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| #include <bits/stdc++.h>
using namespace std;
const int LEN = 5e4 + 50;
int n;
unordered_map<int, bool> mp;
void f() {
int in;
cin >> n;
while (n--) {
cin >> in;
if (!mp.count(in)) {
cout << in << " ";
mp[in] = true;
}
}
mp.clear();
cout << endl;
}
int main() {
ios::sync_with_stdio(false);
cin.tie(0);
int t;
cin >> t;
while (t--) f();
return 0;
}
|