Codeforces Problems

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Games & Sports
Codeforces Problems results
public source

A problem is identified by contest and index

problemset.problems returns problems and problemStatistics. A problem can contain contestId, index, name, type, points, rating, and tags. The contestId + index pair is the practical reference for opening the correct statement; a name can repeat or change context. Use the identifier when saving a list, sharing a selection, or matching the response to a contest page.

Keep contestId and index together, not only the title.
Check type before assuming an item is an ordinary programming problem.
Read the current statement and rules on Codeforces before attempting a solution.

Tags and rating organise discovery, not the answer

tags describe topics assigned to a question, while rating and points are platform metadata. They help filter practice by subject or build a personal sequence, but do not guarantee that two problems demand the same technique, time, or difficulty for every person. problemStatistics is a separate collection and should be related by the same identifier.

Use a tag to find themes; combine it with reading the statement.
Do not treat rating as a skill diagnosis or universal path.
Show collection date when displaying rankings, points, or statistics in an interface.