ordered_map

Ordered_map is a data structure that combines the properties of a map and a list. It is an associative container that stores elements in a sorted order according to a comparison function. This data structure allows efficient search, insertion, and deletion operations by using a binary search tree as its underlying data structure. It provides the same interface as the standard map, but it also maintains a list of elements in insertion order, which can be accessed using iterators. The ordered_map