DSA Problems

About DSA Problems

DSA Problems (dsaproblems.site) is a clean, developer-first, open educational resource created to guide software engineers, computer science students, and tech professionals from foundational algorithm concepts to advanced coding interview problem-solving for top-tier global technology companies.

Curated 1,000 Problem Roadmap

Rather than overwhelming learners with random question sets, our curriculum organizes exactly 1,000 verified LeetCode problems into a structured, pattern-based progression:

• 200 Easy Problems: Build essential intuition across fundamental data structures (Arrays, Strings, Hash Maps, Linked Lists, Stacks, Queues).
• 500 Medium Problems: Master core problem patterns asked in 85%+ of FAANG and Big Tech technical interviews (Two Pointers, Sliding Window, Binary Search, Trees, Graphs, Dynamic Programming, Backtracking).
• 300 Hard Problems: Conquer advanced algorithmic strategies (Segment Trees, Fenwick Trees, Disjoint Set Union, Advanced Graph Algorithms, Complex 2D/3D DP).

Multi-Language Solution Implementations

Every problem in the roadmap features clean, idiomatic, verified solution code across four major programming languages: C++ (modern STL), Java (Collections framework), Python 3, and JavaScript (ES6+), complete with time complexity ($O(N)$, $O(\log N)$) and auxiliary space complexity analysis.

Zero Tracking & Privacy-First Architecture

We believe high-quality technical education should be accessible to everyone without friction. DSA Problems requires no mandatory account registration or passwords. Your solved questions, bookmarks, notes, and theme choices are stored 100% locally in your web browser via localStorage.

Privacy Policy

Effective Date: August 31, 2026 | Last Updated: August 2026

1. Overview & Data Protection Philosophy

At DSA Problems (dsaproblems.site), the privacy of our visitors is of paramount importance. This Privacy Policy document outlines the types of information collected and recorded by dsaproblems.site and how we use it in full compliance with international privacy frameworks including the EU General Data Protection Regulation (GDPR), California Consumer Privacy Act (CCPA), and Google Publisher Policies.

2. Local Storage & Zero Server-Side PII

Our platform is designed with a privacy-by-default architecture. We do not require you to create an account, log in, or provide personal identifiable information (PII) such as your name, phone number, or home address. All problem completion checklists, personal solution notes, bookmarks, and UI display settings are saved strictly in your client-side browser storage (localStorage). This data remains under your full control on your personal device and is never uploaded to our servers.

3. Log Files & Standard Web Analytics

Like most standard web hosting services, dsaproblems.site utilizes standard server log files. The information inside log files includes internet protocol (IP) addresses, browser type, Internet Service Provider (ISP), date/time stamp, referring/exit pages, and number of clicks. These logs are used solely for site maintenance, uptime monitoring, security auditing, and server performance optimization. They are not linked to any personally identifiable information.

4. Google AdSense & DoubleClick DART Cookies

Google is a third-party vendor on our site. Google uses cookies, specifically the DoubleClick DART cookie, to serve ads to our site visitors based upon their visit to dsaproblems.site and other sites on the internet.

Visitors may choose to decline or opt out of the use of DART cookies by visiting the Google Ad and Content Network Privacy Policy at: https://policies.google.com/technologies/ads.

5. Third-Party Advertising Partners & Opt-Out

Third-party ad servers or ad networks use technologies like cookies, JavaScript, or Web Beacons that are used in their respective advertisements and links that appear on dsaproblems.site. They automatically receive your IP address when this occurs. These technologies are used to measure the effectiveness of their advertising campaigns and/or to personalize the advertising content that you see.

You can opt out of targeted digital advertising via:

• Digital Advertising Alliance (DAA) Consumer Choice Page
• European Interactive Digital Advertising Alliance (EDAA)
• Google Ads Settings

6. GDPR & CCPA Rights for Visitors

Under GDPR (for European Economic Area visitors) and CCPA/CPRA (for California residents), you have the right to access, rectify, port, or request erasure of your data. Because our application does not store personal data on central servers, you can clear all stored site data anytime by simply clearing your browser's local cache or clicking "Clear Local Data".

7. Contact Information

If you have additional questions or require more information about our Privacy Policy, do not hesitate to contact our administrative team via email at mdhashmi955@gmail.com.

Terms of Service

Effective Date: August 31, 2026 | Last Updated: August 2026

1. Acceptance of Terms

By accessing or using DSA Problems (dsaproblems.site), you acknowledge that you have read, understood, and agree to be bound by these Terms of Service and our Privacy Policy. If you do not agree with any part of these terms, please discontinue using this website.

2. Educational Use License

DSA Problems grants users a personal, non-exclusive, non-transferable, revocable license to view, study, practice, and learn from algorithmic explanations, source code examples, and educational materials provided on the site for individual study and technical interview preparation.

3. Third-Party Platform References (Fair Use)

Problem titles, numbers, and practice links reference publicly recognized algorithmic challenges commonly found across platforms like LeetCode for educational reference and indexing purposes under Fair Use. All external practice links open third-party platforms directly in new browser tabs.

4. User Conduct & Acceptable Use

You agree not to engage in any activity that disrupts or interferes with the service, including automated scraping at abusive frequencies, attempting unauthorized access, or distributing malicious scripts.

5. Disclaimer of Warranties & Limitation of Liability

The service, code snippets, and curriculum are provided on an "AS IS" and "AS AVAILABLE" basis without warranties of any kind. DSA Problems does not guarantee specific job placements, interview offers, or employment outcomes with any organization.

6. Modifications & Contact

We reserve the right to modify these terms at any time. Continued use of the website following changes constitutes acceptance. For inquiries regarding these terms, contact mdhashmi955@gmail.com.

Disclaimer & Fair Use Notice

Last Updated: August 2026

1. Educational Purpose & Non-Affiliation

DSA Problems (dsaproblems.site) is an independent educational platform created to help software developers learn data structures and algorithms.

This website is NOT affiliated, associated, authorized, endorsed by, or in any way officially connected with LeetCode LLC, Google LLC, Meta Platforms Inc., Apple Inc., Amazon.com Inc., Microsoft Corporation, or any of their subsidiaries or affiliates.

2. Trademark Notice

"LeetCode" and related names, marks, emblems, and images are registered trademarks of their respective owners. Company names mentioned on problem cards are listed strictly for historical algorithmic categorization and interview contextualization under Nominative Fair Use.

3. Code Implementations

All code samples, complexity proofs, and architectural patterns on dsaproblems.site are independently curated for computer science pedagogy. While we strive for 100% accuracy, solutions are provided for educational review and self-study.

Dataset Quality & Duplicate Prevention Tool

Internal tool for dataset verification and title normalization.

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