一、题目描述

二、解题思路

做两个bool类型哈希表记录即可，初始化为false，到时候遍历为真的数组元素，输出下标

#include <algorithm>
#include <iostream>
#include <vector>
using namespace std;
int main()
{
   

    unsigned int N1, N2;
    vector<bool> Hash1(1001, false);
    vector<bool> Hash2(1001, false);
    cin >> N1;
    unsigned int tmp;
    for (unsigned int i = 0; i < N1; i++)
    {
   
        cin >> tmp;
        Hash1[tmp] = true;
    }
    cin >> N2;
    for (unsigned int i = 0; i < N2; i++)
    {
   
        cin >> tmp;
        Hash2[tmp] = true;
    }
    for (unsigned int i = 0; i < 1001; i++)
    {
   
        if (Hash1[i] == true)
            cout << i << endl;
    }
    for (unsigned int i = 0; i < 1001; i++)
    {
   
        if (Hash2[i] == true)
            cout << i << endl;
    }
    return 0;
}

三、运行结果