🩺 DSA Doctor • dsadoctor.com

🎯 The Official Platform for DSA Doctor (dsadoctor.com) — Company-Wise LeetCode Interview Preparation Vault & Diagnostic Engine

🌐 dsadoctor.com • 🧠 DSA Logic Playbook • 💡 Philosophy • 🗺️ Diagnostic Flow • 🏢 Companies • 📑 Schema • 📂 Pages & Tools • ⏱️ Sprints • ❓ FAQ & SEO • 👨‍💻 Founder

Welcome to DSA Doctor (also known as DSADoctor, DSA-Doctor, or dsadoctor.com) — the premier data-driven coding interview intelligence platform.
Diagnose interview patterns. Practice with surgical precision. Secure your dream software engineering offer.

💡 Core Philosophy

Important

Grinding 1,000+ random LeetCode problems does NOT guarantee an interview offer.

Blindly solving problems leads to cognitive burnout, low retention, and failure when interviewers present slight variations. Every tech company has an algorithmic signature—a core set of data structures, problem difficulty bands, and pattern archetypes they repeatedly test during Online Assessments (OAs) and technical rounds.

DSA Doctor (DSADoctor / dsa-doctor), hosted officially at dsadoctor.com, provides a data-driven diagnostic approach: filter real LeetCode questions by Target Company, Recency (30 Days to All-Time), and Relative Frequency %, backed by pattern recognition tags and revision priority markers.

🧠 The DSA Logic Building Playbook (Master Problem-Solving Step-by-Step)

🎯 The #1 Struggle in Coding Interviews is NOT Syntax — It Is Logic Building.

Tip

"Most engineers get stuck in DSA not because they don't know programming syntax, but because they don't have a structured mental model to extract logic from unseen problem descriptions."
— Prem Kumar, Founder of DSA Doctor

To permanently solve this hurdle, DSA Doctor has launched the DSA Logic Building Playbook, available live directly at:
👉 dsadoctor.com/dsa-logic.html (Also accessible via the GitHub Repository).

This playbook breaks down problem-solving into a repeatable, scientific framework equipped with interactive simulators, pattern matching engines, and multi-language production code.

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🌟 What Makes the DSA Logic Building Playbook the Ultimate Preparation Guide?

Module	Core Capability	Candidate Transformation
🪜 7-Step Universal Blueprint	Scientific 7-stage thought pipeline	Eliminates blank-screen anxiety; guarantees progress on unseen problems
🔬 Live Algorithm Dry-Run Visualizer	Interactive paper trace simulator for Two Pointers, Sliding Window & Kadane's	Teaches how manual pointer movements eliminate redundant search iterations
🧭 DSA Pattern Finder Wizard	3-step instant diagnostic matcher (Input Type ➔ Goal ➔ Constraints)	Pinpoints the exact algorithm and target time complexity in under 10 seconds
⏱️ Big-O Complexity Budget Radar	Real-time threshold calculator mapping constraint $N$ to allowed $O(...)$	Stops candidates from writing code that inevitably fails with TLE (Time Limit Exceeded)
🔑 Keyword-to-Pattern Cheat Sheet	Instant keyword trigger lookup with interactive search & filters	Maps words like "contiguous subarray" ➔ Sliding Window, "monotonic" ➔ Binary Search
🧱 10 Production Multi-Language Templates	Production-ready boilerplate in Java, C++, and Python	Persistent language switching with 1-click clipboard copy
💡 8 Deep-Dive Worked Examples	Test case to optimal code walkthroughs with waste analysis	Demonstrates how brute force $O(N^2)$ waste is surgically converted to $O(N)$
🆘 Emergency Protocol & 9-Point Checklist	What to do when stuck + edge case validation with celebratory confetti	Ensures null pointers, integer overflows, and off-by-one errors are caught before submitting

🔬 1. Interactive Live Dry-Run Trace Visualizer

Practice Step 3 of the blueprint ("Solve on Paper First") with our dynamic simulator:

• Two Pointers Trace: Visualizes left and right pointer convergence on sorted arrays, showing real-time boundary shrinkage when sum > target.
• Sliding Window Trace: Dynamic window boundaries tracking contiguous elements, showing how elements are added and evicted in $O(1)$ amortized time.
• Kadane's Algorithm Simulation: Step-by-step visual tracking of running sum resets vs. global maximum subarray updates.
• Full Playback Controls: Step forward, step backward, auto-play animation, and instant reset.

