题解 | #集合#

import java.util.*;

// 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);
        int n = in.nextInt();
        int m = in.nextInt();
        TreeSet<Integer>  set = new TreeSet<>();
        while(n-- != 0) {
            set.add(in.nextInt());
        }
        int x;
        while(m!= 0) {
            x = in.nextInt();           
            set.add(x);
            
            m--;
        }
        for(int i : set) {
            System.out.print(i + " ");
        }
    }
}