We will hold <a href="https://atcoder.jp/contests/ahc074">HACK TO THE FUTURE 2027 (AtCoder Heuristic Contest 074)</a>. - Contest URL: https://atcoder.jp/contests/ahc074 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261030T1900&p1=248 - Duration: 10 days - Division Change Deadline: Within 48 hours after the contest starts. - 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 contest will be held in two divisions: the Human only division, where the use of generative AI is prohibited, and the With AI division, where generative AI can be used freely.</b> For details, please see <a href='https://atcoder.jp/posts/long-ahc-divisions-2026_en'>Format of Upcoming Long-Term AtCoder Heuristic Contests (AHC)</a> Whether you're looking to make greater use of generative AI or prefer to tackle challenges without relying on it, we look forward to your participation!

We will hold <a href="https://atcoder.jp/contests/arc233">AtCoder Regular Contest++ 233</a>. - Contest URL: https://atcoder.jp/contests/arc233 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261025T2100&p1=248 - Duration: 150 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: 1600 ~ 2999 - Point Values: 700-900-900-900 We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/abc481">SMBC Programming Contest #2 (AtCoder Beginner Contest 481）</a>. - Contest URL: https://atcoder.jp/contests/abc481 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261024T2100&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/sheyasutaka" class="username"><span class="user-orange">sheyasutaka</span></a>, <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/harurun4635" class="username"><span class="user-red">harurun4635</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> - Tester: <img src="//img.atcoder.jp/assets/user/user-yellow-4.png" class="user-rating-stage-m"><a href="/users/physics0523" class="username"><span class="user-yellow">physics0523</span></a>, <img src="//img.atcoder.jp/assets/user/user-orange-3.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: 100-200-300-400-450-525-600 We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/abc480">AtCoder Beginner Contest 480</a>. - Contest URL: https://atcoder.jp/contests/abc480 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261017T2100&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-1.png" class="user-rating-stage-m"><a href="/users/kyopro_friends" class="username"><span class="user-orange">kyopro_friends</span></a> - Tester: <img src="//img.atcoder.jp/assets/user/user-yellow-3.png" class="user-rating-stage-m"><a href="/users/MMNMM" class="username"><span class="user-yellow">MMNMM</span></a>, <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> - Rated range: ~ 1999 - The point values: 100-200-300-400-450-525-600 We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/ahc073">AtCoder Heuristic Contest 073</a>. - Contest URL: https://atcoder.jp/contests/ahc073 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261017T1500&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 the <a href="https://atcoder.jp/contests/ahc_genai_test_2026">AHC GenAI Rules Trial Contest 2026</a> to evaluate proposed generative AI usage rules for future long-term AtCoder Heuristic Contests (AHCs). - Contest Page: https://atcoder.jp/contests/ahc_genai_test_2026 - Start Time: <a href="http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261015T1900&p1=248">http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261015T1900&p1=248</a> - Duration: 3 days - Writer: <a href="/users/wata_admin" class="username"><span class="user-unrated">wata_admin</span></a> - Unrated, no GP30 points Through this trial, we aim to evaluate the clarity and practicality of the rules, as well as their impact on the competitive experience. We encourage you to participate in the contest and would greatly appreciate your feedback through the Registration form!

We will hold <a href="https://atcoder.jp/contests/abc479">AtCoder Beginner Contest 479</a>. - Contest URL: https://atcoder.jp/contests/abc479 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261011T2100&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/physics0523" class="username"><span class="user-orange">physics0523</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> - 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: ~ 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/arc232">AtCoder Regular Contest++ 232</a>. - Contest URL: https://atcoder.jp/contests/arc232 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261010T2100&p1=248 - Duration: 150 minutes - Writer: <a href="/users/maroonrk" class="username"><span style="color:#869120;">maroonrk</span></a> - Tester: <img src="//img.atcoder.jp/assets/icon/crown_silver.png"> <a href="/users/snuke" class="username"><span style="color:#1000AC;">snuke</span></a>, <a href="/users/blackyuki" class="username"><span class="user-red">blackyuki</span></a> - Rated range: 1600 ~ 2999 - Point Values: 800-800-800-800-1100 We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/arc231">AtCoder Regular Contest 231</a>. - Contest URL: https://atcoder.jp/contests/arc231 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261004T2100&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/Mitsubachi" class="username"><span class="user-orange">Mitsubachi</span></a> - Tester: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/Nyaan" class="username"><span class="user-red">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: 500-500-600-700-800-800 We are looking forward to your participation!

We will hold <a href="https://atcoder.jp/contests/abc478">AtCoder Beginner Contest 478</a>. - Contest URL: https://atcoder.jp/contests/abc478 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20261003T2100&p1=248 - Duration: 100 minutes - Writer: <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>, <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/icon/crown_bronze.png"> <a href="/users/toam" class="username"><span class="user-red">toam</span></a> - Tester: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <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/kyopro_friends" class="username"><span class="user-orange">kyopro_friends</span></a> - Rated range: ~ 1999 - The point values: 100-200-300-400-475-525-625 We are looking forward to your participation!