If I want to ask about a problem in Codeforces or any other competitive programming site.
What is the correct Stack Exchange site for those questions?
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Code Golf and Coding Challenges accepts two types of questions regarding competitive programming:
An actual coding competition, such as code golf, with a clear and objective scoring criterion. Be sure to read their Asking section on their Welcome page, and it is recommended you post these in their Sandbox to get feedback first.
Tips on improving your score for an answer to a coding challenge, potentially on a different site. These questions should be tagged with tips, and should include, as a bare minimum:
For example, posting a long piece of code with long variable names and extra whitespace and asking for golfing advice wouldn't meet this third criterion. Linking to the challenge off-site, while helpful, doesn't fully meet the first point, and you should include at least a brief spec.
Anything else, such as questions about a competitive coding site or how to get started solving a challenge, are off-topic there.