俩个容器中的数据合并

#include<iostream>
#include<set>
#include<string>
using namespace std;

int main()
{
	string phone;
	set<string> A;
	set<string>::iterator p;
	for (int i = 0; i < 2; i++)
	{
		getline(cin, phone);
		while(phone!="end")
		{
			A.insert(phone);
			getline(cin, phone);
		}
	}
	p = A.begin();
	while (p != A.end())
		cout << *p++ << endl;
	return 0;

}