Exploring stacks, queues, and their variations like deques, priority queues, and applications like the LRU Cache.
Implementing stacks and understanding their LIFO (Last-In, First-Out) behavior.
Using stacks to convert expressions between infix, prefix, and postfix notations.
Applying the monotonic stack pattern to problems like 'Next Greater Element'.
Understanding FIFO queues and double-ended queues (Deques).
Implementing and using priority queues, often with a heap.
Designing and implementing a Least Recently Used (LRU) Cache.