carrot:用于 Codeforces 评级预测的浏览器扩展

<h1> _{<img src="https://raw.githubusercontent.com/meooow25/carrot/master/carrot/icons/icon.svg" alt="Carrot logo" height="38">} Carrot </h1> <a href="https://addons.mozilla.org/en-US/firefox/addon/carrot/"><img src="https://i.imgur.com/WJ9Fhop.png" alt="Mozilla Add-ons" height="48"></a>&emsp;<a href="https://chrome.google.com/webstore/detail/carrot/gakohpplicjdhhfllilcjpfildodfnnn"><img src="https://i.imgur.com/iswHnpJ.png" alt="Chrome Web Store" height="48"></a> 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).