🧠 DSA Search Engine

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🔍 Live Demo

🚀 https://dsa-search-engine-r4il.onrender.com
(Deployed on Render)

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📖 Overview

A fully functional DSA (Data Structures & Algorithms) Problem Search Engine built using:

• TF-IDF & BM25 for semantic search
• Spellcheck, lemmatization, and stopword filtering
• Clean UI using EJS + Vanilla JS
• Node.js backend using Express

Search over 3,500+ competitive programming problems from LeetCode, InterviewBit, and TechDelight by typing natural phrases like:

• “Two sum”
• “Maximum k sum pairs”
• “subarray equals k”
• “deletion palindrome tree”

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✨ Features

✅ BM25 relevance ranking
✅ Title similarity boosting
✅ Natural language preprocessing
✅ Works with camelCase, typos, numbers (e.g., 2 sum)
✅ Mobile + desktop responsive UI
✅ Dynamic result rendering via AJAX
✅ Deployed on Render with Node.js

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💻 Tech Stack

Layer	Tech
Frontend	HTML, CSS, EJS, JavaScript
Backend	Node.js, Express.js
NLP Engine	TF-IDF, BM25, Stopword Removal, Lemmatization, Spellcheck
Deployment	Render (Free Web Service)
Filesystem	Local .txt file indexing

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📦 Getting Started (Local Setup)

git clone https://github.com/IITApurba/DSA-Search-Engine.git
cd dsa-search-engine
npm install
npm start