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.

We will hold <a href="https://atcoder.jp/contests/arc204">AtCoder Regular Contest 204 (Div. 1)</a>. - Contest URL: https://atcoder.jp/contests/arc204 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250817T2100&p1=248 - Duration: 150 minutes - Number of Tasks: 4 - Writer: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/potato167" class="username"><span class="user-red">potato167</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: 1600 ~ 2999 The point values will be 700-800-900-1000. We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/abc419">AtCoder Beginner Contest 419</a>. - Contest URL: https://atcoder.jp/contests/abc419 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250816T2100&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/toam" class="username"><span class="user-orange">toam</span></a>, <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/chokudai" class="username"><span class="user-red">chokudai</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: 100-200-300-400-475-550-600 We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/abc418">AtCoder Beginner Contest 418</a>. - Contest URL: https://atcoder.jp/contests/abc418 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250809T2100&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/Nyaan" class="username"><span class="user-orange">Nyaan</span></a>, <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> - 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/icon/crown_bronze.png"> <a href="/users/yuto1115" class="username"><span class="user-red">yuto1115</span></a> - Rated range: ~ 1999 - The point values: 100-200-350-425-475-550-650 We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/arc203">AtCoder Regular Contest 203 (Div. 2)</a>. - Contest URL: https://atcoder.jp/contests/arc203 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250803T2100&p1=248 - Duration: 120 minutes - Number of Tasks: 5 - 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 ~ 2399 The point values will be 400-500-600-800-800. We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/abc417">AtCoder Beginner Contest 417</a>. - Contest URL: https://atcoder.jp/contests/abc417 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250802T2100&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-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/icon/crown_silver.png"> <a href="/users/tatyam" class="username"><span class="user-red">tatyam</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-1.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: 100-200-300-425-475-500-625 We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/ahc051">THIRD Programming Contest 2025 Summer（AtCoder Heuristic Contest 051）</a>. - Contest URL: https://atcoder.jp/contests/ahc051 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20250801T1900&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!