🧭 2. Diagnostic Pattern Finder Wizard

Never wonder "Which data structure should I use?" again:

1. Input Type: Array/String, Sorted Array, 2D Grid/Matrix, Binary Tree, Graph, or Data Stream.
2. Target Condition: Contiguous Subarray, Pair/Triplet Sum, Monotonic Min/Max, Next Greater Element, Shortest Path, Overlapping Subproblems, or Combinations.
3. Constraint Size ($N$): $N \le 20$ (Backtracking), $N \le 5,000$ (DP/Quadratic), $N \le 10^5$ (Linearithmic), $N \ge 10^9$ (Logarithmic Binary Search).

• Output: Instant pattern verdict, intuition rationale, optimal time/space complexity, and direct links to classic LeetCode benchmark problems.

☕ ⚡ 🐍 3. Multi-Language Production Templates

Every core pattern includes battle-tested, syntax-highlighted templates in:

• ☕ Java 17 (Idiomatic Collections, HashMap, PriorityQueue, StringBuilder)
• ⚡ C++ 20 (Modern STL, std::vector, std::unordered_map, std::priority_queue)
• 🐍 Python 3 (Clean list comprehensions, collections.defaultdict, heapq, deque)

👉 Experience the Playbook Live: dsadoctor.com/dsa-logic.html

🗺️ Visual Diagnostic Pipeline

Follow this proven tactical pipeline to prepare systematically for any upcoming assessment or technical interview:

flowchart TD
    classDef input fill:#0a192f,stroke:#00f5ff,stroke-width:2px,color:#00f5ff;
    classDef filter fill:#0d2040,stroke:#2563eb,stroke-width:2px,color:#7ef9ff;
    classDef strategy fill:#1f1338,stroke:#a855f7,stroke-width:2px,color:#e9d5ff;
    classDef practice fill:#064e3b,stroke:#10b981,stroke-width:2px,color:#a7f3d0;
    classDef outcome fill:#1e293b,stroke:#00FF00,stroke-width:2px,color:#4ade80;

    A["🎯 Step 1: Select Target Company<br/>(e.g., Google, Amazon, Uber, Flipkart)"]:::input --> B{"🕒 Step 2: Select Timeline Horizon"}:::filter
    
    B -->|Interview in < 2 Weeks| C["⚡ thirty-days.csv<br/>(Urgent OA & Onsite Trends)"]:::filter
    B -->|Interview in 1 - 2 Months| D["🔥 three-months.csv / six-months.csv<br/>(High-Frequency Core Pool)"]:::filter
    B -->|Foundational Mastery| E["📚 all.csv<br/>(Complete Historical Problem Bank)"]:::filter
    
    C --> F["📊 Step 3: Sort by Frequency % & Revision Priority"]:::strategy
    D --> F
    E --> F
    
    F --> G["🧩 Step 4: Group by Topic Tags & Patterns<br/>(Sliding Window, Monotonic Stack, BFS/DFS, DP)"]:::strategy
    G --> H["🔁 Step 5: Execute 1-3-7-14 Spaced Repetition"]:::practice
    H --> I["🏆 Step 6: Clear OA & Ace Technical Interviews!"]:::outcome

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🏢 Target Company Directory

Jump straight into your target company's curated question bank. Below is a categorized directory of premier hiring companies available in this repository:

🌟 FAANG & Tier-1 Tech Giants

Amazon • Google • Microsoft • Meta • Apple • Netflix

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🚀 High-Growth & Global Product Leaders

Uber • Airbnb • Stripe • Atlassian • Adobe • Salesforce • LinkedIn • Spotify • TikTok • PayPal

