AtCoder is the largest algorithm competition website in Japan, with the domain name http://atcoder.jp/ (note that http://www.atcoder.jp/ is its official website). AtCoder supports Japanese and English.
AtCoder will have two games every Saturday at 20:00 Beijing time (21:00 JST), AtCoder Beginner Contest and AtCoder Regular Contest. These two competitions are played at the same time, and each contestant can only choose one of the two.
ABC is for algorithm beginners, and ARC is for people with a certain algorithm foundation.
Both ABC and ARC are four questions. ABC's C and D questions are exactly the same as ARC's A and B questions.
ARC benchmarks Codeforces Div2, which means that AtCoder's questions are less difficult than Codeforces.
Unlike Codeforces, AtCoder does not have a Final System Test, and contestants can know whether their program is correct after submitting the program.
TopCoder and Codeforces questions, as long as there is a test case that fails, you will not get points. The scoring mechanism of AtCoder is different. AtCoder has some questions. If you pass some of the test samples, you can get partial scores. For example, in question C of ARC 096 ( https://arc096.contest.atcoder.jp/tasks/arc096_b ), the value of N ranges from 1 to 10000. If the compiled program can pass the test cases of N<=100, you can Get 300 points, and pass all test cases, you can get a full score of 500 points.
ARC and ABC held at the same time, the number of ARC games = the number of ABC games + 1. For example, ABC 094 and ARC 095 are held at the same time, and ABC 095 and ARC 096 are held at the same time.
The harder the question on AtCoder, the higher the score, which is the same as TopCoder or Codeforces.
For example, ABC 094 has four questions with scores of 100, 200, 300, 400, and ARC 095 has four questions with scores of 300, 400, 700, and 900. Note that because the last two questions of ABC are the same as the first two questions of ARC, so are the scores.
For another example, ABC 095 scores 100, 200, 300, 500 for the four questions, and ARC 096 scores 300, 500, 900, and 900 for the four questions.
AtCoder's point calculation method is different from TopCoder and Coderforces. Those who have just participated in the AtCoder competition must have relatively low points. They need to participate in about ten games, and the points can reflect the level of the participants. Since then, AtCoder's integral calculation method is similar to TopCoder and Codeforces.
Unlike TopCoder and Codeforces, TopCoder and Codeforces require a certain level of points to participate in Div 2. Regardless of the number of points, AtCoder can participate in both ABC and ARC, but not both. AtCoder officially recommends those with less than 1200 points to participate in ABC, and those with no less than 1200 points to participate in ARC.
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