Introduction

This is a Leetcode weekly and biweekly contest rating predictor. The APP is available online at 🔗 lccn.lbao.site

Hopefully, you can get the predicted result within 20-30 minutes after the contest has finished.

Features

• ⚡️ Fast

  1. The core prediction algorithm is accelerated by a JIT compiler(Numba) which costs around 20 seconds on a two-cores Intel(R) Xeon(R) Platinum 8255C CPU (@ 2.50GHz).
  2. User's latest rating was cached serval times before predicting which can save a lot of time fetching data.

• 🎯 Accurate

  1. If there were no massive rejudges(say, everyone's global ranking stays unchanged), the rating difference should be negligible.
  2. Please note that a normal case is that there would be some misconduct detection, so your global ranking will be slightly higher even if your submissions are not rejudged, which results in a slightly higher rating :)

• 📱 Responsive web page

  Tested on phones and tablets.

More Information

• 🔗 Chinese introduction on leetcode.cn
• 🔗 refined-leetcode: A Chrome extension for leetcode.cn, created by @XYShaoKang

Underlying Mechanism

Algorithm

• 🔗 English official illustration on leetcode.com
• 🔗 Chinese official illustration on leetcode.cn

Database

• MongoDB: NoSQL database
• Beanie: ODM for MongoDB

Backend

• APScheduler: background tasks
• Numpy and Numba: core prediction algorithm implementation and acceleration
• FastAPI: restful API
• 🚮 Jinja: HTML templates for server-side rendering

Frontend

• React: most popular front-end library
• TailwindCSS and DaisyUI: modern CSS framework and its component library
• 🚮 Materialize: responsive front-end framework
• Echarts: data visualization

Development

Backend Deployment

virtualenv

git clone git@github.com:baoliay2008/lccn_predictor.git
cd lccn_predictor

# write your mongodb environment config
cp config.yaml.template config.yaml
vi config.yaml

python3.10 -m virtualenv venv/
source venv/bin/activate

pip3 install -r requirements.txt

python main.py
uvicorn api.entry:app --host 0.0.0.0 --port 55555

Docker

git clone git@github.com:baoliay2008/lccn_predictor.git
cd lccn_predictor

# write production environment mongodb config
cp config.yaml.template config.yaml
vi config.yaml

# build docker image
docker image build -t lccn_predictor:0.1.1 .

# create docker volume
docker volume create lccn_predictor

# run container
docker run -d -v lccn_predictor:/lccn_predictor -p 55555:55555 --name lp lccn_predictor:0.1.1

docker exec -it lp bash

docker container stop lp

docker container start lp

Frontend Deployment

cd client

# install dependencies
npm install

# change `baseUrl` to your local backend process
vi src/data/constants.js
# if you followed instruction above
# it should be "http://localhost:55555/api/v1"

# local test
npm start

# publish
npm run build

License

MIT License

Changelog

• v0.0.1(2022/11/14)

  make this repo public, first release.

• v0.1.1(2023/02/14)

  change frontend from server-side rendering(Jinja + Materialize) to client-side rendering(React).

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