[C++] multimap 값 가져오기

#include <iostream>
#include <map>

using namespace std;

int main()
{
	multimap<int, int> a;
	a.insert(pair<int, int>(1, 2));
	a.insert(pair<int, int>(1, 2));
	a.insert(pair<int, int>(2, 4));

	cout << "모든 값을 가져오기 " << endl;

	for (multimap<int, int>::iterator it = a.begin(); it != a.end(); ++it)
		cout << it->first << "\t" << it->second << endl;

	cout << "\n특정 키(2)에 대한 값을 가져오기 " << endl;
	auto range = a.equal_range(2);

	for (auto it = range.first; it != range.second; it++)
		cout << it->first << "\t" << it->second << endl;
}