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Permanent Contests

First-time users: practice contest / Library testing: AtCoder Library Practice Contest

Daily Contests

Start Time Contest Name
◉ AtCoder Weekday Contest 0156 Beta

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8 asi1024 3164
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Category Start Time Next Contest
ABC ◉ AtCoder Beginner Contest 475
ARC ◉ AtCoder Regular Contest++ 230
AGC ◉ AtCoder Grand Contest 078
AHC ◉ AtCoder Heuristic Contest 071
AWC ◉ AtCoder Weekday Contest 0156 Beta

Important announcements

Recent announcements

AtCoder Heuristic Contest 071 Announcement

posted:
We will hold <a href="https://atcoder.jp/contests/ahc071">AtCoder Heuristic Contest 071</a>. - Contest URL: https://atcoder.jp/contests/ahc071 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260913T1900&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!
last update:

AtCoder Beginner Contest 475 Announcement

posted:
We will hold <a href="https://atcoder.jp/contests/abc475">AtCoder Beginner Contest 475</a>. - Contest URL: https://atcoder.jp/contests/abc475 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20260912T2100&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/cn449" class="username"><span class="user-red">cn449</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-yellow-4.png" class="user-rating-stage-m"><a href="/users/MMNMM" class="username"><span class="user-yellow">MMNMM</span></a> - Rated range: ~ 1999 - The point values: 100-200-300-400-475-525-575 We are looking forward to your participation!
last update:

AtCoder Beginner Contest 474 Announcement

posted:
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 <font color="red">(Irregular start time!)</font> - 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"><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/vwxyz" class="username"><span class="user-orange">vwxyz</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/KumaTachiRen" class="username"><span class="user-orange">KumaTachiRen</span></a> - Rated range: ~ 1999 - The point values: 100-200-300-400-450-500-575 We are looking forward to your participation!
last update:

AtCoder Regular Contest-- 229 Announcement

posted:
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"><span class="user-orange">sounansya</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/icon/crown_silver.png"> <a href="/users/snuke" class="username"><span style="color:#1000AC;">snuke</span></a> - Tester: <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>, <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: 800 ~ 2399 - Point Values: 400-500-500-600-600-600 We are looking forward to your participation!
last update:

AtCoder Regular Contest++ 228 Announcement

posted:
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"><span class="user-red">PCTprobability</span></a> - Tester: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/maspy" class="username"><span class="user-red">maspy</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: 1600 ~ 2999 - Point Values: 800-800-900-1000-1200 We are looking forward to your participation!
last update:

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