HomeCoursesData Structures for Coding Interviews in C#

4.4

Beginner

35h

Data Structures for Coding Interviews in C#

The ultimate guide to data structures for coding interviews in C#. Developed by FAANG engineers, learn implementations and strategies to write efficient, interview-ready code.

Join 2.7 million developers at

Pick a Language

C++

Java

JavaScript

Python

Pick a Language

C#

Overview

Content

Reviews

Related

Data structures are amongst the very fundamentals of computer science. They are often a core decision in developing efficient programs. Consequently, they are also largely categorized as a vital benchmark of computer science knowledge when it comes to industry interviews. This course contains a detailed review of all the common data structures, and it also provides implementation level details in C# to help readers become well equipped with different data structures that they can leverage to write better code!

Data structures are amongst the very fundamentals of computer science. They are often a core decision in developing efficient pr...Show More

TAKEAWAY SKILLS

C#

Programming Language

Prepare for Interview

Data Structures

Time Complexity

Content

219 Lessons24 Quizzes61 Challenges

1.

Introduction to Complexity Measures

22 Lessons

Learn how to use complexity measures like Big O for analyzing algorithm efficiency.

Comparing Algorithms

Example 1: Measuring Time Complexity of a Single Loop Algorithm

Example 2: Time Complexity of an Algorithm With Nested Loops

Introduction to Asymptotic Analysis and Big O

Other Common Asymptotic Notations and Why Big O Trumps Them

Useful Formulae

Common Complexity Scenarios

Challenge 1: Big (O) of Nested Loop with Addition

Solution Review: Big (O) of Nested Loop with Addition

Challenge 2: Big (O) of Nested Loop with Subtraction

Solution Review: Big (O) of Nested Loop with Subtraction

Challenge 3: Big (O) of Nested Loop with Multiplication

Solution Review: Big (O) of Nested Loop with Multiplication

Challenge 4: Nested Loop with Multiplication (Basic)

Solution Review: Nested Loop with Multiplication (Basic)

Challenge 5: Nested Loop with Multiplication (Intermediate)

Solution Review: Nested Loop with Multiplication (Intermediate)

Challenge 6: Nested Loop with Multiplication (Advanced)

Solution Review: Nested Loop with Multiplication (Advanced)

Challenge 7: Nested Loop with Multiplication (Pro)

Solution Review: Nested Loop with Multiplication (Pro)

Complexity Quiz: Test your understanding of Complexity

2.

Introduction to Arrays

25 Lessons

Grasp the fundamentals of arrays and multidimensional arrays with coding challenges and solutions.

What is an Array?

Multidimensional Arrays

Challenge 1: Remove Even Integers From an Array

Solution Review: Remove Even Integers From an Array

Challenge 2: Merge Two Sorted Arrays

Solution Review: Merge Two Sorted Arrays

Challenge 3: Find Two Numbers that Add Up to Given Value

Solution Review: Find Two Numbers that Add Up to the Given Value

Challenge 4: Array of Products of all Elements

Solution Review: Array of Products of All Elements

Challenge 5: Finding Minimum Value in an Array

Solution Review: Finding Minimum Value in an Array

Challenge 6: Finding the First Unique Integer in an Array

Solution Review: Finding the First Unique Integer in an Array

Challenge 7: Finding the Second Maximum Value in an Array

Solution Review: Finding the Second Maximum Value in an Array

Challenge 8: Right Rotate an Array by One

Solution Review: Right Rotate an Array by One

Challenge 9: Rearrange Positive & Negative Values

Solution Review : Rearrange Positive & Negative Values

Challenge 10: Rearrange Sorted Array in Max/Min Form

Solution Review: Rearrange Sorted Array in Max/Min Form

Challenge 11: Maximum Sum Subarray

Solution Review: Maximum Sum Subarray

Arrays Quiz: Test Your Understanding of Arrays

3.

Introduction to Linked Lists

28 Lessons

Master the steps to efficiently manipulate linked lists, including operations, challenges, and solutions.