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🏦 FinTech, Wall Street & Quant Powerhouses

Citadel • Two Sigma • Goldman Sachs • Morgan Stanley • DE Shaw • Bloomberg • Tower Research

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🇮🇳 Indian Tech Unicorns & Market Leaders

Flipkart • Swiggy • Zomato • Razorpay • PhonePe • Paytm • Zepto • Walmart Labs • Intuit

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☁️ Cloud, Enterprise & AI Innovators

NVIDIA • Snowflake • Datadog • Palantir • Cisco • Oracle • ServiceNow • VMware • Qualcomm • Intel

Tip

Looking for a specific company among all 657 directories?
Use your editor's Quick File Open (Ctrl + P on Windows/Linux, Cmd + P on macOS) and type the company name (e.g., goldman-sachs/thirty-days.csv), or explore using the Interactive Web Dashboard.

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⚖️ The Paradigm Shift: Blind Grind vs. DSA Doctor

Dimension	❌ Traditional Blind Grinding	🩺 The DSA Doctor Framework
Strategy	Solving whatever problem appears on the daily page	Targeted problem sets extracted from verified company interview rounds
Recency Relevance	Solving questions popular in 2018 that are no longer asked	Pinpoint questions reported in the last 30 days, 3 months, or 6 months
Time Investment	500+ unstructured hours with diminishing returns	80% faster preparation by attacking top 20% high-frequency questions
Solving Approach	Memorizing code syntax for individual problems	Identifying underlying Patterns (Two Pointers, Sliding Window, Monotonic Stack, etc.)
Retention	Forgetting solutions within 2 weeks	Structured 1-3-7-14 Day Spaced Repetition Engine
Readiness	Panic during unexpected OA problem types	Total confidence backed by real interview frequency data

📑 Dataset Anatomy & Schema

Each company folder contains structured CSV files partitioned by recency windows, giving you precise control over your preparation timeline:

leetcode-company-wise-interview-questions/
├── amazon/
│   ├── thirty-days.csv              # ⚡ Last 30 days: active OA / interview questions
│   ├── three-months.csv             # 🔥 Last 90 days: trending interview staples
│   ├── six-months.csv               # ⚖️ Last 180 days: high-confidence preparation pool
│   ├── more-than-six-months.csv     # 🏛️ Older questions: recurring algorithmic archetypes
│   └── all.csv                      # 📚 Complete historical archive for the company
├── google/
│   ├── thirty-days.csv
│   ├── three-months.csv
│   └── ...
└── ... (657 total company folders)

🎯 The Optimal Practice Hierarchy

When time is constrained, prioritize problems following this formula:

High Frequency + Recent (30d / 3m) + Medium Difficulty
   ▲
   │  (Solve First: Greatest ROI for FAANG / Tier-1 interviews)
   ▼
High Frequency + Recent + Easy Difficulty
   ▲
   │  (Warm up & speed-run fundamentals)
   ▼
High Frequency + Older Archive (6m / More-than-six-months)
   ▲
   │  (Solidify foundational patterns)
   ▼
Low Frequency + Hard Difficulty
   ▲
   │  (Only after core patterns are mastered; for bar-raiser rounds)

⏱️ Battle-Tested Study Sprints

Whether you have 7 days before an emergency assessment or a full month for campus placements and job switching, execute these structured plans:

⚡ Sprint A: The 7-Day Emergency Sprint (Upcoming Interview)

Designed for rapid triage when an Online Assessment or technical screen is scheduled for next week.

