Post Archive - AtCoder

AtCoder Beginner Contest 474 Announcement

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We will hold <a href="https://atcoder.jp/contests/abc474">AtCoder Beginner Contest 474</a>. - Contest URL: https://atcoder.jp/contests/abc474 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260906T1310&p1=248 (Irregular start time!) - Duration: 100 minutes - Writer: <img src="//img.atcoder.jp/assets/user/user-orange-3.png" class="user-rating-stage-m"><a href="/users/sounansya" class="username">sounansya</a>, <img src="//img.atcoder.jp/assets/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/vwxyz" class="username">vwxyz</a> - Tester: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/harurun4635" class="username">harurun4635</a>, <img src="//img.atcoder.jp/assets/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/KumaTachiRen" class="username">KumaTachiRen</a> - Rated range: ~ 1999 - The point values: 100-200-300-400-450-500-575 We are looking forward to your participation!

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AtCoder Regular Contest-- 229 Announcement

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We will hold <a href="https://atcoder.jp/contests/arc229">AtCoder Regular Contest-- 229</a>. - Contest URL: https://atcoder.jp/contests/arc229 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260905T2100&p1=248 - Duration: 120 minutes - Writer: <img src="//img.atcoder.jp/assets/user/user-orange-3.png" class="user-rating-stage-m"><a href="/users/sounansya" class="username">sounansya</a>, <img src="//img.atcoder.jp/assets/user/user-orange-4.png" class="user-rating-stage-m"><a href="/users/Nyaan" class="username">Nyaan</a>, <img src="//img.atcoder.jp/assets/icon/crown_silver.png"> <a href="/users/snuke" class="username">snuke</a> - Tester: <img src="//img.atcoder.jp/assets/user/user-orange-3.png" class="user-rating-stage-m"><a href="/users/sounansya" class="username">sounansya</a>, <img src="//img.atcoder.jp/assets/user/user-orange-4.png" class="user-rating-stage-m"><a href="/users/Nyaan" class="username">Nyaan</a> - Rated range: 800 ~ 2399 - Point Values: 400-500-500-600-600-600 We are looking forward to your participation!

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AtCoder Regular Contest++ 228 Announcement

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We will hold <a href="https://atcoder.jp/contests/arc228">AtCoder Regular Contest++ 228</a>. - Contest URL: https://atcoder.jp/contests/arc228 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260830T2100&p1=248 - Duration: 150 minutes - Writer: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/PCTprobability" class="username">PCTprobability</a> - Tester: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/maspy" class="username">maspy</a>, <img src="//img.atcoder.jp/assets/user/user-orange-4.png" class="user-rating-stage-m"><a href="/users/Nyaan" class="username">Nyaan</a> - Rated range: 1600 ~ 2999 - Point Values: 800-800-900-1000-1200 We are looking forward to your participation!

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AtCoder Beginner Contest 473 Announcement

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We will hold <a href="https://atcoder.jp/contests/abc473">AtCoder Beginner Contest 473</a>. - Contest URL: https://atcoder.jp/contests/abc473 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260829T2100&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">MMNMM</a>, <img src="//img.atcoder.jp/assets/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/physics0523" class="username">physics0523</a>, <img src="//img.atcoder.jp/assets/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/vwxyz" class="username">vwxyz</a>, <img src="//img.atcoder.jp/assets/user/user-orange-3.png" class="user-rating-stage-m"><a href="/users/sheyasutaka" class="username">sheyasutaka</a> - Tester: <img src="//img.atcoder.jp/assets/user/user-orange-3.png" class="user-rating-stage-m"><a href="/users/sheyasutaka" class="username">sheyasutaka</a>, <img src="//img.atcoder.jp/assets/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/kyopro_friends" class="username">kyopro_friends</a> - Rated range: ~ 1999 - The point values: 100-200-300-400-450-525-600 We are looking forward to your participation!

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13th Asprova Programming Contest（AtCoder Heuristic Contest 070） Announcement

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We will hold <a href="https://atcoder.jp/contests/ahc070">13th Asprova Programming Contest（AtCoder Heuristic Contest 070）</a>. - Contest URL: https://atcoder.jp/contests/ahc070 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260829T1500&p1=248 - Duration: 4 hours - Writer：<a href="https://atcoder.jp/users/HNN_8127?contestType=heuristic" class="username">HNN_8127</a> - Tester: <a href="https://atcoder.jp/users/iaNTU?contestType=algo" class="username">iaNTU</a>, <a href="https://atcoder.jp/users/Koi51?contestType=heuristic" class="username">Koi51</a>, <a href="https://atcoder.jp/users/kozima?contestType=heuristic" class="username">kozima</a>, <a href="https://atcoder.jp/users/mya3?contestType=heuristic" class="username">mya3</a>, and others. - Rated range: All (Heuristic Rating) This contest is one of the qualifying contests for <a href="https://atcoder.jp/posts/1636">AWTF 2027</a>. Starting with this short contest, the use of generative AI will be prohibited, with limited exceptions. Please refer to <a href="https://atcoder.jp/posts/short-ahc-llm-rules-en">this post</a> for further details. We are looking forward to your participation!

