multimap遍历与查找

    std::multimap<int, std::string> m;
	m.insert(std::make_pair(0, "w0"));
	m.insert(std::make_pair(1, "w1"));
	m.insert(std::make_pair(1, "w11"));
	m.insert(std::make_pair(2, "w2")); 

	for (std::multimap<int, std::string>::iterator it = m.begin(); it != m.end(); it++)
	{
		printf("%d - %s\n", it->first, it->second.c_str());
	} 

	std::multimap<int, std::string>::iterator fit = m.find(1); //just first one that key = 1

	std::pair<std::multimap<int, std::string>::iterator, std::multimap<int, std::string>::iterator> pr = m.equal_range(1); //all that key = 1
	std::multimap<int, std::string>::iterator pit = pr.first;
	while (pit != pr.second)
	{
		printf("%d - %s\n", pit->first, pit->second.c_str());
		pit++;
	}

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