#pragma once
#include <hash_map>
#include <iostream>
#include <fstream>
#include <string>
#include <set>

using namespace std;
using namespace stdext;
class CityGrouper
{
public:

	

    // this function should allow the user to load an input text file
    CityGrouper(string InputFileName);

	// this function should perform grouping and print the output
	void GroupCitiesByCountry(); 

	// other member functions and private data stores
private:
	
	set<string> countries;
	hash_multimap<string, string> country2city;

};