#include <bits/stdc++.h> using namespace std; int t, n; set<int> s; int main() { ios::sync_with_stdio(0); cin >> t; while (t--) { s.clear(); cin >> n; for (int i = 0; i < n; i++) { int a; cin >> a; s.insert(a); } cout << s.size() << endl; } return 0; }
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