Tree
tree

The Sliding Window
array sliding-window

Doubly Linked list
doubly-linked-list

Array - Two pointers
two-pointers array area of rectangle

LRU Cache
lru cache deque

Summary of Data Structures Easy to Advanced Course
data structures

Stack
stack data structure

Queue
queues data structure

Linked list
linked list data structure

Is Valid Parentheses (Challenge)
stacks queues challenge

Hash Maps
dictionaries python hash map