box 2021 and solutions

Revision en1, by box, 2022-01-04 10:09:49

Hello! This is the editorial (and discussion post i guess) for box 2021, a collection of problems that I set and received positive feedback on and generally just problems that I wanted to share with the broader CP community. The previous installment of this series is box 2020.

The contest is IOI-style with subtasks; the problems are roughly sorted by difficulty but there is no difficulty gradient.

103500A - Existence

Hint
Solution

103500B - Timelines

Hint
Solution

103500C - eerT tuC kniL

Hint
Solution

103500D - multiverse FINALE

i think this is the best problem out of these five — credit to radoslav11 for the solution idea :D

Hint
Solution

103500E - Factors

Partial solution

History

 
 
 
 
Revisions
 
 
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en1 English box 2022-01-04 10:09:49 7397 Initial revision (published)