Contest
Permanent Contests
First-time users: practice contest / Library testing: AtCoder Library Practice Contest
Upcoming Contests
Recent Contests
Daily Contests
| Start Time | Contest Name |
|---|---|
| ◉ AtCoder Weekday Contest 0116 Beta |
Ranking: Algorithm
| User | Rating | |
|---|---|---|
| 1 | |
3797 |
| 2 | |
3670 |
| 3 | |
3659 |
| 4 | |
3629 |
| 5 | |
3619 |
| 6 | |
3607 |
| 7 | |
3381 |
| 8 | |
3373 |
| 9 | |
3371 |
| 10 | |
3370 |
<a href="https://youtube.com/live/6kyPalDSI4c"><img src="https://img.atcoder.jp/carousel/awtf2026algo-english.png" class="img-responsive center-block" style="max-width: 100%"></a>
<a href="https://youtube.com/live/R9DAkDF5gIs"><img src="https://img.atcoder.jp/carousel/awtf2026heuristic-english.png" class="img-responsive center-block" style="max-width: 100%"></a>
| Category | Start Time | Next Contest |
|---|---|---|
| ABC |
◉ AtCoder Beginner Contest 467 |
|
| ARC |
◉ AtCoder Regular Contest 225 |
|
| AGC | TBD | |
| AHC |
◉ estie Programming Contest 2026 (AtCoder Heuristic Contest 068) |
|
| AWC |
◉ AtCoder Weekday Contest 0116 Beta |
|
Important announcements
- [2026-06-29] Notice Regarding the Sale of AtCoder User Submissions to AI Companies and Updates to the Terms of Service and Privacy Policy
- [2026-06-24] Planned Changes to the Generative AI Rules for AHC
- [2026-06-16] Language Update: C++23 (GCC 15.2.0)
- [2026-03-18] AGC Proctoring Rules
- [2026-02-20] Changes to ARC in 2026
- [2026-01-09] Announcement of AtCoder World Tour Finals 2027
- [2025-10-31] Launch of the New Judge System
- [2025-10-19] Postponement of the New Judge System Launch
- [2025-10-17] Launch of the New Judge System
- [2025-10-03] Regarding Rule Changes in ABC, ARC and AGC Due to Technological Advancement of Generative AI
- [2025-06-16] Introduction of Generative AI Rules in AHC
- [2025-04-17] Regarding Judge Queue Delays and Future Measures
- [2025-03-19] Changes to the Rated Cap of ARC Div.1
- [2024-12-27] AHC's New Rating System
- [2025-01-15] Tentative 2025 AHC Schedule
- [2025-01-15] Announcement of AtCoder World Tour Finals 2026
- [2016-07-20] Information
- [2024-12-04] Password Management for Your AtCoder Account
- [2024-12-02] Announcement Regarding ARC's Division System
- [2024-07-29] Restructuring of contests
Recent announcements
- [2026-07-17] New AtCoder Regular Contest 225 Announcement
- [2026-07-17] New AtCoder Beginner Contest 467 Announcement
- [2026-07-17] New estie Programming Contest 2026 (AtCoder Heuristic Contest 068) Announcement
- [2026-07-10] AtCoder Regular Contest-- 224 Announcement
- [2026-07-10] AtCoder Beginner Contest 466 Announcement
We will hold <a href="https://atcoder.jp/contests/arc225">AtCoder Regular Contest 225</a>.
- Contest URL: https://atcoder.jp/contests/arc225
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260719T2100&p1=248
- Duration: 120 minutes
- Writer: <img src="//img.atcoder.jp/assets/user/user-yellow-1.png" class="user-rating-stage-m"><a href="/users/milkcoffee" class="username"><span class="user-yellow">milkcoffee</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/icon/crown_bronze.png"> <a href="/users/maspy" class="username"><span class="user-red">maspy</span></a>
- Rated range: 1200 ~ 2799
- Point Values: 500-600-600-600-900
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/abc467">AtCoder Beginner Contest 467</a>.
- Contest URL: https://atcoder.jp/contests/abc467
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260718T2100&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/vwxyz" class="username"><span class="user-orange">vwxyz</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>
- Tester: <img src="//img.atcoder.jp/assets/user/user-orange-3.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/sounansya" class="username"><span class="user-orange">sounansya</span></a>
- Rated range: ~ 1999
- The point values: 100-200-300-425-450-525-625
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/ahc068">estie Programming Contest 2026 (AtCoder Heuristic Contest 068)</a>.
- Contest URL: https://atcoder.jp/contests/ahc068
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260718T1500&p1=248
- Duration: 4 hours
- Writer: <a href="/users/wata_admin" class="username"><span class="user-unrated">wata_admin</span></a>
- Rated range: All (Heuristic Rating)
This contest is one of the qualifying contests for <a href="https://atcoder.jp/posts/1636">AWTF 2027</a>.
<b>
This will be the final short contest to which the current generative AI rules apply. Starting with the next short contest, the new generative AI rules will take effect.
We have also posted important information regarding the use of generative AI on the top page and at the end of the problem statement. Please make sure to read it.
</b>
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/arc224">AtCoder Regular Contest-- 224</a>.
- Contest URL: https://atcoder.jp/contests/arc224
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260712T2100&p1=248
- Duration: 120 minutes
- Writer: <img src="//img.atcoder.jp/assets/user/user-orange-3.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-yellow-2.png" class="user-rating-stage-m"><a href="/users/ynymxiaolongbao" class="username"><span class="user-yellow">ynymxiaolongbao</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-3.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-1.png" class="user-rating-stage-m"><a href="/users/physics0523" class="username"><span class="user-orange">physics0523</span></a>
- Rated range: 800 ~ 2399
- Point Values: 300-400-500-500-500-700
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/abc466">AtCoder Beginner Contest 466</a>.
- Contest URL: https://atcoder.jp/contests/abc466
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260711T2100&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/mechanicalpenciI" class="username"><span class="user-orange">mechanicalpenciI</span></a>, <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/cn449" class="username"><span class="user-red">cn449</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-2.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-1.png" class="user-rating-stage-m"><a href="/users/kyopro_friends" class="username"><span class="user-orange">kyopro_friends</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-3.png" class="user-rating-stage-m"><a href="/users/harurun4635" class="username"><span class="user-orange">harurun4635</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-3.png" class="user-rating-stage-m"><a href="/users/sheyasutaka" class="username"><span class="user-orange">sheyasutaka</span></a>
- Rated range: ~ 1999
- The point values: 100-200-300-400-450-500-600
We are looking forward to your participation!