Question

How to merge between two vectors using set_union in C++

Answer 1

#include <iostream>
#include <algorithm>
#include <iterator>
#include <vector>
#include <string>

using std::cout;
using std::endl;
using std::string;
using std::vector;

int main()
{
	string s1("abcdefg");
	string s2("befghijk");

	vector<char> vec1(s1.begin(), s1.end());
	vector<char> vec2(s2.begin(), s2.end());

	vector<char> vec1vec2;
	set_union(vec1.begin(), vec1.end(), vec2.begin(), vec2.end(), back_inserter(vec1vec2));

	copy(vec1vec2.cbegin(), vec1vec2.cend(), std::ostream_iterator<char>(cout, " "));

	cout << endl;

	return 0;
}

/*
run:

a b c d e f g h i j k

*/

 

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