Data Structures | Algorithms:CODING INTERVIEW 25Days of Code – Free Udemy Course
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Data Structures | Algorithms:CODING INTERVIEW 25Days of Code

Course Overview

CategoryDevelopment
Duration52.5
InstructorUdemy
LanguageEnglish
Rating4.5 / 5
PriceFree (was $84.99)

What You'll Learn

  • DAY 1: ArraysData Structures IntroductionBig ODS: Arrays Crash CourseQuestion 1: Sorted Squared ArrayQuestion 2: Monotonic Array
  • DAY 2: ArraysQuestion 1: Rotate ArrayQuestion 2:Container with most Water
  • DAY 3: Hash TableDS: Hash Tables Crash CourseQuestion 1: Two SumQuestion 2:Isomorphic Strings
  • DAY 4: RecursionQuestion 1: FibonacciQuestion 2:Power Sum
  • DAY 5: RecursionQuestion 1: PermutationsQuestion 2:Power Set
  • DAY 6: StringDS: Strings Crash CourseQuestion 1: Non repeating characterQuestion 2: Palindrome
  • DAY 7: StringQuestion 1: Longest Unique char Substring Question 2: Group Anagrams
  • DAY 8: SearchingQuestion 1: Binary SearchQuestion 2: Search in Rotated Sorted array
  • DAY 9: SearchingQuestion 1: Find First and Last Position of Element in Sorted ArrayQuestion 2: Search in 2D Array
  • DAY 10: SortingQuestion 1: Bubble SortQuestion 2: Insertion Sort

About This Free Course

Welcome to the Coding Interview Bootcamp!

Once you get an interview from a top tech company, the only thing that matters for you to get your dream Software Engineering role is your performance in the coding Interviews.

The only way to ace the coding interview is to take one problem at a time and really understand how to solve it and then do this for a lot of problems to get sufficient tools and techniques in your arsenal to face and conquer any coding interview. This is what my aim is for you with this course.

This course is structured as DAILY CODING CHALLENGES to give you a clear target for every day. By not missing a single day and by staying consistent you will have solved a variety of questions by the end of this course, getting you prepared for coding interviews and more practice on your own from Leetcode.

We start right from the basics and discuss Big O analysis and then move on to cover the common data structures algorithms interview preparation practice and then discuss real life problems asked in Big Tech companies such as Google, Meta, Amazon, Netflix, Apple, Microsoft etc.

For Each Question we discuss :

   1. The Logic or the method by which we can approach this question in an optimal manner

   2. The Time and Space complexity of the Solution

   3. Code the Solution in Javascript ( You can follow along in any coding language of your choice)

This course also includes multiple downloadable resources, trackers to keep you motivated, and cheat sheets to make your coding interview prep smooth.

