Introduction
After sequential containers, let's enter the world of associative containers and learn about the principle of key-value pairs.
We'll cover the following...
C++ has eight different associative containers. Four of them are associative containers with sorted keys: std::set, std::map, std::multiset, and std::multimap. The other four are associative containers with unsorted keys: std::unordered_set, std::unordered_map, std::unordered_multiset, and std::unordered_multimap ...