#include <iostream>
#include <fstream>
#include <string>
#include <hash_set>
using namespace std;
using namespace stdext;

int main()
{
    hash_set<string> hs;
    hash_set<string>::iterator it;

    ofstream out1("file1.txt");
    ofstream out2("file2.txt");
    out1<<"www.baidu.com"<<endl;
    out1<<"www.google.com"<<endl;
    out1<<"www.sina.com"<<endl;

    out2<<"www.baidu.com"<<endl;
    out2<<"www.yahoo.com"<<endl;
    
    ifstream in1("file1.txt");
    ifstream in2("file2.txt");
    string str1;
    string str2;
    while(getline(in2,str2))
    {
        hs.insert(str2);
    }
    while(getline(in1,str1))
    {
        if((it = hs.find(str1)) != hs.end ())
        {
            cout<<"find: "<<str1<<endl;
        }
    }
    system("pause");
    return 0;
}