Contest
Permanent Contests
| Contest Name |
|---|
| ◉ practice contest |
| ◉ AtCoder Library Practice Contest |
Upcoming Contests
Recent Contests
Ranking: Algorithm
<a href="https://www.youtube.com/live/uajgh54TRu8?si=IZoVlaBBQ5yP1Vtx" target="_blank" rel="noopener"><img src ="https://img.atcoder.jp/img/awtf2024archive_english.png" class="img-responsive center-block"></a>
[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: [2024 Algo](https://img.atcoder.jp/file/gp30/race2024.html), [2024 Heuristic](https://img.atcoder.jp/file/gp30/race2024H.html)
Beware of suspicious websites claiming to be AtCoder. [Click here](https://atcoder.jp/posts/1269) for more information.
We will restructure the contests.
- Admins (From September 2024)
- The admin of AWTF will be <a href="/user/maroonrk" class="username"><span style="color:#869120;">maroonrk</span></a>. (no change)
- The admin of AGC will be <a href="/user/maroonrk" class="username"><span style="color:#869120;">maroonrk</span></a>. (no change)
- The admin of ARC will be changed from <a href="/user/maroonrk" class="username"><span style="color:#869120;">maroonrk</span></a> to <img src="//img.atcoder.jp/assets/icon/crown_silver.png"> <a href="/user/snuke" class="username"><span style="color:#1000AC;">snuke</span></a>.
- The admin of ABC will be <img src="//img.atcoder.jp/assets/icon/crown_silver.png"> <a href="/user/snuke" class="username"><span style="color:#1000AC;">snuke</span></a>. (no change)
- Frequency of contests
- We will hold AWTF once per year.
- From August 2024 to December 2024, we will hold AGC once per month. The frequency of AGC in 2025 hasn't been decided yet.
- We will hold ARC once or twice per month. At least 20 per year.
- We will hold ABC almost every week.
- Rated ranges (from AGC067/ARC184)
- We will raise the lower bound of the rated range of AGC to 2000. (no upper bound)
- We will raise the lower bound of the rated range of ARC to 1200. (The upper bound will remain 2799)
- The rated range of ABC will be 0-1999. (no change)
- The difficulties and the point values of ARC (From September 2024 / ARC 184)
- The problems will be mainly adjusted for yellows and oranges.
- If we predict that a problem will be solved by about half of the participants around rating 2000, we will usually assign 600 points to the problem (sometimes we may slightly adjust it for various reasons). Similarly, 2400 - 800, 2800 - 1000.
- We will mainly use problems with 600 points or lower for A/B, problems between 600-1000 points for C/D/E, and problems with 1000 points or higher for F.
- The difficulty of problems A/B/C/D will be similar to recent ARCs. E/F (especially E) will be easier.
We will hold <a href="https://atcoder.jp/contests/abc378">AtCoder Beginner Contest 378</a>.
- Contest URL: https://atcoder.jp/contests/abc378
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20241102T2100&p1=248
- Duration: 100 minutes
- Writer: <img src="//img.atcoder.jp/assets/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/sotanishy" class="username"><span class="user-orange">sotanishy</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-2.png" class="user-rating-stage-m"><a href="/users/nok0" class="username"><span class="user-orange">nok0</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/physics0523" class="username"><span class="user-orange">physics0523</span></a>
- Tester: <img src="//img.atcoder.jp/assets/user/user-orange-4.png" class="user-rating-stage-m"><a href="/users/Nyaan" class="username"><span class="user-orange">Nyaan</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-4.png" class="user-rating-stage-m"><a href="/users/mechanicalpenciI" class="username"><span class="user-orange">mechanicalpenciI</span></a>
- Rated range: ~ 1999
- The point values: 100-200-300-425-475-500-650
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/arc186">AtCoder Regular Contest 186</a>.
- Contest URL: https://atcoder.jp/contests/arc186
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20241027T2100&p1=248
- Duration: 120 minutes
- Number of Tasks: 5
- Writer: <img src="//img.atcoder.jp/assets/user/user-orange-4.png" class="user-rating-stage-m"><a href="/users/nuip" class="username"><span class="user-orange">nuip</span></a>
- Tester: <a href="/users/maroonrk" class="username"><span style="color:#869120;">maroonrk</span></a>
- Rated range: 1200 ~ 2799
The point values will be <s>800-900-900-900-1000</s> <font color="red">900-900-900-900-1000</font>.
Note: This ARC also serves as a qualification round to select the 18 contestants for the Japanese national finals, making it significantly more difficult than a regular ARC. <s>(For reference, the difficulty is close to that of ARC184.)</s>
<font color="red">Due to circumstances, we replaced the tasks and changed the point values. Since there are no easy tasks, the difficulty level of solving one or more tasks has increased. Please be careful. Since the difficulty level is flat, we recommend reading all the tasks and not necessarily solving them in order.</font>
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/abc377">TOYOTA SYSTEMS Programming Contest 2024（AtCoder Beginner Contest 377)</a>.
- Contest URL: https://atcoder.jp/contests/abc377
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20241026T2100&p1=248
- Duration: 100 minutes
- Writer: <img src="//img.atcoder.jp/assets/user/user-orange-2.png" class="user-rating-stage-m"><a href="/users/MMNMM" class="username"><span class="user-orange">MMNMM</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/sounansya" class="username"><span class="user-orange">sounansya</span></a>
- Tester: <img src="//img.atcoder.jp/assets/user/user-orange-2.png" class="user-rating-stage-m"><a href="/users/physics0523" class="username"><span class="user-orange">physics0523</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/kyopro_friends" class="username"><span class="user-orange">kyopro_friends</span></a>
- Rated range: ~ 1999
- The point values: 100-200-300-400-475-550-575
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/abc376">AtCoder Beginner Contest 376</a>.
- Contest URL: https://atcoder.jp/contests/abc376
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20241019T2100&p1=248
- Duration: 100 minutes
- Writer: <img src="//img.atcoder.jp/assets/user/user-orange-4.png" class="user-rating-stage-m"><a href="/users/yuto1115" class="username"><span class="user-orange">yuto1115</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-4.png" class="user-rating-stage-m"><a href="/users/Nyaan" class="username"><span class="user-orange">Nyaan</span></a>, <a href="/users/evima" class="username"><span class="user-unrated">evima</span></a>
- Tester: <img src="//img.atcoder.jp/assets/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/sotanishy" class="username"><span class="user-orange">sotanishy</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-2.png" class="user-rating-stage-m"><a href="/users/toam" class="username"><span class="user-orange">toam</span></a>
- Rated range: ~ 1999
- The point values: 150-250-350-400-475-550-650
We are looking forward to your participation!
From 2025, we plan to make changes to the number of contests and the rating system in the AtCoder Heuristic Contest (AHC).
For details about the changes, please refer to the following page and participate in the survey.
- Details and Responses: https://atcoder.jp/contests/ahc-survey2024
- Response Period: Until Sunday, October 27, 2024
### Changes
1. The number of contests will increase. There are two options regarding the number of short and long contests, so please let us know your preference.
2. A time-based decay will be introduced to the rating system. There are two options regarding the timing of the decay, so please let us know your preference.