Day	Focus Area	Target Dataset	Daily Output Goal
Day 1	High-Frequency Quick Wins	thirty-days.csv	6 Easy + 2 Medium (Speed & confidence warmup)
Day 2	Arrays, Strings & Two Pointers	thirty-days.csv + three-months.csv	5 Medium (Focus on HashMaps, Prefix Sums, Sliding Window)
Day 3	Trees & Binary Search	three-months.csv	5 Medium (DFS/BFS traversals, LCA, Rotated Array Binary Search)
Day 4	Linked Lists, Stacks & Queues	three-months.csv	5 Medium (Monotonic stack, In-place list reversal, Fast/Slow pointers)
Day 5	Graphs & Dynamic Programming	six-months.csv	4 Medium (Topological Sort, Dijkstra, 1D/2D Memoization)
Day 6	Company-Specific Bar Raisers	all.csv (High Frequency)	2 Hard + 3 Medium (Top frequency signature questions)
Day 7	Timed Mock Simulation & Revision	Missed / Flagged Questions	3 Problems under 45-min timer + behavioral review

🗓️ Sprint B: The 30-Day Comprehensive Placement Blueprint

Designed for thorough preparation for product-based company hiring drives and career transitions.

Week	Phase	Strategic Objective	Key Focus Topics
Week 1	Foundations & Core Linear Patterns	Rebuild speed and algorithmic fluency	Arrays, Two Pointers, Sliding Window, Prefix Sum, Hashing, Linked Lists
Week 2	Hierarchical Structures & Search	Master non-linear data structures	Binary Trees, BST, Binary Search on Answer Space, Heaps / Priority Queues
Week 3	Advanced Algorithms & Optimizations	Conquer complex company favorites	Graphs (BFS/DFS/DSU), Backtracking, 1D/2D Dynamic Programming, Greedy
Week 4	Company Sprints & Mock Simulations	Real interview simulation under pressure	Solve top 40 problems from target company three-months.csv + timed mocks

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📂 Repository Pages & Tools

This repository ships three standalone, dependency-free HTML pages. Open any of them directly in a browser or serve the folder with any static server (e.g. python3 -m http.server).

Page	File	What It Does
🌐 Home / Web App	index.html	The main DSA Doctor landing experience — company-wise problem vault, search, and navigation hub linking to the two tools below.
🧠 DSA Logic Building Playbook	dsa-logic.html	Interactive problem-solving guide — step-by-step logic frameworks, live dry-run execution, and the Pattern Finder Wizard for recognizing LeetCode patterns under interview pressure.
🩺 DSA Master Sheet	dsa-sheet.html	The complete 502-question, 9-phase DSA sheet with topic/subtopic grouping, difficulty stars, direct problem links (LeetCode / GeeksForGeeks / HackerRank), per-question status tracking, revisit flags, and notes — all persisted in localStorage.

🩺 DSA Master Sheet (dsa-sheet.html) Highlights

• 502 curated questions organized into 9 phases (e.g. Fundamentals & Linear Data Structures, Arrays, …) with topic-wise separators and progress counts.
• Track your progress: Not Attempted → Not Tried → Solved/Attempted status dropdowns, plus a Revisit flag (None / Revisit / Can Revisit) for spaced revision.
• Inline notes per question, auto-saved to localStorage — no backend required.
• Search & filter across questions, topics, and subtopics with a live "X of 502 questions" counter.
• Fully responsive layout: mobile card view (≤768px), fluid table view from 769px up to 1600px+ with adaptive column widths, condensed status/revisit labels, and zero horizontal overflow at any viewport width (verified 360–1600px).
• Dark/light theme toggle and collapsible phase sections.

🧠 DSA Logic Playbook (dsa-logic.html) Highlights

• Step-by-step problem-solving framework — teaches how to think instead of memorizing solutions.
• Live Dry-Run visualizer — step through algorithm execution with variable state.
• Pattern Wizard — answer a few hints and get matched to the right LeetCode pattern (two pointers, sliding window, Kadane's, etc.).
• Multi-language code templates: Java | C++ | Python.

⚡ Quick Start & Usage

1. 🌐 Instant Access via Live Web App

Visit the interactive dashboard to search, filter, and inspect roadmaps directly in your browser:
👉 Open DSA Doctor Web App

👨‍💻 Founder & Creator

Prem Kumar

Software Engineer • Full-Stack Developer • Cybersecurity Enthusiast • Creator of DSA Doctor

"Building tools that empower developers to prepare with intention, eliminate interview guesswork, and secure life-changing opportunities."