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AtCoder Beginner Contest 472 Announcement

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We will hold <a href="https://atcoder.jp/contests/abc472">AtCoder Beginner Contest 472</a>. - Contest URL: https://atcoder.jp/contests/abc472 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260822T2100&p1=248 - Duration: 100 minutes - Writer: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/harurun4635" class="username">harurun4635</a>, <img src="//img.atcoder.jp/assets/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/KumaTachiRen" class="username">KumaTachiRen</a>, <img src="//img.atcoder.jp/assets/user/user-orange-3.png" class="user-rating-stage-m"><a href="/users/sheyasutaka" class="username">sheyasutaka</a> - Tester: <img src="//img.atcoder.jp/assets/user/user-orange-4.png" class="user-rating-stage-m"><a href="/users/mechanicalpenciI" class="username">mechanicalpenciI</a>, <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/cn449" class="username">cn449</a> - Rated range: ~ 1999 - The point values: 100-200-300-400-450-525-600 We are looking forward to your participation!

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AtCoder Regular Contest 227 Announcement

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We will hold <a href="https://atcoder.jp/contests/arc227">AtCoder Regular Contest 227</a>. - Contest URL: https://atcoder.jp/contests/arc227 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260816T2100&p1=248 - Duration: 120 minutes - Writer: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/yosupo" class="username">yosupo</a> - Tester: <img src="//img.atcoder.jp/assets/user/user-orange-4.png" class="user-rating-stage-m"><a href="/users/Nyaan" class="username">Nyaan</a>, <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/sigma425" class="username">sigma425</a> - Rated range: 1200 ~ 2799 - Point Values: 400-500-700-700-700-800 We are looking forward to your participation!

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AtCoder Beginner Contest 471 Announcement

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We will hold <a href="https://atcoder.jp/contests/abc471">AtCoder Beginner Contest 471</a>. - Contest URL: https://atcoder.jp/contests/abc471 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260815T2100&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">kyopro_friends</a>, <img src="//img.atcoder.jp/assets/user/user-orange-3.png" class="user-rating-stage-m"><a href="/users/sheyasutaka" class="username">sheyasutaka</a> - Tester: <img src="//img.atcoder.jp/assets/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/vwxyz" class="username">vwxyz</a>, <img src="//img.atcoder.jp/assets/user/user-orange-2.png" class="user-rating-stage-m"><a href="/users/physics0523" class="username">physics0523</a> - Rated range: ~ 1999 - The point values: 100-200-300-400-450-550-600 We are looking forward to your participation!

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UNIQUE VISION Programming Contest 2026 Summer (AtCoder Regular Contest 226) Announcement

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We will hold <a href="https://atcoder.jp/contests/arc226">UNIQUE VISION Programming Contest 2026 Summer (AtCoder Regular Contest 226)</a>. - Contest URL: https://atcoder.jp/contests/arc226 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260809T2100&p1=248 - Duration: 120 minutes - Writer: <img src="//img.atcoder.jp/assets/icon/crown_silver.png"> <a href="/users/snuke" class="username">snuke</a> - Tester: <img src="//img.atcoder.jp/assets/user/user-orange-4.png" class="user-rating-stage-m"><a href="/users/Nyaan" class="username">Nyaan</a>, <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/maspy" class="username">maspy</a> - Rated range: 1200 ~ 2799 - Point Values: 400-500-700-800-1000 We are looking forward to your participation!

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JPRS Programming Contest 2026#2 (AtCoder Beginner Contest 470) Announcement

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We will hold <a href="https://atcoder.jp/contests/abc470">JPRS Programming Contest 2026#2 (AtCoder Beginner Contest 470)</a>. - Contest URL: https://atcoder.jp/contests/abc470 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260808T2100&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/sounansya" class="username">sounansya</a>, <img src="//img.atcoder.jp/assets/user/user-orange-3.png" class="user-rating-stage-m"><a href="/users/sheyasutaka" class="username">sheyasutaka</a>, <img src="//img.atcoder.jp/assets/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/kyopro_friends" class="username">kyopro_friends</a> - Tester： <img src="//img.atcoder.jp/assets/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/vwxyz" class="username">vwxyz</a></a> - Rated range: ~ 1999 - The point values: 100-200-300-400-450-500-600 We are looking forward to your participation!

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