Singly Linked Lists (SLL)

Basic Linked List Operations

Singly Linked List Insertion

Challenge 1: Insertion at Tail

Solution Review: Insertion at Tail

Challenge 2: Search in a Singly Linked List

Solution Review: Search in a Singly Linked List

Deletion in a Singly Linked List

Challenge 3: Deletion by Value

Solution Review: Deletion by Value

Linked Lists vs. Arrays

Challenge 4: Find the Length of a Linked List

Solution Review: Finding the Length of a Linked List

Challenge 5: Reverse a Linked List

Solution Review: Reverse a Linked List

Challenge 6: Detect Loop in a Linked List

Solution Review: Detect a Loop in a Linked List

Challenge 7: Find Middle Node of Linked List

Solution Review: Find Middle Node of a Linked List

Challenge 8: Remove Duplicates from Linked List

Solution Review: Remove Duplicates From a Linked List

Challenge 9: Union and Intersection of Linked Lists

Solution Review: Union and Intersection of Linked Lists

Challenge 10: Return the Nth Node From End

Solution Review: Return the Nth Node From The End

Doubly Linked Lists (DLL)

Singly Linked Lists vs. Doubly Linked Lists

Linked Lists Quiz: Test Your Understanding of Linked Lists

4.

Introduction to Stack/Queues

23 Lessons

Grasp the fundamentals of stack and queue data structures, their implementations, and common challenges.

What is a Stack?

Stack (Implementation)

What is a Queue?

Queue (Implementation)

Challenge 1: Generate Binary Numbers From 1 to N Using Queue

Solution Review: Generate Binary Numbers From 1 to N Using Queue

Challenge 2: Implement Two Stacks Using One Array

Solution Review: Implement Two Stacks Using One Array

Challenge 3: Reversing First "k" Elements of Queue

Solution Review: Reversing First "k" Elements of Queue

Challenge 4: Implement a Queue Using Stacks

Solution Review: Implement a Queue Using Stacks

Challenge 5: Sort Values in a Stack

Solution Review: Sort Values in Stack

Challenge 6: Evaluate Postfix Expression Using a Stack

Solution Review: Evaluate Postfix Expression Using a Stack

Challenge 7: Next Greater Element Using a Stack

Solution Review: Next Greater Element Using a Stack

Challenge 8: Check Balanced Parentheses Using Stack

Solution Review: Check Balanced Parentheses Using Stack

Challenge 9: min() Function Using a Stack

Solution Review: min() Function Using a Stack

Stack/Queue Quiz: Test Your Understanding of Stack/Queue

5.

Introduction to Graphs

26 Lessons

Deepen your knowledge of graph concepts, types, representations, implementations, and key algorithms.

What is a Graph?

Types of Graphs

Representation of Graphs

Graph Implementation

Complexities of Graph Operations

What is a Bipartite Graph?

Graph Traversal Algorithms

Challenge 1: Implement Breadth First Search

Solution Review: Implement Breadth First Search

Challenge 2: Implement Depth First Search

Solution Review: Implement Depth First Search

Challenge 3: Detect Cycle in Graph

Solution Review: Detect Cycle in Graph

Challenge 4: Find a "Mother Vertex" in a Graph

Solution Review: Find a "Mother Vertex" in a Graph

Challenge 5: Count the Number of Edges in an Undirected Graph

Solution Review: Count the Number of Edges in an Undirected Graph

Challenge 6: Check if a Path Exists Between Two Vertices

Solution Review: Check if a Path Exists Between Two Vertices

Challenge 7: Check if an Undirected Graph is Tree or Not

Solution Review: Check if an Undirected Graph is a Tree or Not

Challenge 8: Find the Shortest Path Between Two Vertices

Solution Review: Find the Shortest Path Between Two Vertices

Challenge 9: Remove Edge

Solution Review: Remove Edge

Graph Quiz: Test your Understanding of Graphs

6.

Introduction to Trees

38 Lessons

Follow the process of understanding tree structures, from basics to complex operations.

An Introduction to Trees and Basic Tree Properties

What is a Binary Tree?

What Makes a Tree Balanced?

More on Complete Binary Trees

Skewed Binary Trees

What is a Binary Search Tree (BST)?

Implementing a Binary Search Tree in C#

Binary Search Tree Insertion

Binary Search Tree Insertion (Implementation)

Searching in a Binary Search Tree (Implementation)

Deletion in Binary Search Tree

Deletion in Binary Search Tree (Implementation)

Pre-Order Traversal

Post-Order Traversal

In-Order Traversal

What is an AVL Tree?

What is a Red-Black Tree?

