Spin and Code! A fun and educational tool that randomly selects LeetCode problems to help you practice coding challenges with precision.
LeetCode Roulette is a web application that randomly selects LeetCode problems based on your preferences. Whether you want to practice specific topics, difficulty levels, or target problems within a certain rating range, this tool makes your practice sessions more engaging and efficient.
This project started when my friend Ishan and I (Prathamesh) discovered we could create a game-like experience to make LeetCode practice more fun and less overwhelming. Instead of scrolling through hundreds of problems trying to decide what to solve next, we envisioned a "roulette" system that would randomly pick problems for you.
During our research, we came across zerotrac's incredible work on LeetCode problem ratings. Zerotrac's project calculates the difficulty ratings of LeetCode contest problems using sophisticated algorithms (Elo rating system and Maximum Likelihood Estimation), providing a more accurate representation of problem difficulty than the standard Easy/Medium/Hard classifications.
By integrating zerotrac's ratings data, Ishan and I were able to add a powerful feature that helps students:
- Target their skill level by filtering problems within specific rating ranges
- Progress systematically from easier to harder problems
- Understand true difficulty beyond the basic three-tier system
- Practice more effectively with data-driven problem selection
This combination of gamification and data-driven insights makes LeetCode practice more engaging and helps students learn more efficiently.
- 🎯 Smart Filtering: Filter by difficulty (Easy/Medium/Hard), topic tags, and rating ranges
- 📊 Rating-Based Selection: Uses contest ratings to help you find problems at your skill level
- 🎲 Random Selection: Let fate decide your next challenge
- 🚫 Exclude Paid Problems: Focus on free problems only
- 🔗 Direct Links: One-click access to problems on LeetCode
The ratings used in this project are provided by zerotrac. These ratings are calculated based on:
- Elo Rating System: Similar to chess ratings, problems are rated based on contest performance
- Maximum Likelihood Estimation: Statistical methods to estimate true problem difficulty
Note from zerotrac: The corresponding backend calculates the rating of problems in LeetCode weekly/biweekly contests based on the Elo rating system as well as Maximum Likelihood Estimation. It is not a 100% accurate result, but sufficient for evaluating the relative difficulty of a problem.
All the data needed during calculation are obtained by web crawlers. In order not to violate any potential terms and regulations, the backend code is not open-sourced. Moreover, as the APIs are different amongst contests, the result does not contain the problems in 1st-62nd weekly contests.
Please refer to
ratings.txtfor the raw data sorted in descending order. This will be updated every week after the contest(s).
- Problem Ratings: zerotrac - For providing the LeetCode problem ratings data that powers the rating-based filtering feature
- LeetCode: For the problem database and platform
- Node.js (v14 or higher)
- npm or yarn
- Clone the repository:
git clone https://github.com/yourusername/leetcoderoulette.git
cd leetcoderoulette- Install server dependencies:
npm install- Install client dependencies:
cd client
npm install
cd ..- Start the development server:
# Terminal 1: Start backend server
npm start
# Terminal 2: Start frontend dev server
npm run client:dev- Open your browser and navigate to
http://localhost:5173(or the port shown in the terminal)
# Build the client
npm run client:build
# Start the server (serves both API and static client)
npm start- Select Filters: Choose your preferred difficulty, topic, and rating range
- Spin: Click the "Spin" button to randomly select a problem
- Practice: Open the problem on LeetCode and start coding!
Contributions are welcome! Feel free to open issues or submit pull requests.
See LICENSE file for details.