题解 | #明明的随机数#

import java.util.Scanner;
import java.util.List;
import java.util.ArrayList;
import java.util.Collections;

// 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) {
        Scanner in = new Scanner(System.in);
        List<Integer> first = new ArrayList<>();
        List<Integer> ken = new ArrayList<>();
        List<Integer> inken = new ArrayList<>();
        while (in.hasNext()) {
            int a = in.nextInt();
            if (first.size() == 0) {
                first.add(a);
                continue;
            }
            if (inken.contains(a)) {
                ken.add(a);
                continue;
            }
            if (inken.size() <= first.get(0)) {
                inken.add(a);
            }
        }
        Collections.sort(inken);
        for (Integer i : inken) {
            System.out.println(i);
        }
    }
}