Red-Black Tree Insertion

Red-Black Tree Deletion

What are 2-3 Trees?

2-3 Deletion (Case #1)

2-3 Deletion (Case #2)

Overview of Trees

Challenge 1: Finding Minimum Value in a Binary Search Tree

Solution Review: Finding Minimum Value in a Binary Search Tree

Challenge 2: Finding kth Maximum Value in Binary Search Tree

Solution Review: Finding Kth Maximum Value in Binary Search Tree

Challenge 3: Finding Ancestors of a Given Node in a BST

Solution Review: Finding Ancestors of a Given Node in a BST

Challenge 4: Finding the Height of a Binary Tree

Solution Review: Finding the Height of a Binary Tree

Challenge 5: Finding Nodes at "k" Distance From the Root

Solution Review: Finding Nodes at "k" Distance From the Root

Trees Quiz: Test Your Understanding of Trees

7.

Trie

14 Lessons

Master the steps to using Tries for efficient string storage, retrieval, and manipulation in C#.

What is a Trie?

Structure of a Trie

Insertion in a Trie

Search in a Trie

Deletion in a Trie

Challenge 1: Total Number of Words in a Trie

Solution Review: Total Number of Words in a Trie

Challenge 2: Find All Words Stored in Trie

Solution Review: Finding All Words Stored in Trie

Challenge 3: List Sort Using Tries

Solution Review: List Sort Using Tries

Challenge 4: Word Formation From a Vector Using Trie

Solution Review: Word Formation From a Vector Using a Trie

Trie Quiz: Test Your Understanding of Tries

8.

Introduction to Heap

12 Lessons

Learn how to use heaps for efficient data management and priority-based algorithms.

What is a Heap?

Max Heap: Introduction

Max Heap (Implementation)

Min Heap: Introduction

Min Heap (Implementation)

Challenge 1: Convert Max-Heap to Min-Heap

Solution Review: Convert Max-Heap to Min-Heap

Challenge 2: Finding “k” Smallest Elements in the Array

Solution Review: Finding “K” Smallest Elements in the Array

Challenge 3: Finding “K” Largest Elements in the Array

Solution Review: Finding “K” Largest Elements in the Array

Heap Quiz: Test Your Understanding of Heaps

9.

Introduction to Hashing

29 Lessons

Grasp the fundamentals of hash tables, their functions, and collision handling in C#.

What is a Hash Table?

The Hash Function

Collisions in Hash Tables

Building a Hash Table from Scratch

Add/Remove & Search in Hash Table (Implementation)

A Quick Overview of Hash Tables

Trie vs. Hash Table

HashTable vs. Dictionary vs. HashSet

Challenge 1: An Array as a Subset of Another Array

Solution Review: An Array as a Subset of Another Array

Challenge 2: Check if Arrays are Disjoint

Solution Review: Check if Arrays are Disjoint

Challenge 3: Find Symmetric Pairs in an Array

Solution Review: Find Symmetric Pairs in an Array

Challenge 4: Trace the Complete Path of a Journey

Solution Review: Trace the Complete Path of a Journey

Challenge 5: Find Two Pairs in an Array with an Equal Sum

Solution Review: Find Two Pairs in an Array with an Equal Sum

Challenge 6: A Subarray with a Sum of 0

Solution Review: A Subarray with a Sum of 0

Challenge 7: Find First Unique Integer in an Array

Solution Review: Find First Unique Integer in an Array

Challenge 8: Remove Duplicates From Linked List Using Hashing

Solution Review: Remove Duplicates From Linked List Using Hashing

Challenge 9: Union and Intersection of Lists Using Hashing

Solution Review: Union and Intersection of Lists Using Hashing

Challenge 10: Find Two Numbers that Add Up to "Value"

Solution Review: Find Two Numbers that Add Up to "Value"

Hashing Quiz: Test Your Understanding of Hashing

10.

Summary of Data Structures

2 Lessons

Break apart the differences between linear and non-linear data structures.

Overview of Linear and Non-Linear Data Structures

Certificate of Completion

Showcase your accomplishment by sharing your certificate of completion.

Course Author:

Mohammad Chowdhury

Developed by MAANG Engineers

Every Educative lesson is designed by our in-house team of ex-MAANG software engineers and PhD computer science educators, and developed in consultation with developers and data scientists working at Meta, Google, and more. Our mission is to get you hands-on with the necessary skills to stay ahead in a constantly changing industry. No video, no fluff. Just interactive, project-based learning with personalized feedback that adapts to your goals and experience.

