#include <iostream>
#include <vector>
#include <algorithm>
 
int main()
{
	std::vector<int> in_a = {1, 2, 2, 3};
	std::vector<int> in_b = {2, 2, 4, 5};
 
	std::vector<int> out_a;
	std::vector<int> out_b;
 
	std::set_union(in_a.begin(), in_a.end(), in_b.begin(), in_b.end(), std::back_inserter(out_a));
	std::merge(in_a.begin(), in_a.end(), in_b.begin(), in_b.end(), std::back_inserter(out_b));
 
	for (const auto& item : out_a)
	{
		std::cout << item << " ";
	}
	std::cout << std::endl;
 
	for (const auto& item : out_b)
	{
		std::cout << item << " ";
	}
	std::cout << std::endl;
 
	return 0;
}

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