CFLevels

Filter problems on Codeforces by contest division and problem index directly in the problemset sidebar.

CFLevels adds contest division and problem index filters to the Codeforces problemset page. Features: - Filter by contest divisions to practice target rounds. - Filter by problem letters to focus on specific problem positions. - Supports multi-select across both contest divisions and problem letters. - Combines directly with native Codeforces tags and difficulty rating filters. - Automatically updates available levels based on your active filters. - Runs entirely in your browser with zero tracking and no login required.