DSA Notes

A structured collection of my Data Structures & Algorithms notes, pattern breakdowns, and LeetCode solutions — written in Java.

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Structure

DSA-Notes/
├── Patterns/
│   └── Two-Pointers.md
└── LeetCode/
    ├── LC125-Valid-Palindrome.md
    ├── LC344-Reverse-String.md
    ├── LC408-Valid-Word-Abbreviation.md
    ├── LC680-Valid-Palindrome-II.md
    └── LC977-Squares-of-a-Sorted-Array.md

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Patterns

Pattern	Status
Two Pointers	✅ Done
Sliding Window	🔄 In Progress
Binary Search	⏳ Pending
Fast & Slow Pointers	⏳ Pending
BFS / DFS	⏳ Pending
Dynamic Programming	⏳ Pending

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LeetCode Solutions

#	Title	Difficulty	Pattern
125	Valid Palindrome	Easy	Two Pointers
344	Reverse String	Easy	Two Pointers
408	Valid Word Abbreviation	Easy	Two Pointers
680	Valid Palindrome II	Easy	Two Pointers
977	Squares of a Sorted Array	Easy	Two Pointers

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What Each Note Contains

Pattern notes — concept, Java template, variants, complexity, common mistakes, decision guide, revision log.

LeetCode notes — problem summary, examples, brute force → optimal thought process, Java solution with comments, dry run, complexity, edge cases, mistakes made, similar problems.

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Language

All solutions are written in Java.