代码：

#include "iostream"
#include "windows.h"
#include "algorithm"
#include "vector"
#include "iterator"
#include "list"
#include "set"

using namespace std;

int main()
{
	int c1[]={1,2,2,4,6,7,7,9};
	int c2[]={2,2,2,3,6,6,8,9};
	
	int num1=sizeof(c1)/sizeof(int);
	int num2=sizeof(c2)/sizeof(int);

	cout<<"集合元素总数："<<endl;
	std::merge(c1,c1+num1,c2,c2+num2,std::ostream_iterator<int>(cout," "));
	cout<<endl;

	cout<<"除去重复的元素:"<<endl;
	std::set_union(c1,c1+num1,c2,c2+num2,std::ostream_iterator<int>(cout," "));
	cout<<endl;

	cout<<"交集："<<endl;
	std::set_intersection(c1,c1+num1,c2,c2+num2,std::ostream_iterator<int>(cout," "));
	cout<<endl;

	cout<<"差集:"<<endl;
	std::set_difference(c1,c1+num1,c2,c2+num2,std::ostream_iterator<int>(cout," "));
	cout<<endl;

	system("pause");
	return 0;
}