie(0); cout.tie(0);
#define nline "\n" 
#define fo(i,n) for(int i = 0;i<n;i++)
#define pb push_back
#define F first
#define S second
#define int long long
typedef long double ld;
typedef vector<signed> vi;
typedef vector<vector<signed>> vvi;
typedef vector<int> vll;
typedef vector<vector<int>> vvll;
const int mod = 1e9+7;


signed main(){
    IOS;

    #ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout); 
    #endif

    //Let's Code
    int t;
    cin>>t;
    while(t--){
        int n;
        cin >> n ;
        set < int > input;
        for( int i = 0; i < n; i++){
            int val;
            cin >> val;
            input.insert(val);
        }
        cout << input.size() << nline;
    }
}