❓ Frequently Asked Questions (FAQ)

🧠 What is the DSA Logic Building Playbook on dsadoctor.com?

The DSA Logic Building Playbook (accessible at dsadoctor.com/dsa-logic.html) is an interactive, step-by-step mental training system created by Prem Kumar. It solves the biggest issue faced by software engineering candidates: how to build logic for unseen algorithmic problems. It features:

1. The 7-Step Universal Blueprint: A reliable sequence to transition from problem reading to optimized code without blanking out.
2. Live Algorithm Dry-Run Trace Visualizer: Live animated simulations of Two Pointers, Sliding Window, and Kadane's algorithm.
3. DSA Pattern Finder Wizard: A 3-step diagnostic selector that identifies the exact algorithmic pattern and complexity target for any problem.
4. Multi-Language Support: Complete production templates in Java, C++, and Python with 1-click clipboard copy.
5. Pre-Submission Edge Case Checklist: A 9-point verification system to catch null inputs, overflows, and boundary conditions.

🔍 What is DSA Doctor (dsadoctor.com)?

DSA Doctor (also searched as DSADoctor, dsa doctor, dsa-doctor, or dsadoctor.com) is a proprietary algorithmic diagnostic engine and interview preparation platform created by Prem Kumar. It organizes and curates over 17,640+ verified coding interview questions across 650+ tech companies into structured, recency-aware problem banks.

🌐 Where can I access the official DSA Doctor website?

The official web application is live at dsadoctor.com. You can also access the interactive companion mirror at kali-prem.github.io/leetcode-company-wise-interview-questions.

🎯 How does DSA Doctor (dsadoctor) help crack coding interviews?

Instead of grinding random problems, DSA Doctor allows you to:

• Target specific companies (e.g., Google, Amazon, Microsoft, Uber, Flipkart).
• Filter questions by recency: thirty-days.csv for urgent OAs, three-months.csv for interview prep, and all.csv for deep coverage.
• Focus on high-frequency questions first to get maximum preparation ROI in minimum time.
• Identify algorithmic patterns (Two Pointers, Sliding Window, Graphs, DP) rather than memorizing solutions.

💸 Can I access DSA Doctor (dsadoctor.com) for free?

Yes, DSA Doctor (dsadoctor.com) is freely accessible for individual, personal interview preparation. However, all source code, software, datasets, and compilations are Proprietary with All Rights Reserved. Copying, redistributing, scraping, sublicensing, or republishing any portion of this repository for commercial or non-commercial purposes without express prior written permission is strictly prohibited.

🤝 Contributing

We welcome community contributions! If you recently interviewed at a company or noticed new recurring questions:

1. 🍴 Fork the Repository on GitHub.
2. 🌿 Create your Feature Branch (git checkout -b feature/update-company-questions).
3. 🛠️ Update or Add Datasets adhering to the standard schema (ID, URL, Title, Difficulty, Acceptance %, Frequency %, Topic Tags, Pattern, Revision Priority, Notes).
4. 🧹 Verify CSV Formatting ensuring clean commas, quotes, and no corrupted rows.
5. 🚀 Submit a Pull Request with details of recent interview trends.

Note

By submitting a pull request, issue, or contribution, you agree that your contribution is provided to the Copyright Holder and incorporated into this proprietary project under these terms, without granting any ownership or reuse rights to third parties.

⚠️ Disclaimer

This repository is maintained independently for educational and career-preparation purposes. All problem titles, identifiers, and conceptual frameworks are referenced from publicly accessible interview experiences, community submissions, and public technical preparation sources.

LeetCode is a registered trademark of LeetCode LLC. This repository is not affiliated with, endorsed by, or sponsored by LeetCode or any of the corporate organizations listed herein.

📜 License & Copyright

Copyright © 2026 Prem Kumar. All Rights Reserved.

This repository, including all source code, software, CSV datasets, diagnostic algorithms, documentation, and design assets, is strictly proprietary and confidential. This project is NOT open source.

