What it does
Kattis provides programming problems with suggested difficulty levels and participant rankings.
Start with one of the easier suggested problems to learn how the archive presents tasks. Difficulty labels help you choose a next problem without treating the ranking table as a study plan. Use a harder task when you want to stretch a specific technique, then return to the statement to check your assumptions. The archive tells new users to register before starting to solve problems.
Sources
- Kattis, Kattis (Oct 26, 2026)