AI Practitioner

Data structures are fundamental concepts in computer science that help organize, manage, and store data efficiently. Two of the most basic and essential data structures are   Queue   and   Stack . This article provides an in-depth explanation of their characteristics, Python implementation from scratch, and examples using Python's built-in libraries. 1. Stack (LIFO - Last In, First Out) A  Stack  is a linear data structure that follows the  Last In, First Out (LIFO)  principle. This means the last element added to the stack is the first one to be removed. Characteristics of a Stack Insertion (push) and removal (pop) happen at the same end, called the  top  of the stack. Access to elements is restricted to the top of the stack only. Common operations: push(item) : Add an item to the top. pop() : Remove the top item. peek() : View the top item without removing it. is_empty() : Check if the stack is empty. Python Implementation (From Scratch) cl...