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What is a Stack?

Explore the fundamentals of stack data structures, their Last In First Out ordering, and key operations such as push and pop. Understand how stacks are used in programming tasks like undo functionality, recursion backtracking, and algorithm implementations to solve complex problems effectively.

Introduction

Everyone is familiar with the famous undo option, which exists in almost all popular applications. But have you ever wondered how that works? Well, store the previous states of your work (which are limited to a specific number) in the memory in such an order that the last one appears first. You can’t efficiently do this with simple arrays for reasons explored in the coming chapters. This is where the “stack” data structure ...