• All Rights Reserved: No permission is granted to copy, clone, reproduce, modify, distribute, sublicense, publish, sell, or reuse this source code, datasets, or substantial portions of it without prior written permission from the Copyright Holder (Prem Kumar).
• GitHub Visibility Notice: Viewing this repository on GitHub or accessing it via GitHub Pages does not grant any rights or license to reuse, fork, copy, or redistribute the code or data.
• Commercial & Non-Commercial Use Prohibited: Both commercial exploitation and non-commercial redistribution or mirroring are strictly prohibited without prior written authorization.
• Personal Preparation: You are permitted solely to view and study the materials for your personal, individual technical interview preparation through official interfaces.

For licensing inquiries, permissions, or corporate use requests:
👉 Contact: Prem Kumar | Official Platform

🔍 Google Search & SEO Index for DSA Doctor (dsadoctor.com)

To help developers, students, and engineers easily discover this platform on Google and search engines across all spelling and spacing variations:

📌 Verified Search Terms & Discovery Index

• 🌐 Exact Brand & Domain Variations:
  dsadoctor • dsa doctor • dsa-doctor • dsa_doctor • dsadoctor.com • https://dsadoctor.com • http://dsadoctor.com • www.dsadoctor.com • dsadoctor com • dsa doctor com • dsadoctor website • dsa doctor website • dsadoctor official • dsadoctor platform • dsadoctor github • dsa doctor github • dsadoctor web app • dsa doctor online

• 👨‍💻 Founder & Creator Search Terms:
  prem kumar dsadoctor • prem kumar dsa doctor • kali-prem dsadoctor • kali-prem dsa doctor • dsadoctor prem kumar • dsa doctor prem kumar • dsadoctor founder • dsa doctor creator

• 🧠 DSA Logic Building & Pattern Recognition Keywords:
  dsa logic building • dsa logic building playbook • how to build logic in dsa • how to solve unseen dsa problems • dsa problem solving framework • dsa pattern finder • dsa pattern finder wizard • algorithm dry run visualizer • leetcode pattern recognition • two pointers visualizer • sliding window visualizer • kadane algorithm visualizer • dsa doctor logic playbook • dsadoctor dsa logic • dsa logic step by step • coding interview logic framework • how to approach leetcode problems • dsa logic for beginners • dsa logic building hindi • dsa mental models

• 📚 DSA Sheet & Preparation Keywords:
  dsadoctor sheet • dsa doctor sheet • dsadoctor dsa sheet • dsa doctor dsa sheet • dsadoctor roadmap • dsa doctor roadmap • dsadoctor leetcode • dsa doctor leetcode • dsadoctor company wise • dsa doctor company wise • dsadoctor company wise questions • dsa doctor interview prep • dsadoctor 7 day sprint • dsadoctor 30 day blueprint • dsadoctor study plans • dsa doctor frequency list • dsadoctor must solve

• 🏢 Company-Wise Search Terms:
  dsadoctor amazon • dsadoctor google • dsadoctor microsoft • dsadoctor meta • dsadoctor apple • dsadoctor netflix • dsadoctor uber • dsadoctor flipkart • dsadoctor goldman sachs • dsadoctor bloomberg • dsadoctor citadel • dsadoctor swiggy • dsadoctor zomato • dsadoctor razorpay

• 🏷️ Industry & Standard LeetCode Tags:
  leetcode-company-wise • leetcode-company-wise-questions • leetcode-company-wise-problems • leetcode-company-wise-solutions • leetcode-interview-preparation • leetcode-interview-prep • leetcode-dsa-sheet • leetcode-dsa-practice • leetcode-important-questions • leetcode-questions-for-interviews • leetcode-questions-with-solutions • coding-interview-questions • coding-interview-problems • dsa-interview-questions • dsa-interview-preparation • software-engineering-interview-questions • faang-interview-questions • faang-coding-interview • top-coding-interview-questions • most-asked-coding-questions • company-wise-coding-questions • online-assessment-questions

⭐ If DSA Doctor assists you in clearing your technical interviews, leave a star!

Stay Disciplined • Master Patterns • Claim Your Engineering Offer 🚀