Question

How to print all keys for specific value of multimap in C++

Answer 1

#include <iostream>  
#include <map>
#include <string>

using std::multimap;
using std::string;
using std::cout;
using std::endl;

int main()
{
	multimap<string, string> mm;

	mm.insert({ { "dog", "animal" },
	            { "cat", "animal" },
				{ "programmer", "smart animal" },
				{ "dog", "loyal" },
				{ "cat", "loyal" } });

	string word = ("loyal");
	cout << word << ": " << endl;
	for (const auto& element : mm) { 
		if (element.second == word) {
			cout << "     " << element.first << endl;
		}
	}

	return 0;
}

/*
run:

loyal:
	 cat
	 dog

*/

 

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