Best DSA Warm-up Course (DSA + OA + CP) in India
Comprehensive Data Structures & Algorithms Structured Course by
Kumar K (SDE @ Amazon)
Meet Your Mentor
Kumar K (Karan Kumar)
SDE @ Amazon
2100+ rated on LeetCode (Top 1% in world)
YouTube & LinkedIn (1 Lakh+ followers)
All India Rank 12 in CodeJam and World Rank 360 in KickStart
All India Rank 15 out of 200,000
All India Rank 26 in LeetCode Weekly Contest
From Tier-4 College to Amazon SDE (During Covid Recession)
Having mentored 1200+ students in 5 years with 1158 successful placements in top tech companies, Kumar knows the struggle of breaking into tech from humble beginnings. His journey from a Tier-4 college to becoming an Amazon SDE will help you for your roadmap to success.
📋 Important Guidelines
✅ Use Your Own Logic & Variables
Don't copy exact variables or logic. Understand concepts and create your own approach.
🎯 Extract Concepts, Not Code
Focus on understanding core ideas and implement them your own way.
🤔 Understand the "Why"
Analyze why each part is necessary to grasp deeper concepts.
🚀 Prepare for Advanced Understanding
Build solid foundation for easy adaptation at higher levels.
🚀 Made for Intermediate Level Students
This course is to be done by those students whose basic programming fundamentals are clear.
📝 Revision Notes Template: Create revision notes like this template: Template Link
Course Completion Path
This is the warm up DSA course. Once you complete it, join the premium 850 hour DSA course at https://training.desiqna.in
You have to complete this to be ready to join the pro batch and start attending pro DSA sessions! (Watch all videos + make notes even if you know the solution)
🔢 Hashing | Prefix Sum | Suffix Sum
| Session | Content | Resources | |
|---|---|---|---|
| Foundation | Hashing Part 0, 1, 2 | ||
| Sessions 0-9 | Concept Building Sessions |
📋 Session-0 📋DOC 📋 Session-1 📋 DOC 📋 Session-2 📋 Doc 📋 Session-3 📋 Doc 📋 Session-4 📋 DOC 📋 Session-5 📋 Doc 📋 Session-6 📋 DOC 📋 Session-7 📋 DOC 📋 Session-8 📋 Doc 📋 Session-9 📋 Doc |
|
| Session 10 | Amazon Interview Session | ||
| Session 11 | Zscaler OA |
📋 Video
📋 DOC |
|
| Session 12 | Two Sum | ||
| Session 13 | Max distance between same elements, Count pairs with given sum=k, First unique character in a string, Find common characters | ||
| Recap | Recap | ||
| Session 14 | Longest Consecutive Sequence, Longest Subarray with 0 sum |
📋 Video
📋DOC 📋DOC |
|
| Session 15 | Count Subarrays having Sum K, Count Subarrays with given XOR |
📋 Video
📋 DOC 📋 DOC |
- |
| Session 16 | Amazon OA 2025 Part-1 (Prefix + Math Modulo) |
📋 Video
📋 Doc |
|
| Session 17 | Hashing(Prefix + Suffix) over Subsequences [Leetcode Contest] |
📋 Video1
📋 Video2 📋 Doc |
|
| Session 18 | Hashing,Prefix Sum,Suffix Sum(Leetcode Contest) |
📋 Video1
📋 Doc |
👉 Two Pointer
| Session | Content | Resources | Importance |
|---|---|---|---|
| Master-class | Two Pointer Template + Master-class | 🔥 VERY IMPORTANT | |
| Foundation | Strong Foundational Video + Google Interview Session |
📋Video 1 📋Google Interview Video |
🏢 Google Interview DOc |
| Microsoft OA | Microsoft Interview Session |
📋Video 1 📋Doc |
|
| Google SDE-3 Interview Part 1 | Google SDE-3 Interview Part 1 |
📋Video 1 📋DOC |
|
| Google SDE-3 Interview Part 2 | Google SDE-3 Interview Part 2 |
📋Video 1 📋DOC |
🎯 Greedy Algorithms
| Topic | Content | Platform/Company | Resources |
|---|---|---|---|
| Introduction | Intro + Leetcode Contest | LeetCode |
📋Video
📋Video 📋DOC 0 📋DOC 1 |
| Advanced | Codeforces(D) Problem Solving | Codeforces |
📋 Video
📋 DOC |
| Competitive | Codechef 1900+ Rated Problems | CodeChef |
📋 Video
📋 DOC |
| Industry OA | IBM OA | IBM |
📋 Video
📋DOC |
| Advanced | Codechef Problem Session | CodeChef |
📋 Video
📋 DOC |
| Hybrid | Greedy + Intuition + Two Pointer | Goldman Sachs |
📋 Video
📋 DOC |
| Advanced | Greedy + Math Analysis | Atlassian (70LPA) |
📋 Video
📋 DOC |
🌀 Recursion
| Session | Content | Resources | Solutions |
|---|---|---|---|
| Session 1 | Introduction (Explanation by Kumar K) |
Video |
📊 Graph
| Session | Content | Resources | |
|---|---|---|---|
| Intro | Intro to graphs | ||
| Session 1 | BFS and its applications |
✅ Video
|
|
| Session 2 | BFS - Graph OA level (Thoughts + Intuition) | ||
| Session 3 | BFS - Intermediate Level Trick + Understanding | ||
| Session 4 | BFS - Uber SDE Interview 2025 | ||
| Session 5 | DFS Master Session (Thoughts + Process + Intuition) |
🧮 Math
| Topic | Content | Resources | |
|---|---|---|---|
| Modulo Knowledge | Fundamental concepts |
📋Video
📋DOC | |
| Math(nCR) | Foundational Concept |
📋Video
📋DOC |
- |
| Factor + Prime Factor | Intro 0 |
📋Video
📋DOC |
- |
| Factor + Prime Factor | Intro 1 |
📋Video
📋DOC |
- |
| Factor + Prime Factor | Codechef Contest P0, P1 |
📋Video 1 📋Video 1 📋DOC |
- |
| Factor Optimization | Google SDE-2 Interview |
📋 Video 1 📋 Video 2 📋 Video 3 📋 DOC | - |
What to Do After Completing This Course
Continue Your Learning Journey
After completing the prerequisite DSA course by Kumar K sir, proceed to the next level:
This comprehensive guide will take your DSA skills to the next level and prepare you for top tech company interviews + OA