Stacks and Queues: From Basics to Monotonic Patterns

Stacks and queues are foundational data structures that play a critical role in many algorithmic solutions. They often appear in coding interviews, either directly as problems or as part of more complex problems. Understanding these structures and their applications, such as monotonic patterns, can be the key to solving interview questions efficiently. Before diving into stacks and queues, you sho

6 min read0 views0 helpful3/3/2026

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Prerequisites

Before diving into stacks and queues, you should be familiar with:

Basic data structures (arrays, linked lists)
Understanding of time and space complexity
Basic programming skills in Python or JavaScript
Familiarity with LeetCode-style problems

Introduction to Stacks and Queues

What is a Stack?

A stack is a collection of elements that follows the Last In, First Out (LIFO) principle. Imagine a stack of plates: you can only add or remove the top plate.

Basic Operations

Push: Add an element to the top.
Pop: Remove the top element.
Peek/Top: View the top element without removing it.
IsEmpty: Check if the stack is empty.

What is a Queue?

A queue is a collection of elements that follows the First In, First Out (FIFO) principl

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