[How to get an account / participate in contests?](http://atcoder.jp/posts/2) [AtCoder's Contest Format](http://atcoder.jp/posts/1) - [AtCoder's Testcases](https://www.dropbox.com/sh/nx3tnilzqz7df8a/AAAYlTq2tiEHl5hsESw6-yfLa?dl=0) - [AtCoder's Rating System](https://www.dropbox.com/sh/zpgcogxmmu84rr8/AADcw6o7M9tJFDgtpqEQQ46Ua?dl=0) AtCoder Race Ranking: [2023 Algo](https://img.atcoder.jp/file/gp30/race2023.html), [2024 Heuristic](https://img.atcoder.jp/file/gp30/race2024H.html)