Question

How to merge between two int arrays into third array using set_union in C++

Answer 1

#include <iostream>
#include <algorithm>
#include <iterator>

using std::cout;
using std::endl;

#define SIZE 6

int main()
{
	int arr1[SIZE] = { 1, 3, 6, 7, 9, 12 };
	int arr2[SIZE] = { 1, 2, 3, 4, 5, 6 };

	std::ostream_iterator< int > output(cout, " ");

	int arr1arr2[SIZE * 2];

	int *p = std::set_union(arr1, arr1 + SIZE, arr2, arr2 + SIZE, arr1arr2);

	std::copy(arr1arr2, p, output);

	cout << endl;

	return 0;
}

/*
run:

1 2 3 4 5 6 7 9 12

*/

 

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