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I find that both set and map are implemented as a tree. set is a binary search tree, map is a self-balancing binary search tree, such as red-black tree? I am confused about the difference about the implementation. The difference I can image are as follow
1) element in set has only one value(key), element in map has two values.
2) set is used to store and fetch elements by itself. map is used to store and fetch elements via key.
What else are important?
Maps and sets have almost identical behavior and it’s common for the implementation to use the exact same underlying technique.
The only important difference is map doesn’t use the whole value_type to compare, just the key part of it.