Trusted by 2.7 million developers working at companies

"These are high-quality courses. Trust me. I own around 10 and the price is worth it for the content quality. EducativeInc came at the right time in my career. I'm understanding topics better than with any book or online video tutorial I've done. Truly made for developers. Thanks"

Anthony Walker

@_webarchitect_

"Just finished my first full #ML course: Machine learning for Software Engineers from Educative, Inc. ... Highly recommend!"

Evan Dunbar

ML Engineer

"You guys are the gold standard of crash-courses... Narrow enough that it doesn't need years of study or a full blown book to get the gist, but broad enough that an afternoon of Googling doesn't cut it."

Software Developer

Carlos Matias La Borde

"I spend my days and nights on Educative. It is indispensable. It is such a unique and reader-friendly site"

Souvik Kundu

Front-end Developer

"Your courses are simply awesome, the depth they go into and the breadth of coverage is so good that I don't have to refer to 10 different websites looking for interview topics and content."

Vinay Krishnaiah

Software Developer

Hands-on Learning Powered by AI

See how Educative uses AI to make your learning more immersive than ever before.

Personalized Interview Prep

Skip the LeetCode grind with a custom roadmap that adapts to your goals. Hands-on practice for Coding Interviews, System Design, and more.

Mock Interviews

Test your skills in a simulated interview setting. Receive personalized feedback based on your performance. Available for Coding Interviews, System Design, and more.

AI Prompt

Build prompt engineering skills. Practice implementing AI-informed solutions.

Code Feedback

Evaluate and debug your code with the click of a button. Get real-time feedback on test cases, including time and space complexity of your solutions.

Explain with AI

Select any text within any Educative course, and get an instant explanation — without ever leaving your browser.

AI Code Mentor

AI Code Mentor helps you quickly identify errors in your code, learn from your mistakes, and nudge you in the right direction — just like a 1:1 tutor!

Course

Data Structures for Coding Interviews in C++

Data Structures for Coding Interviews in C++

The ultimate guide to data structures for coding interviews. Developed by FAANG engineers. Get interview-ready in hours with C++ implementations and real-world interview questions. Prep faster.

beginner

Course

C# for Programmers: A Practical Guide

C# for Programmers: A Practical Guide

Gain insights into fundamental and advanced C# programming concepts. Learn about conditional statements, loops, methods, arrays, classes, inheritance, interfaces, and delegates through practical challenges.

beginner

Course

Data Structures for Coding Interviews in JavaScript

Data Structures for Coding Interviews in JavaScript

The ultimate guide to data structures for coding interviews in JavaScript. Developed by FAANG engineers to help you write better code and ace industry benchmarks.

beginner

Course

Introduction to Master Pages in ASP.NET

Introduction to Master Pages in ASP.NET

beginner

Course

Learn Intermediate Python 3

Learn Intermediate Python 3

Gain insights into Python 3 by exploring fundamental and advanced concepts. Learn about functions, data structures, and OOP while reinforcing knowledge with quizzes and coding challenges.

beginner

Course

C# Concurrency for Senior Engineering Interviews

C# Concurrency for Senior Engineering Interviews

The ultimate guide to C# concurrency interviews. Developed by FAANG engineers, it covers multithreading, Monitors, Deferred Callbacks, and solutions to Reader-Writer, Dining Philosopher Problems.

beginner

Course

Data Structures in JavaScript: Visualizations & Exercises

Data Structures in JavaScript: Visualizations & Exercises

Discover Data Structures in JavaScript with step-by-step visualizations and interactive exercises. Gain insights into arrays, stacks, queues, dictionaries, sets, hash tables, linked lists, binary trees, and graphs.

beginner

Data Structures for Coding Interviews in C++

C# for Programmers: A Practical Guide

Data Structures for Coding Interviews in JavaScript

Introduction to Master Pages in ASP.NET

Learn Intermediate Python 3

C# Concurrency for Senior Engineering Interviews

Data Structures in JavaScript: Visualizations & Exercises

Free Resources

Learn in-demand tech skills in half the time

Copyright ©2025 Educative, Inc. All rights reserved.

soc2