Programming

essentially, it's qsort, just slightly modified (if I'm not mistaken). Congratulations, it's a very interesting and unusual solution!)))

Excellent, 3 out of 5 tasks are ready, and a tournament will be held soon!!!
These 3 tasks are standard and extremely simple. If you received a 5 or 4 in school on the topic of programming, you will easily complete them!
Tasks 4 and 5 are designed for a more thoughtful solution. We haven't decided yet, but most likely task 4 will be related to sorting,
nik312 ;) and task 5 will be an Olympiad-level problem.