Contest
Permanent Contests
| Contest Name |
|---|
| ◉ practice contest |
| ◉ AtCoder Library Practice Contest |
Upcoming Contests
Recent Contests
[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)](https://img.atcoder.jp/file/gp30/race2023.html)
Currently, some kind of attack may make it difficult to access the contest site.
We will take the following three countermeasures.
This will make it harder for the contest site to become unrated even if it is down, so please continue to participate in the contest even if it is difficult to connect.
### Printable problem statement page
Although we are taking countermeasures against attacks, we anticipate that the connection to the contest site will be unstable.
After the contest has started, you can check the problem statements even if you have difficulty accessing them by opening the "Tasks for printing" page at the bottom of the problem list.
### Extension of contest time
If you are unable to connect to the contest site, we will extend the contest time by about half of the server down time, up to by 20 minutes.
We will hold <a href="https://atcoder.jp/contests/abc305">KYOCERA Programming Contest 2023（AtCoder Beginner Contest 305）</a>.
- Contest URL: https://atcoder.jp/contests/abc305
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20230610T2100&p1=248
- Duration: 100 minutes
- Number of Tasks: 8
- Writer: <a href="/users/MMNMM" class="username"><span class="user-orange">MMNMM</span></a>, <a href="/users/Nyaan" class="username"><span class="user-red">Nyaan</span></a>, <a href="/users/evima" class="username"><span class="user-unrated">evima</span></a>, <a href="/users/nok0" class="username"><span class="user-orange">nok0</span></a>
- Tester: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/PCTprobability" class="username"><span class="user-red">PCTprobability</span></a>, <a href="/users/nok0" class="username"><span class="user-orange">nok0</span></a>
- Rated range: ~ 1999
The point values will be 100-200-300-450-475-525-550-650.
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/ahc020">ALGO ARTIS Programming Contest 2023 (AtCoder Heuristic Contest 020)</a>.
- Contest URL: https://atcoder.jp/contests/ahc020
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20230611T1500&p1=248
- Duration: 4 hours
- Writer: <img src="//img.atcoder.jp/assets/icon/crown_gold.png"> <a href="/users/terry_u16" class="username"><span class="user-red">terry_u16</span></a>
- Rated range: All (Heuristic Rating)
The goal of AHC is to create a better solution to a problem for which it is difficult to find the optimal solution.
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/abc304">Tokio Marine & Nichido Fire Insurance Programming Contest 2023（AtCoder Beginner Contest 304)</a>.
- Contest URL: https://atcoder.jp/contests/abc304
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20230603T2100&p1=248
- Duration: 100 minutes
- Number of Tasks: 8
- Writer: <a href="/users/cn449" class="username"><span class="user-red">cn449</span></a>, <a href="/users/leaf1415" class="username"><span class="user-orange">leaf1415</span></a>, <a href="/users/evima" class="username"><span class="user-unrated">evima</span></a>, <a href="/users/kyopro_friends" class="username"><span class="user-orange">kyopro_friends</span></a>, <a href="/users/physics0523" class="username"><span class="user-orange">physics0523</span></a>
- Tester: <a href="/users/kyopro_friends" class="username"><span class="user-orange">kyopro_friends</span></a>, <a href="/users/mechanicalpenciI" class="username"><span class="user-orange">mechanicalpenciI</span></a>
- Rated range: ~ 1999
The point values will be 100-200-300-400-475-525-625-625.
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/arc161">AtCoder Regular Contest 161</a>.
- Contest URL: https://atcoder.jp/contests/arc161
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20230528T2100&p1=248
- Duration: 120 minutes
- Number of Tasks: 6
- Writer: <a href="/users/ygussany" class="username"><span class="user-orange">ygussany</span></a>
- Tester: <img src="//img.atcoder.jp/assets/icon/crown_silver.png"> <a href="/users/tatyam" class="username"><span style="color:#FF6040;">tatyam</span></a>, <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/potato167" class="username"><span class="user-red">potato167</span></a>
- Rated range: ~ 2799
The point values will be 300-400-500-500-800-900.
We are looking forward to your participation!
NS Solutions Corporation Programming Contest 2023（AtCoder Beginner Contest 303） Announcement
posted:We will hold <a href="https://atcoder.jp/contests/abc303">NS Solutions Corporation Programming Contest 2023（AtCoder Beginner Contest 303）</a>.
- Contest URL: https://atcoder.jp/contests/abc303
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20230527T2100&p1=248
- Duration: 100 minutes
- Number of Tasks: 8
- Writer: <a href="/users/nok0" class="username"><span class="user-orange">nok0</span></a>, <a href="/users/m_99" class="username"><span class="user-orange">m_99</span></a>, <a href="/users/evima" class="username"><span class="user-unrated">evima</span></a>
- Tester: <a href="/users/physics0523" class="username"><span class="user-orange">physics0523</span></a>, <a href="/users/yuto1115" class="username"><span class="user-red">yuto1115</span></a>
- Rated range: ~ 1999
The point values will be 100-200-300-400-475-525-550-600.
We are looking forward to your participation!