利用TreeSet的有序性、无重复性:
import java.util.*; public class Main { public static void main(String[] args){ Scanner sc = new Scanner(System.in); Set<Integer> v = new TreeSet<>(); int n = sc.nextInt(); while (sc.hasNext()) v.add(sc.nextInt()); for(Integer i : v) System.out.printf("%d ", i); } }