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Documentation Index

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DSA preparation is the single most common bottleneck in technical interviews, and it is also the area where the right resources and strategy matter more than raw hours invested. Grinding 500 random LeetCode problems teaches you less than deliberately working through 150 pattern-organized problems with proper review. The resources below are organized by purpose so you can build a structured prep plan rather than wandering aimlessly through problem sets.

LeetCode Sheets (by priority)

Start with the smallest set and expand only after you can solve those problems consistently. Breadth of patterns matters more than total problem count.
  1. Neetcode 150https://neetcode.io/ — The gold standard starting point. Covers every major pattern (sliding window, two pointers, trees, graphs, dynamic programming) with video explanations for each problem. If you can confidently solve all 150, you are prepared for most mid-level and many senior-level coding interviews.
  2. Neetcode 250https://neetcode.io/ — An extended set for candidates targeting FAANG or companies known for harder questions (e.g., Google, Meta). Adds harder variants and additional patterns beyond the 150.
  3. Faraz’s 300 sheet (pattern-based)https://learnyard.com/practice/dsa — Organized by pattern rather than difficulty, which helps you recognize problem types during interviews. Especially useful if you are past the basics and want to train pattern recognition.

DSA Channels

These channels explain not just the “what” but the “why” behind each approach, which is what you need to generalize solutions to unseen problems.
  • Neetcodehttps://www.youtube.com/@NeetCode — Clean explanations with visual walkthroughs. Best for interview-focused DSA. His roadmap video is a good starting point for planning your prep.
  • Striverhttps://www.youtube.com/@takeUforward — Comprehensive coverage with his A-Z DSA sheet. Particularly strong on trees, graphs, and dynamic programming. His structured sheet approach works well for systematic preparation.

Core Picks for Competitive Programming

If your goal extends beyond interviews into competitive programming (ICPC, Codeforces, CodeChef), these resources cover the advanced topics that separate contestants from interview preppers.

Templates and Tracking

Tracking your progress and maintaining templates for common patterns saves time during practice and prevents you from re-learning the same boilerplate.
Practice strategy: Alternate problem-solving days with concept-review days (reading editorials and studying theory). Keep a mistake log where you record every problem you got wrong or took too long on, along with the pattern you missed. Review this log weekly — you will find that 80% of your mistakes fall into 3-4 recurring categories, and fixing those gives you the biggest improvement per hour invested.
For interview prep specifically, prioritize the Neetcode 150 over competitive programming resources. CP builds deeper algorithmic thinking over months and years, but the Neetcode 150 is calibrated for the exact difficulty and pattern distribution you will see in real interviews. Use CP resources after you have the interview fundamentals covered.