As a competitive programmer for about 3 years, I’m confused about the divisions on different online judge platforms. I have participated a number of contests with my account on CodeForces, AtCoder, and Luogu.
In fact, I’m now still an expert in Codeforces and blue in AtCoder, but I just accidentally jumped into Div.1 in 3 contests, and now I’m nearly a 6-star.
I’m confused how CodeChef defines their Div.1’s difficulties.