import java.util.*; public class Main{ public static void main(String[] args) { Scanner scan = new Scanner(System.in); int sum = scan.nextInt(); //获取总数n // TreeSet集合的特点是：元素不重复,元素有序 TreeSet<Integer> set = new TreeSet<Integer>(); while(sum!=0) { int a = scan.nextInt(); set.add(a); sum--; }...
