DSA

Data Structures & Algorithms

Clear, interview-focused notes with worked examples. Start with the foundations, then learn one problem-solving pattern at a time. Every article ends with a quick revision box.

Foundations

• How to Approach Any Question

  Five steps with Two Sum walkthrough: understand → brute force → pattern → code → test
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• Big-O in Simple English

  Time and space complexity with clear examples
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Core patterns

• Arrays & Hashing

  Two Sum, duplicates, and anagrams with fast lookup
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• Two Pointers

  Sorted pairs, palindrome, in-place removal
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• Sliding Window

  Fixed and variable windows with step-by-step subarray examples
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• Binary Search

  Sorted search and binary search on answer space, with walkthroughs
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• Stacks & Queues

  LIFO/FIFO, BFS, monotonic stack, valid parentheses
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• Trees — Basics

  DFS/BFS traversals, BST, recursion template
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