I have been trying to solve atcoder problems recently using this problem filter website.
website
However, I am generally finding blue tagged problems more challenging than 1900-2000 rated codeforces problems. I am even finding some cyan coloured problems challenging enough, more challenging than 1700-1800 rated CF problems. Is this only me or others also facing this?
What are the rating of problems based on colours(unfilled, half-filled, filled)?