对于我来说不简单，不过也是一道简单的题。

#include <bits/stdc++.h>
using namespace std;
int n;
int a[1001];
int main()
{
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> a[i];
    }
    sort (a + 1, a + n + 1);
    for (int i =1; i<=n; i++)
    {
        if(a[i]==a[i+1])
        {
            continue;
        }
        cout << a[i] << " ";
    }
    return 0;
}