Contest
Active Contests
| Start Time | Contest Name |
|---|---|
| ◉ THIRD Programming Contest 2026(AtCoder Heuristic Contest 061) | |
| ◉ AtCoder Beginner Contest 446 |
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 0011 Beta |
Ranking: Algorithm
| User | Rating | |
|---|---|---|
| 1 | |
3782 |
| 2 | |
3715 |
| 3 | |
3659 |
| 4 | |
3629 |
| 5 | |
3612 |
| 6 | |
3610 |
| 7 | |
3411 |
| 8 | |
3381 |
| 9 | |
3373 |
| 10 | |
3371 |
Important announcements
- [2026-02-20] New 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
- [2026-02-20] New AtCoder Regular Contest 215 Announcement
- [2026-02-20] New AtCoder Beginner Contest 446 Announcement
- [2026-02-13] AtCoder Beginner Contest 445 Announcement
- [2026-02-12] THIRD Programming Contest 2026(AtCoder Heuristic Contest 061) Announcement
- [2026-02-06] AtCoder Regular Contest 214 Announcement
We will hold <a href="https://atcoder.jp/contests/arc215">AtCoder Regular Contest 215</a>.
- Contest URL: https://atcoder.jp/contests/arc215
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260222T2100&p1=248
- Duration: 120 minutes
- Writer: <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>
- 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: 500-500-600-600-700-700
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/abc446">AtCoder Beginner Contest 446</a>.
- Contest URL: https://atcoder.jp/contests/abc446
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260221T2100&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/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>, <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-1.png" class="user-rating-stage-m"><a href="/users/sounansya" class="username"><span class="user-orange">sounansya</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/kyopro_friends" class="username"><span class="user-orange">kyopro_friends</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/abc445">AtCoder Beginner Contest 445</a>.
- Contest URL: https://atcoder.jp/contests/abc445
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260214T2100&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/KumaTachiRen" class="username"><span class="user-orange">KumaTachiRen</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-1.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-3.png" class="user-rating-stage-m"><a href="/users/sheyasutaka" class="username"><span class="user-orange">sheyasutaka</span></a>
- Tester: <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>, <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/yuto1115" class="username"><span class="user-red">yuto1115</span></a>
- Rated range: ~ 1999
- The point values: 100-200-300-425-475-500-600
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/ahc061">THIRD Programming Contest 2026(AtCoder Heuristic Contest 061)</a>.
- Contest URL: https://atcoder.jp/contests/ahc061
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260213T1900&p1=248
- Duration: 10 days
- Writer: <img src="//img.atcoder.jp/assets/icon/crown_gold.png"> <a href="/users/Shun_PI" class="username"><span class="user-red">Shun_PI</span></a></li>
- Rated range: All (Heuristic Rating)
This contest is one of the qualifying contests for <a href="https://atcoder.jp/posts/1635">AWTF 2027</a>.
We are looking forward to your participation!
We will hold <a href="https://atcoder.jp/contests/arc214">AtCoder Regular Contest 214</a>.
- Contest URL: https://atcoder.jp/contests/arc214
- Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260208T2100&p1=248
- Duration: 120 minutes
- Writer: <img src="//img.atcoder.jp/assets/icon/crown_silver.png"> <a href="/users/snuke" class="username"><span style="color:#1000AC;">snuke</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: 300-500-600-700-700-900
We are looking forward to your participation!