https://github.com/meooow25/carrot

A browser extension for Codeforces rating prediction
https://github.com/meooow25/carrot

browser-extension codeforces

Last synced: 3 days ago
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A browser extension for Codeforces rating prediction

• Host: GitHub
• URL: https://github.com/meooow25/carrot
• Owner: meooow25
• License: mit
• Created: 2020-04-05T14:10:33.000Z (over 4 years ago)
• Default Branch: master
• Last Pushed: 2024-09-29T10:48:39.000Z (3 months ago)
• Last Synced: 2024-12-16T08:15:32.509Z (10 days ago)
• Topics: browser-extension, codeforces
• Language: JavaScript
• Homepage:
• Size: 1.43 MB
• Stars: 121
• Watchers: 3
• Forks: 2
• Open Issues: 5
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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  Carrot



 

A browser extension to enhance [Codeforces](https://codeforces.com) ranklists

**For an active contest**  

Carrot calculates rating changes according the current standings when you open the ranklist, and displays them in a new column. Carrot also adds a column showing the delta required to rank up. The delta calculation is done in real time.

**For a finished contest**  

Carrot displays the final deltas of each contestant in a new column and shows their rank change, if any, in an adjacent column.

For both active and finished contests, Carrot displays a column for performance, the rating at which the delta would be zero.

## FAQ

#### How does it work?

Carrot runs in the browser and fetches all the data it needs from the [Codeforces API](https://codeforces.com/apiHelp).  

It then calculates the rating changes following the algorithm published by Mike Mirzayanov [here](https://codeforces.com/blog/entry/20762), slightly modified so that it matches the current CF algorithm. This updated algorithm is adapted from [TLE](https://github.com/cheran-senthil/TLE/blob/master/tle/util/ranklist/rating_calculator.py).  

#### Is this better than [CF-Predictor](https://codeforces.com/blog/entry/50411)?

Not necessarily. The CF-Predictor extension communicates with a server, while Carrot fetches data and performs all calculations in the browser. So the network usage is significantly lower for CF-Predictor. However, Carrot is ~~100% accurate~~ (see [#18](https://github.com/meooow25/carrot/pull/18)), it works in real time, and it shows performance values.

#### How is Carrot fast enough to calculate rating changes of every contestant in real time?

FFT. The answer is always FFT.

#### I found a bug or would like to request a feature.

Reports are welcome, please [open an issue](https://github.com/meooow25/carrot/issues).