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🚀 The LeetCode Pattern Playbook

Stop Solving LeetCode Randomly. Start Solving by Pattern.

Built by an IITian & Amazon Alumnus. Designed to Help You Crack Top Tech Interviews.

Master the most important DSA patterns used in coding interviews—and learn how to recognize the right approach before you start coding.

₹499₹199

One-time payment • Instant digital access

Get the LeetCode Pattern Book →
See What's Inside ↓
✓ Interview-focused✓ Beginner-friendly✓ Pattern-based✓ Instant digital access
Two Pointers
Sliding Window
HashMap
Binary Search
Stack
Linked List
Trees
Graphs
Dynamic Programming
The Transformation

Before vs After: The Pattern Shift

See the difference between random practice and pattern-based preparation.

BEFORE
  • ❌ Random LeetCode questions
  • ❌ Guessing the approach
  • ❌ Getting stuck
  • ❌ Looking at solutions
  • ❌ Forgetting the approach
  • ❌ Solving problem in 30-40 mins 
AFTER
  • ✓ 45 pattern - 150 + List of pattern wise problems 
  • ✓ Recognize pattern
  • ✓ Choose data structure
  • ✓ Apply known framework
  • ✓ Code confidently
  • ✓ Solve problem in 10 mins

Built from real interview preparation experience

13+ Years

Industry Experience

2000+

Students Trained

150+

Pattern wise problem list

Interview

Focused Approach
Google
Amazon
Microsoft
Meta
Flipkart

Reference companies where candidates using this approach have interviewed. Not affiliated with or endorsed by these companies.

If LeetCode Feels Random, You're Missing the Pattern.

The problem isn't that you haven't solved enough questions. The problem is that you haven't learned how to recognize the underlying pattern.

🎲
01

Random Practice

Solving question after question without understanding how they connect.

🧩
02

Pattern Blindness

You understand a solution after seeing it, but struggle to identify the approach yourself.

⏱️
03

Interview Pressure

You know DSA concepts but freeze when you're given an unfamiliar problem.

This book changes the way you approach LeetCode.

The Pattern Framework

Stop Memorizing Solutions. Learn the Framework.

Every LeetCode problem can be broken down using this proven framework. Master it once, and you have a system that works for any problem.

STEP 01

Understand

Read problem carefully

STEP 02

Check Constraints

Analyze inputs, edge cases

STEP 03

Identify Pattern

Match to known pattern

STEP 04

Choose Data Structure

Select the right tool

STEP 05

Build Algorithm

Outline the steps

STEP 06

Code

Implement solution

STEP 07

Analyze Complexity

Time & space check

What's Inside the Book

199 Patterns. 8 Categories. One Complete Framework.

A premium pattern reference you can revisit while preparing—covering the patterns that actually show up in coding interviews.

Arrays

20+ patterns
  • Two Pointers
  • Sliding Window
  • Prefix Sum
  • Kadane's Algorithm
  • Sorting + Greedy

Hashing

18+ patterns
  • Frequency Map
  • HashSet
  • Complement Map
  • Prefix Sum + HashMap
  • HashMap + Sliding Window

Stack & Queue

15+ patterns
  • Monotonic Stack
  • Next Greater Element
  • Parentheses
  • Queue Patterns

Linked List

18+ patterns
  • Fast & Slow Pointer
  • Reverse Linked List
  • Merge Lists
  • Cycle Detection

Binary Search

16+ patterns
  • Classic Binary Search
  • Boundary Search
  • Rotated Array
  • Search on Answer

Trees

22+ patterns
  • DFS
  • BFS
  • Tree Recursion
  • Binary Search Tree

Graphs

24+ patterns
  • BFS
  • DFS
  • Topological Sort
  • Union Find
  • Shortest Path

Dynamic Programming

26+ patterns
  • 1D DP
  • 2D DP
  • Knapsack
  • Subsequence DP
  • Grid DP
Inside Look

Here's How You'll Learn Each Pattern

Every pattern in the book follows a consistent structure—so you know exactly when to use it, how to think about it, and how to code it.

PATTERN #07

Sliding Window

When to use it
Contiguous subarrays or substrings.
Example Problem
Longest Substring Without Repeating Characters
Mental Model
Expand the window → maintain validity → shrink when necessary.
Complexity
Time: O(N)Space: O(N)
Get the Complete Pattern Book →
sliding_window.py# Pattern: Sliding Windowdeflength_of_longest_substring(s):char_index = {}left = 0max_len = 0 forright, chinenumerate(s):ifchinchar_index:left = max(left,char_index[ch] + 1)char_index[ch] = rightmax_len = max(max_len,right - left + 1) returnmax_len# expand → shrink → track
Who It's For

Built For Engineers Who Want to Get Interview Ready

If any of these describe you, this book was written with you in mind.

Students

Preparing for product-company interviews.

Working Professionals

Trying to move into better software engineering roles.

Experienced Engineers

Preparing for senior-level coding interviews.

LeetCode Learners

Already practicing but struggling with consistency and pattern recognition.

