import java.util.*; public class Main { public static void main(String[] args){ Scanner s = new Scanner(System.in); while (s.hasNext()){ int n = s.nextInt(); Map<Integer,Integer> map = new HashMap<>(); int count = 0;//一定要用count来放,不然一会用map.get找不到的 for(int i =0;i<n;i++){ int k =s.nextInt(); if(!map.containsValue(k)){ map.put(count,k); count++; } } int [] out = new int[map.size()];//size要弄好,不然头痛 for(int i =0;i<map.size();i++){ out[i] = map.get(i); } Arrays.sort(out); for(int i =0;i<out.length;i++){ System.out.println(out[i]); } } } }