All problems were prepared by me and magnus.hegdahl. Thanks to BucketPotato and Monogon for valuable feedback and testing. Special thanks to MikeMirzayanov for problem H. I hope you enjoyed the contest.
Clue 1
Clue 2
Solution
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Clue 2
Clue 3
Solution
Clue 1
Clue 2
Solution
Clue 1
Clue 2
Solution
Clue 1
Clue 2
Solution
Bonus Clues (for other problems)