stl list algorithm

list push_back for_each merge unique 

#include <iostream>
#include <list>
#include <algorithm>

using namespace std;

void outString(string str)
{
	cout << str << " ";
}

int main()
{
	list <string> MetFriend;
	list <string> PatFriend;
	
	cout << "Hi, Met, please input your friend name:" << endl;
	MetFriend.push_back("msaidfa");
	MetFriend.push_back("mingming");
	MetFriend.push_back("123456");
	MetFriend.push_back("mingming3");
	MetFriend.push_back("a");
	MetFriend.sort();
	
	cout << "list MetFriend: ";
	for_each(MetFriend.begin(), MetFriend.end(), outString);
	cout << endl;
	
	cout << "Hi, Pat, please input your friend name:" << endl;
	PatFriend.push_back("msaidfa");
	PatFriend.push_back("b");
	PatFriend.push_back("c");
	PatFriend.push_back("4");
	PatFriend.sort();
	
	cout << "list PatFriend: ";
	for_each(PatFriend.begin(), PatFriend.end(), outString);	
	cout << endl;
	
	MetFriend.merge(PatFriend);
	
	MetFriend.unique();
	
	cout << "list Met and Pat Friend: ";
	for_each(MetFriend.begin(), MetFriend.end(), outString);
	cout << endl;
	
	return 0;
}