HDOJ1040

#include <iostream> 
#include <cstring>
#include <string>
#include <cstdio>
#include <algorithm>


using namespace std;


int a[1010];


int main()
{
int t;
cin >> t;
for (int i = 0; i < t; i++)
{
int n;
cin >> n;
for (int i = 0; i < n; i++) cin >> a[i];
sort(a, a + n);
int mark=-1;
for (int i = 0; i < n; i++)
{
if (a[i] != mark)
{
mark = i;
cout << a[i];
if (i < n - 1) cout << " ";
}
}
cout << endl;
}
return 0;
}