Engineers Using Patterns to Prepare Smarter

Engineers Are Using Patterns to Prepare Smarter.

Here's what software engineers have shared about shifting from random practice to pattern-based preparation.

★★★★★

"The biggest change was that I stopped looking at every LeetCode problem as a completely new problem. Once I understood the patterns, solving became much easier and faster."

AR
Aarav R.
SDE-1 • Bengaluru
★★★★★

"I had solved 300+ problems but still blanked out in interviews. The pattern-based approach finally clicked — I could recognize the approach within the first 2 minutes of reading a problem."

PS
Priya S.
SDE-2 • Hyderabad
★★★★★

"Worth way more than ₹199. The templates alone saved me weeks of figuring out how to structure my solutions. The complexity analysis at the end of each pattern is gold."

VK
Vikram K.
Software Engineer • Pune
★★★★★

"As someone switching from a service-based company, this was exactly what I needed. I could finally understand why a problem needs a HashMap vs a Sliding Window — that clarity changed everything."

NM
Neha M.
Career Switcher • Noida
★★★★★

"I went into my Google interview feeling calm because I had a framework to fall back on. Even when the problem was new to me, I knew how to break it down. Cleared the round."

RJ
Rohan J.
SDE-1 • Gurgaon
★★★★★

"The 'when to use' section for each pattern is what makes this different. It's not just a list of problems — it teaches you to think in patterns. Best ₹199 I've spent this year."

SD
Sneha D.
Final Year CS • IIT
bij_uxmte_960
Meet the Author

Bijaya Bhatta

Software Engineer | Tech Lead | DSA & System Design Mentor

13+ Years
Industry Experience
1000+
Students Trained
IIT Delhi
Algorithms Research

I've spent years working in software engineering and helping developers prepare for technical interviews. I created this book to simplify one of the biggest challenges candidates face — knowing which approach to use when they see a new coding problem. Instead of memorizing hundreds of random solutions, this book teaches you the 199 patterns that connect them all.

Get the Pattern Book →
Everything You Get

Everything You Get for ₹199

No upsells. No hidden charges. Just a complete, interview-focused reference you can start using today.

📘 199 LeetCode & DSA Patterns

Value: ₹499 • Yours today for just ₹199

  • ✓Pattern explanationsIncluded
  • ✓When-to-use frameworkIncluded
  • ✓Common problem typesIncluded
  • ✓Interview examplesIncluded
  • ✓Complexity analysisIncluded
  • ✓Coding templatesIncluded
  • ✓Pattern recognition techniquesIncluded
Launch Price
Get Instant Access — ₹199 →

One-time payment • No subscription • No hidden fees

Stop Solving Randomly. Start Solving by Pattern.

Learn the patterns that help you approach LeetCode problems with clarity and confidence. For less than the cost of a meal out.

₹499

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Frequently Asked Questions

Got Questions? We've Got Answers.

Everything you need to know before grabbing your copy.

Is this suitable for beginners? +
Yes — this book is built to be beginner-friendly. Each pattern is explained from first principles, with clear "when to use" guidance, sample problems, and complexity analysis. If you're just starting out with DSA, the book gives you a structured framework to follow instead of getting lost in random problems.
How many patterns are covered? +
The book covers 199 carefully curated patterns across 8 categories — Arrays, Hashing, Stack & Queue, Linked List, Binary Search, Trees, Graphs, and Dynamic Programming. These are the patterns that actually show up in real coding interviews — not every obscure variation.
Is this a digital book? +
Yes, this is a digital book delivered as a PDF. You'll get instant access after purchase and can read it on any device — phone, tablet, laptop, or desktop. You can also print specific sections if you prefer studying from paper.
How do I receive the book? +
After successful payment, you'll receive an instant email with a secure download link for the PDF. You'll also get access instructions on the confirmation page. The entire process takes under a minute.
Is the payment one-time? +
Yes — this is a one-time payment of ₹199. No subscriptions, no recurring charges, no hidden fees. You pay once and own the book forever.
Can I use this for coding interview preparation? +
Absolutely — that was the entire purpose of writing it. Every pattern in the book is one that comes up in real coding interviews. The "when to use" guidance is designed to help you recognize these patterns quickly under interview pressure.
Is this useful for experienced developers? +
Yes. Experienced engineers often struggle with pattern recognition too — especially when switching back into interview mode after years of working on production code. The pattern-based framework helps you refresh efficiently and prepare for senior-level interviews.
Does the book include LeetCode problems? +
The book references classic problems that exemplify each pattern — including problems commonly found on LeetCode and in real interviews. The focus is on teaching you to recognize the underlying pattern so you can solve variations and new problems on your own.
What programming language is used? +
The patterns are language-agnostic — the same pattern works in any language. Code examples in the book are primarily in Python for clarity, but if you're comfortable in Java, C++, JavaScript, or any other language, you can apply the patterns immediately.

Stop Solving Randomly.
Start Solving by Pattern.

Learn the patterns that help you approach LeetCode problems with clarity and confidence.

₹199

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199 LeetCode Patterns₹199 • One-time payment
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