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[How to get an account / participate in contests?](http://atcoder.jp/posts/2) [AtCoder's Contest Format](http://atcoder.jp/posts/1) [AtCoder's Testcases](https://www.dropbox.com/sh/nx3tnilzqz7df8a/AAAYlTq2tiEHl5hsESw6-yfLa?dl=0) - [AtCoder's Rating System](https://www.dropbox.com/sh/zpgcogxmmu84rr8/AADcw6o7M9tJFDgtpqEQQ46Ua?dl=0) - [AtCoder Race Ranking](https://img.atcoder.jp/file/GP30.html)

AtCoder Beginner Contest 180 Announcement

posted:
We will hold <a href="https://atcoder.jp/contests/abc180">AtCoder Beginner Contest 180</a>. - Contest URL: https://atcoder.jp/contests/abc180 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20201017T2000&p1=248 - Duration: 100 minutes - Number of Tasks: 6 - Writer: <a href="/users/kyopro_friends" class="username"><span class="user-orange">kyopro_friends</span></a>, <a href="/users/sheyasutaka" class="username"><span class="user-orange">sheyasutaka</span></a>, <a href="/users/ynymxiaolongbao" class="username"><span class="user-orange">ynymxiaolongbao</span></a> - Rated range: ~ 1999 The point values will be 100-200-300-400-500-600. We are looking forward to your participation!

AtCoder Regular Contest 105 Announcement

posted:
We will hold <a href="https://atcoder.jp/contests/arc105">AtCoder Regular Contest 105</a>. <font color="red">From this contest, you don't need to choose the option "(with ACL)" to submit solutions with ACL. (The library is installed by default.)</font> - Contest URL: https://atcoder.jp/contests/arc105 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20201011T2230&p1=248 - Duration: 100 minutes - Number of Tasks: 6 - Writer: <a href="/users/camypaper" class="username"><span class="user-orange">camypaper</span></a> - Rated range: ~ 2799 The point values will be 200-300-500-600-700-900. We are looking forward to your participation!

HHKB Programming Contest 2020 Announcement

posted:
We will hold <a href="https://atcoder.jp/contests/hhkb2020">HHKB Programming Contest 2020</a>. - Contest URL: https://atcoder.jp/contests/hhkb2020 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20201010T2100&p1=248 - Duration: 100 minutes - Number of Tasks: 6 - Writer: <img src="//img.atcoder.jp/assets/icon/crown_bronze.png"> <a href="/users/tozangezan" class="username"><span class="user-red">tozangezan</span></a> - Rated range: ~ 1999 The point values will be 100-200-300-400-500-600. We are looking forward to your participation!

AtCoder Regular Contest 104 Announcement

posted:
We will hold <a href="https://atcoder.jp/contests/arc104">AtCoder Regular Contest 104</a>. - Contest URL: https://atcoder.jp/contests/arc104 - Start Time: http://www.timeanddate.com/worldclock/fixedtime.html?iso=20201003T2100&p1=248 - Duration: 120 minutes - Number of Tasks: 6 - Writer: <a href="/users/satashun" class="username"><span class="user-orange">satashun</span></a> - Rated range: ~ 2799 The point values will be 100-400-600-700-700-1000. We are looking forward to your participation!

Reappearance of ARC

posted:
We will restart AtCoder Regular Contests in the following format: - 6 tasks - Duration: 100 or 120 minutes - Standard scores: - A: 100 or 200 points - B: 300 or 400 points - C: 500 points - D: 600 points - E: 700 points - F: 800 or 900 points (Depending on the tasks we have, sometimes the scores may be out of the bounds mentioned in the table above.) Formerly, ARC's $X$-point problems ($100 \leq X \leq 500$) were supposed to be harder than ABC's $X$-point problems. Now, we will standardize the scores, and new ARC's $X$-point problems will be as easy as ABC's $X$-point problems. However, the characteristics of problems may be different (ARC's problems will be more ad-hoc than ABC's). For AGCs, we won't change the scorings, so AGC's $X$-point problems will be harder than that of ARC/ABC's (just like now).

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