Post Archive - AtCoder

AtCoder World Tour Finals 2026 Algorithm Announcement (with Unrated Mirror)

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We will hold AtCoder World Tour Finals 2026 Algorithm. - Contest URL: https://atcoder.jp/contests/awtf2026algo - Mirror Contest URL: https://atcoder.jp/contests/awtf2026algo-open - Start Time: https://www.timeanddate.com/worldclock/fixedtime.html?iso=20260709T1100&p1=248 - Duration: 420 minutes - Number of Tasks: 5 - Writer: <a href="/user/maroonrk" class="username">maroonrk</a> - Tester: <img src="//img.atcoder.jp/assets/icon/crown_silver.png"> <a href="/user/hos_lyric" class="username">hos_lyric</a>, <img src="//img.atcoder.jp/assets/icon/crown_silver.png"> <a href="/user/tatyam" class="username">tatyam</a>, <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/user/maspy" class="username">maspy</a>, <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/user/yosupo" class="username">yosupo</a>, <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/user/sigma425" class="username">sigma425</a> - Rated range: Unrated The point values will be 900-900-1500-2500-2500. We don't freeze the standings in the contest. AtCoder World Tour Finals 2026 is an international onsite contest. We have invited top-runners of AtCoder Race Ranking 2025 to Tokyo. This year, as an exhibition match, an AI agent from OpenAI will also participate in the contest. On the contest day, we will stream the contest on our YouTube channel. For more details, please visit this page (https://info.atcoder.jp/more/contents/awtf/2026). The mirror contest is Unrated and the standings is hidden. Other rules are the same as AGC.

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AtCoder Beginner Contest 465 Announcement

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We will hold <a href="https://atcoder.jp/contests/abc465">AtCoder Beginner Contest 465</a>. - Contest URL: https://atcoder.jp/contests/abc465 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260704T2100&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">sheyasutaka</a>, <img src="//img.atcoder.jp/assets/user/user-orange-2.png" class="user-rating-stage-m"><a href="/users/sounansya" class="username">sounansya</a> - Tester: <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/KumaTachiRen" class="username">KumaTachiRen</a> - Rated range: ~ 1999 - The point values: 100-200-300-400-450-525-625 We are looking forward to your participation!

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AtCoder Regular Contest 223 Announcement

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We will hold <a href="https://atcoder.jp/contests/arc223">AtCoder Regular Contest 223</a>. - Contest URL: https://atcoder.jp/contests/arc223 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260628T2100&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/vwxyz" class="username">vwxyz</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: 400-500-500-600-700-800 We are looking forward to your participation!

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Japanese Student Championship 2026 -Advance- Qualification (AtCoder Beginner Contest 464) Announcement

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We will hold <a href="https://atcoder.jp/contests/abc464">Japanese Student Championship 2026 -Advance- Qualification (AtCoder Beginner Contest 464)</a>. - Contest URL: https://atcoder.jp/contests/abc464 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260627T2100&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/harurun4635" class="username">harurun4635</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>, <a href="/users/evima" class="username">evima</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/user/user-orange-1.png" class="user-rating-stage-m"><a href="/users/vwxyz" class="username">vwxyz</a> - Rated range: ~ 1999 - The point values: 100-200-300-400-450-550-625 We are looking forward to your participation!

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AtCoder Heuristic Contest 067 Announcement

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We will hold <a href="https://atcoder.jp/contests/ahc067">AtCoder Heuristic Contest 067</a>. - Contest URL: https://atcoder.jp/contests/ahc067 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260621T1900&p1=248 - Duration: 4 hours - Writer: <a href="/users/wata_admin" class="username">wata_admin</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!

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AtCoder Beginner Contest 463 Announcement

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We will hold <a href="https://atcoder.jp/contests/abc463">AtCoder Beginner Contest 463</a>. - Contest URL: https://atcoder.jp/contests/abc463 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260620T2100&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/KumaTachiRen" class="username">KumaTachiRen</a>, <img src="//img.atcoder.jp/assets/user/user-yellow-4.png" class="user-rating-stage-m"><a href="/users/MMNMM" class="username">MMNMM</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: 100-200-300-400-450-500-600 We are looking forward to your participation!

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AtCoder Regular Contest 222 Announcement

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We will hold <a href="https://atcoder.jp/contests/arc222">AtCoder Regular Contest 222</a>. - Contest URL: https://atcoder.jp/contests/arc222 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260614T2100&p1=248 - Duration: 120 minutes - Writer: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/maspy" class="username">maspy</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> - Rated range: 1200 ~ 2799 - Point Values: 300-500-700-700-700-700 We are looking forward to your participation!

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CodeQUEEN 2026 -qual- (AtCoder Beginner Contest 462) Announcement

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We will hold <a href="https://atcoder.jp/contests/abc462">CodeQUEEN 2026 -qual- (AtCoder Beginner Contest 462)</a>. - Contest URL: https://atcoder.jp/contests/abc462 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260613T2100&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>, <a href="/users/evima" class="username">evima</a>, <img src="//img.atcoder.jp/assets/user/user-orange-4.png" class="user-rating-stage-m"><a href="/users/mechanicalpenciI" class="username">mechanicalpenciI</a> - Tester: <img src="//img.atcoder.jp/assets/user/user-orange-4.png" class="user-rating-stage-m"><a href="/users/harurun4635" class="username">harurun4635</a>, <img src="//img.atcoder.jp/assets/user/user-yellow-4.png" class="user-rating-stage-m"><a href="/users/physics0523" class="username">physics0523</a>, <img src="//img.atcoder.jp/assets/user/user-orange-2.png" class="user-rating-stage-m"><a href="/users/sounansya" class="username">sounansya</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 Beginner Contest 461 Announcement

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We will hold <a href="https://atcoder.jp/contests/abc461">AtCoder Beginner Contest 461</a>. - Contest URL: https://atcoder.jp/contests/abc461 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260606T2100&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">vwxyz</a>, <a href="/users/evima" class="username">evima</a>, <img src="//img.atcoder.jp/assets/user/user-yellow-4.png" class="user-rating-stage-m"><a href="/users/physics0523" class="username">physics0523</a> - Tester: <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-yellow-4.png" class="user-rating-stage-m"><a href="/users/physics0523" class="username">physics0523</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: ~ 1999 - The point values: 100-200-300-425-475-500-625 We are looking forward to your participation!

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AtCoder Regular Contest++ 221 Announcement

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We will hold <a href="https://atcoder.jp/contests/arc221">AtCoder Regular Contest++ 221</a>. - Contest URL: https://atcoder.jp/contests/arc221 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260531T2100&p1=248 - Duration: 150 minutes - Writer: <img src="//img.atcoder.jp/assets/icon/crown_silver.png"> <a href="/users/tatyam" class="username">tatyam</a>, <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/toam" class="username">toam</a>, <img src="//img.atcoder.jp/assets/user/user-orange-3.png" class="user-rating-stage-m"><a href="/users/noya2" class="username">noya2</a>, <img src="//img.atcoder.jp/assets/user/user-orange-3.png" class="user-rating-stage-m"><a href="/users/hirayuu_At" class="username">hirayuu_At</a> - Rated range: 1600 ~ 2999 - Point Values: 600-800-800-800-1000 We are looking forward to your participation!

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