题解 | #明明的随机数#

import java.util.Scanner;
import java.util.Iterator;
import java.util.TreeSet;
import java.util.ArrayList;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        TreeSet<Integer> integers = new TreeSet<>();
        ArrayList<Integer> integers1 = new ArrayList<>();
        Scanner scanner = new Scanner(System.in);
        //int i1 = scanner.nextInt();
        while (scanner.hasNext()){
            int i = scanner.nextInt();
            //System.out.println(i);
            integers1.add(i);
        }
        for (int i = 1; i < integers1.size(); i++) {
            integers.add(integers1.get(i));
        }
        Iterator<Integer> iterator = integers.iterator();
        while (iterator.hasNext()){
            System.out.println(iterator.next());
        }
    }
}