We will hold <a href="https://atcoder.jp/contests/abc424">AtCoder Beginner Contest 424</a>. - Contest URL: https://atcoder.jp/contests/abc424 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250920T2100&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-1.png" class="user-rating-stage-m"><a href="/users/kyopro_friends" class="username"><span class="user-orange">kyopro_friends</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-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/icon/crown_bronze.png"> <a href="/users/yuto1115" class="username"><span class="user-red">yuto1115</span></a> - Rated range: ~ 1999 - The point values: 100-200-300-425-475-525-625 We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/ahc054">ALGO ARTIS Programming Contest 2025 Summer（AtCoder Heuristic Contest 054）</a>. - Contest URL: https://atcoder.jp/contests/ahc054 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250919T1900&p1=248 - Duration: 10 days - 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/1394">AWTF 2026</a>. We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/abc423">AtCoder Beginner Contest 423</a>. - Contest URL: https://atcoder.jp/contests/abc423 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250914T2100&p1=248 - Duration: 100 minutes - Writer: <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-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/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: ~ 1999 - The point values: 150-200-300-400-475-525-600 We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/ahc053">12th Asprova Programming Contest（AtCoder Heuristic Contest 053）</a>. - Contest URL: https://atcoder.jp/contests/ahc053 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250913T1900&p1=248 - Duration: 4 hours - Writer：<img src="//img.atcoder.jp/assets/user/user-orange-2.png" class="user-rating-stage-m"><a href="/users/iaNTU" class="username"><span class="user-orange">iaNTU</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-2.png" class="user-rating-stage-m"><a href="/users/kozima" class="username"><span class="user-orange">kozima</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-3.png" class="user-rating-stage-m"><a href="/users/niuez" class="username"><span class="user-orange">niuez</span></a> - Rated range: All (Heuristic Rating) This contest is one of the qualifying contests for <a href="https://atcoder.jp/posts/1394">AWTF 2026</a>. We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/abc422">AtCoder Beginner Contest 422</a>. - Contest URL: https://atcoder.jp/contests/abc422 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250907T1310&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/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/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>, <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-3.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: 100-200-300-400-450-500-575 We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/arc205">AtCoder Regular Contest 205 (Div. 2)</a>. - Contest URL: https://atcoder.jp/contests/arc205 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250906T2100&p1=248 - Duration: 120 minutes - Number of Tasks: 5 - Writer: <img src="//img.atcoder.jp/assets/icon/crown_silver.png"> <a href="/users/snuke" class="username"><span style="color:#1000AC;">snuke</span></a> (proposal), <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> (prepare) - 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 ~ 2399 The point values will be 400-500-600-600-700. We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/abc421">AtCoder Beginner Contest 421</a>. - Contest URL: https://atcoder.jp/contests/abc421 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250830T2100&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/kyopro_friends" class="username"><span class="user-orange">kyopro_friends</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>, <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-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: 100-200-350-425-475-525-600 We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/abc420">AtCoder Beginner Contest 420</a>. - Contest URL: https://atcoder.jp/contests/abc420 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250824T2100&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/sounansya" class="username"><span class="user-orange">sounansya</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-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: 100-200-300-400-450-550-575 We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/ahc052">AtCoder Heuristic Contest 052</a>. - Contest URL: https://atcoder.jp/contests/ahc052 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250823T1500&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/1394">AWTF 2026</a>. We are looking forward to your participation!

Dear users, We are going to suspend our service on the following schedule for maintenance. 【Schedule】 - Start time: 2025-08-25 16:00:00 (UTC) - ~~End time: 2025-08-25 19:00:00 (UTC)~~ 17:14(UTC) 【Affected Resource】 - [https://atcoder.jp](https://atcoder.jp) We apologize for the inconvenience to our users. Thank you for your understanding.