题解 | #整型数组合并#

import java.util.*;
import java.io.*;

public class Main{
    public static void main(String [] args) throws Exception{
        BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
        int a= Integer.parseInt(bf.readLine());
        String [] arr_a = bf.readLine().split(" ");
        int b= Integer.parseInt(bf.readLine());
        String [] arr_b = bf.readLine().split(" ");
        int [] all = new int[a+b];
        for(int i=0; i<a+b;i++){
            if(i<a){
                all[i]=Integer.parseInt(arr_a[i]);
            }else{
                all[i]=Integer.parseInt(arr_b[i-a]);
            }
        }
        Arrays.sort(all);
        StringBuilder sb = new StringBuilder();
        for(int i=0; i<a+b;i++){
            if (i>0 && all[i-1] ==all[i]){
                continue;
            }
            sb.append(all[i]);
        }
        System.out.println(sb);
    }
}