@[xuyangming](/user/1105563)
```
#include<bits/stdc++.h>
using namespace std;
int q,n;
int a;
int main(){
scanf("%d",&q);
while(q--)
{
scanf("%d",&n);
map<int,bool> vis;
for(int i=1;i<=n;i++)
{
scanf("%d",&a);
if(!vis[a])
{
cout<<a<<" ";
}
vis[a]=1;
}
cout<<"\n";
}
return 0;
}
```
by Max6700 @ 2024-08-13 21:52:18