C++ :

#include <iostream>
using namespace std;
int main() {
    int t[500]={0};
    int n;
    cin >> n;
    for (int i = 0; i < n; ++i) {
        int x;
        cin >> x;
        x+=200;
        t[x]++;
    }

    for (int i = 0; i < 500; ++i) {
        if (t[i] == 0) continue;
        cout << i - 200 << " ";
    }

    return 0;
}