Introduction to Stack
Explore what a stack is and how it enforces last in, first out (LIFO) order. Understand key operations like push, pop, and peek, and discover real-world applications such as undo features, method call tracking, and browser navigation. This lesson helps you grasp the fundamentals of stacks and their role in efficient problem-solving.
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Arrays and linked lists are flexible structures. We can access, insert, or remove elements at any position. That flexibility is useful, but it also means neither structure enforces a rule about the order in which elements are processed. For specific categories of problems, such as tracking method calls, undoing operations, or parsing nested structures, we often need the most recently added item handled first.
This is a primary use case for stacks. A stack enforces last in, first out (LIFO) ordering, which is well suited for scenarios where the most recent item is processed first.
What is a stack?
A stack is a linear data structure that stores elements in a particular order. It follows the last in, first out (LIFO) principle. This means that the most recently added element is the first one to be removed. ... ...