Contest
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First-time users: practice contest / Library testing: AtCoder Library Practice Contest
Upcoming Contests
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Ranking: Algorithm
<a href="https://www.youtube.com/live/GSXLhawvkYE"><img src="https://img.atcoder.jp/awtf2025heuristic/awtf2025algo_en720.png"></a>
<a href="https://www.youtube.com/live/TG3ChQH61vE"><img src="https://img.atcoder.jp/awtf2025heuristic/awtf2025heu720.png"></a>
Important announcements
- [2025-07-19] New Generative AI Rule Changes Regarding ARC Div. 1
- [2025-06-16] Introduction of Generative AI Rules in AHC
- [2025-04-17] Regarding Judge Queue Delays and Future Measures
- [2025-03-20] Changes to the Rated Cap of ARC Div.1
- [2025-01-17] AHC's New Rating System
- [2025-01-15] Tentative 2025 AHC Schedule
- [2025-01-15] Announcement of AtCoder World Tour Finals 2026
- [2024-12-16] Information
- [2024-12-06] Regarding Rule Changes in ABC and ARC Due to Technological Advancement of Generative AI
- [2024-12-04] Password Management for Your AtCoder Account
- [2024-12-03] Announcement Regarding ARC's Division System
- [2024-08-08] Restructuring of contests
Recent contest announcements
- [2025-07-19] New AtCoder Regular Contest 202 (Div. 1) Announcement
- [2025-07-18] New Japan Registry Services (JPRS) Programming Contest 2025#2 (AtCoder Beginner Contest 415) Announcement
- [2025-07-16] New AtCoder World Tour Finals 2025 Algorithm Announcement (with Unrated Mirror)
- [2025-07-15] New World Tour Finals 2025 Heuristic Announcement
- [2025-07-11] Mirrativ Programming Contest 2025 (AtCoder Beginner Contest 414) Announcement
We will hold <a href="https://atcoder.jp/contests/arc202">AtCoder Regular Contest 202 (Div. 1)</a>.
- Contest URL: https://atcoder.jp/contests/arc202
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250720T2100&p1=248
- Duration: 150 minutes
- Number of Tasks: 4
- Writer: <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>
- Tester: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/maspy" class="username"><span class="user-red">maspy</span></a>
- Rated range: 1600 ~ 2999
The point values will be 700-800-900-1000.
**Please note that starting from this contest, [AtCoder Rules against Generative AI](https://info.atcoder.jp/entry/llm-rules-en) will also apply to ARC Div.1.**
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/abc415">Japan Registry Services (JPRS) Programming Contest 2025#2 (AtCoder Beginner Contest 415)</a>.
- Contest URL: https://atcoder.jp/contests/abc415
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250719T2100&p1=248
- Duration: 100 minutes
- Writer: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/yuto1115" class="username"><span class="user-red">yuto1115</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-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-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: 100-200-350-400-450-525-575
We are looking forward to your participation!
We will hold AtCoder World Tour Finals 2025 Algorithm.
- Contest URL: https://atcoder.jp/contests/awtf2025algo
- Mirror Contest URL: https://atcoder.jp/contests/awtf2025algo-open
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250717T1200&p1=248
- Duration: 300 minutes
- Number of Tasks: 5
- Writer: <a href="/user/maroonrk" class="username"><span style="color:#869120;">maroonrk</span></a>
- Tester: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/user/maspy" class="username"><span class="user-red">maspy</span></a>, <a href="/user/IH19980412" class="username"><span class="user-red">IH19980412</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-4.png" class="user-rating-stage-m"><a href="/user/hirayuu_At" class="username"><span class="user-orange">hirayuu_At</span></a>
- Rated range: Unrated
The point values will be 800-1000-1400-1400-2000.
We don't freeze the standings in the contest.
AtCoder World Tour Finals 2025 is an international onsite contest.
We have invited top-runners of AtCoder Race Ranking 2024 to Tokyo.
On the contest day, we will stream the contest on our YouTube channel.
For more details, please visit this page (https://info.atcoder.jp/more/contents/awtf/2025).
The mirror contest is Unrated and the standings is hidden. Other rules are the same as AGC. Specifically, there are no restrictions on the usage of AI.
We will hold <a href="https://atcoder.jp/contests/awtf2025heuristic">World Tour Finals 2025 Heuristic</a>.
- Contest URL: https://atcoder.jp/contests/awtf2025heuristic
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250716T0900&p1=248
- Duration: 10 hours
- Writer: <a href="/users/wata_admin" class="username"><span class="user-unrated">wata_admin</span></a>
**AtCoder World Tour Finals 2025** is an international onsite contest. We have invited top-runners of AtCoder Race Ranking 2024 to Tokyo. On the contest day, we will stream the contest on our YouTube channel. For more details, please visit this page (https://info.atcoder.jp/more/contents/awtf/2025) .
As part of the event, OpenAI will participate as a sponsor, and a special exhibition match titled **“Humans vs AI”** will be held, where top human programmers compete against a cutting-edge AI developed by OpenAI.
There will be no open contest for this final.
We hope you enjoy watching the event!
We will hold <a href="https://atcoder.jp/contests/abc414"> Mirrativ Programming Contest 2025 (AtCoder Beginner Contest 414)</a>.
- Contest URL: https://atcoder.jp/contests/abc414
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250712T2100&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/sheyasutaka" class="username"><span class="user-orange">sheyasutaka</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>, <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-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-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: 100-200-350-400-475-525-625
We are looking forward to your participation!