🚀 LeetCodeRevs

A powerful personalized DSA revision system that assigns daily coding questions based on your performance and topic understanding. Built with real-time notifications, submission support, and a native Java CLI interface, this system ensures consistency, growth, and streak maintenance for LeetCode-style problem-solving.

Supports Java, C++, and Python.

---

👤 For Users (CLI)

✅ Key Features

• 🔐 Login once — persistent sessions via cookies
• 📮 Automatically assigned questions every 24 hours
  • Performance-based (based on your historical weights)
  • Topic-based (weaker topic priority)
• 🔃 Automatically fetches latest LeetCode questions using internal API
• 📁 Auto-generate code templates with test case stubs
• 💻 Supported Languages: Java, C++, Python
• 🔔 Real-time notification alerts for:
  • New daily assignments
  • Streak reminder if not solved by night
• ✅ CLI Submission Runner (coming soon)

🧾 Commands

Command	Description
lcr -login	Login and start session
lcr -getDailyQues1 --lang java	Get performance-based daily assigned question
lcr -getDailyQues2 --lang cpp	Get topic-wise weak area assigned question
lcr -check	Check if user session is valid
lcr -submit	Submit code and check against test cases (coming soon)

---

---

Internals & Architecture

Assignment Logic

• Every day, two questions are auto-assigned to the user:

  1. Performance-based assignment:
     • Uses a weight-based probabilistic algorithm to prioritize weaker questions.
  2. Topic-based assignment:
     • Based on the least-performing topic area using past submission metadata.

• The system automatically fetches the latest LeetCode questions and metadata (title, link, tags, difficulty, etc.) using a scraping/parser utility.

• Each question’s weight is updated after every submission depending on:

  • Time taken to solve
  • Number of retries
  • Difficulty

• Question pool avoids repetition until sufficient time has passed or weak weight re-emerges.

---

Tech Stack

Layer	Tech Used
Backend	Spring Boot, Spring Security, MongoDB
CLI Client	Java 17, Picocli, HttpClient
Notifications	STOMP WebSocket (SockJS) + React Toastify
Caching	Caffeine
Submission	Judge0 API (planned)
LeetCode Sync	Internal Scraper / API Puller for question sync

---

Notifications System

• Real-time alerts are sent using WebSocket & STOMP.
• Users receive:
  • Assignment push every morning
  • Reminder push if not solved by night
• Notifications are shown in-app and via system notifications in frontend.
• CLI version may add push-like terminal alerts in future (TBD).

---

Future Plans

• ⚙️ Online Code Submission Runner (via Judge0 API)
• 📈 Graphical dashboard (track topic progress & time trends)
• 🕒 Streak tracking system
• 📦 Better CLI integration with a built-in code executor
• 🧠 Adaptive recommender system using ML for question difficulty