Practice
Five cases from different families. No countdown, with an explanation for every constraint.
Automatic translation from Russian to English. It may contain inaccuracies.
Security engineering · hands-on
Build a working sequence of checks. Read the requirements: independent steps can swap places; required dependencies cannot.
Five cases from different families. No countdown, with an explanation for every constraint.
Three shared cases for today. A new set arrives at midnight in Moscow.
Cases combine learning families with different requirements. They model dependencies, rather than prescribe one pipeline for every organization. Every supplied step is required. The checker accepts any valid partial order, so there may be several correct solutions.
Earn 100 points on the first check, or 70 after an error. A hint caps the result at 50; revealing an answer gives 0. Only improvements to each variant add to overall progress. Replaying a daily challenge never changes its saved result or streak.
Progress is stored only in this browser.