COURSE OUTLINE

  • DAY 1: Arrays

Data Structures Introduction

Big O

DS: Arrays Crash Course

Question 1: Sorted Squared Array

Question 2: Monotonic Array

  • DAY 2: Arrays

  • Question 1: Rotate Array

    Question 2:Container with most Water

  • DAY 3: Hash Table

  • DS: Hash Tables Crash Course

    Question 1: Two Sum

    Question 2:Isomorphic Strings

  • DAY 4: Recursion

  • Question 1: Fibonacci

    Question 2:Power Sum

  • DAY 5: Recursion

  • Question 1: Permutations

    Question 2:Power Set

  • DAY 6: String

  • DS: Strings Crash Course

    Question 1: Non repeating character

    Question 2: Palindrome

  • DAY 7: String

  • Question 1: Longest Unique char Substring

    Question 2: Group Anagrams

  • DAY 8: Searching

  • Question 1: Binary Search

    Question 2: Search in Rotated Sorted array

  • DAY 9: Searching

  • Question 1: Find First and Last Position of Element in Sorted Array

    Question 2: Search in 2D Array

  • DAY 10: Sorting

  • Question 1: Bubble Sort

    Question 2: Insertion Sort

  • DAY 11: Sorting

  • Question 1: Selection Sort

    Question 2: Merge Sort

  • DAY 12: Sorting

  • Question 1: Quick Sort

    Question 2: Radix Sort

  • DAY 13: Singly Linked List

  • DS: Linked List Crash Course

    Question 1:  Construct SLL

    Question 2: delete duplicates

  • Day 14: Singly Linked List

  • Question 1:  Reverse SLL

    Question 2: Cycle Detection

  • DAY 15: Singly Linked List

  • Question 1: find duplicate number

    Question 2: Add 2 numbers

  • DAY 16: Doubly Linked List

  • Question 1: DLL remove insert

    Question 2: DLL remove all, insert at position

  • DAY 17: Stacks

  • DS: Stacks Crash Course

    Question 1:  Construct Stack

    Question 2: Reverse Polish Notation

  • DAY 18: Queues

  • DS: Queues Crash Course

    Question 1: Construct Queue

    Question 2: Implement Queue with Stack

  • DAY 19: Binary Tree and Binary Search Tree

  • DS: Binary Tree, Binary Search Tree Crash Course

    Question 1: Construct BST

    Question 2: Traverse BST (Breadth first and Depth first - Inorder, Preorder,Post order)

  • DAY 20: Binary Tree and Binary Search Tree

  • Question 1: Level Order traversal

    Question 2: Left/Right View of binary tree

  • DAY 21: Binary Tree and Binary Search Tree

  • Question 1: Invert Binary Tree

    Question 2: Diameter of binary tree

  • DAY 22: Binary Tree and Binary Search Tree

  • Question 1: Convert Sorted Array to Binary Search Tree

    Question 2: Validate BST

  • DAY 23: Heaps and Priority Queue

  • DS: Heaps Crash Course

    Question 2: min Priority Queue Construction

  • DAY 24: Graphs

  • DS: Graphs Crash Course

    Question 1:  BFS - Adj List and Adj Matrix

    Question 2: DFS - Iterative and Recursive

  • DAY 25: Graphs

  • Question 1: Number of connected components

    Question 2: Course Scheduler / Topological sort

    I'm sure you'll love this course and so we're offering a full money-back guarantee for 30 days in case you are not sure at the moment!

    Enroll today and see you inside the course !

    Let's make your dreams come true

    - Jackson

    Who Should Take This Course

    "Data Structures | Algorithms:CODING INTERVIEW 25Days of Code" is aimed at people who want a practical, structured introduction to development without paying full price for it. It's a solid fit if you're starting out in development and want a guided course rather than piecing tutorials together yourself, if you've tried free YouTube content on the topic and want something more organized in around 52.5, or if you already work in a related area and want a refresher you can finish at your own pace. Since enrollment happens on Udemy itself, you keep full access to view the lectures, download any provided resources, and revisit the material later — this isn't a stripped-down or time-limited version of the course.

    Why This Course Is Worth Taking

    Our take: this listing earns a spot on FreeWebCart because the coupon we verified actually brings the price to $0, not just a token discount, and the course carries a 4.5/5 rating on Udemy from 1+ students who've already enrolled. That combination — real reviews plus a working 100% OFF code — is what we look for before publishing a development course. It won't replace hands-on experience or a full degree program, but as a low-risk way to test whether development is worth pursuing further, or to pick up one specific skill, the free price tag makes it an easy yes while the coupon lasts.

    Pros & Cons

    👍 Pros

    • 100% free to enroll via this coupon (normally $84.99)
    • Lifetime access on Udemy once enrolled, even after the coupon expires
    • Rated 4.5/5 by past students on Udemy
    • Self-paced — no fixed schedule or live sessions to attend

    👎 Cons

    • Coupon is time-limited and can expire before you enroll
    • No live instructor support — questions go through Udemy's Q&A, not us
    • Certificate is a Udemy completion certificate, not an accredited qualification

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