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 0101 Beta |
Ranking: Algorithm
| User | Rating | |
|---|---|---|
| 1 |   tourist |
3797 |
| 2 |   ksun48 |
3670 |
| 3 |  zhoukangyang |
3659 |
| 4 | newbiedmy |
3629 |
| 5 |  ecnerwala |
3619 |
| 6 | jiangly |
3607 |
| 7 | tour1st |
3381 |
| 8 |  mulgokizary |
3373 |
| 9 |  Radewoosh |
3371 |
| 10 |  turmax |
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 |
◉ Japanese Student Championship 2026 -Advance- Qualification (AtCoder Beginner Contest 464) |
|
| ARC |
◉ AtCoder Regular Contest 223 |
|
| AGC |
◉ World Tour Finals 2026 Algorithm ◉ World Tour Finals 2026 Algorithm（Open Contest） |
|
| AHC |
◉ World Tour Finals 2026 Heuristic |
|
| AWC |
◉ AtCoder Weekday Contest 0101 Beta |
Important announcements
- [2026-06-24] New 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
- [2026-06-26] New AtCoder Regular Contest 223 Announcement
- [2026-06-26] New Japanese Student Championship 2026 -Advance- Qualification (AtCoder Beginner Contest 464) Announcement
- [2026-06-19] AtCoder Heuristic Contest 067 Announcement
- [2026-06-19] AtCoder Beginner Contest 463 Announcement
- [2026-06-12] AtCoder Regular Contest 222 Announcement
We will hold <a href="https://atcoder.jp/contests/arc223">AtCoder Regular Contest 223</a>.
- Contest URL: https://atcoder.jp/contests/arc223
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260628T2100&p1=248
- Duration: 120 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>
- 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: 400-500-500-600-700-800
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/abc464">Japanese Student Championship 2026 -Advance- Qualification (AtCoder Beginner Contest 464)</a>.
- Contest URL: https://atcoder.jp/contests/abc464
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260627T2100&p1=248
- Duration: 100 minutes
- Writer: <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-1.png" class="user-rating-stage-m"><a href="/users/physics0523" class="username"><span class="user-orange">physics0523</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-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/vwxyz" class="username"><span class="user-orange">vwxyz</span></a>
- Rated range: ~ 1999
- The point values: 100-200-300-400-450-550-625
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/ahc067">AtCoder Heuristic Contest 067</a>.
- Contest URL: https://atcoder.jp/contests/ahc067
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260621T1900&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>.
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/abc463">AtCoder Beginner Contest 463</a>.
- Contest URL: https://atcoder.jp/contests/abc463
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260620T2100&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/KumaTachiRen" class="username"><span class="user-orange">KumaTachiRen</span></a>, <img src="//img.atcoder.jp/assets/user/user-yellow-4.png" class="user-rating-stage-m"><a href="/users/MMNMM" class="username"><span class="user-yellow">MMNMM</span></a>
- Tester: <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>
- Rated range: ~ 1999
- The point values: 100-200-300-400-450-500-600
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/arc222">AtCoder Regular Contest 222</a>.
- Contest URL: https://atcoder.jp/contests/arc222
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260614T2100&p1=248
- Duration: 120 minutes
- Writer: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/maspy" class="username"><span class="user-red">maspy</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>
- Rated range: 1200 ~ 2799
- Point Values: 300-500-700-700-700-700
We are looking forward to your participation!