CF 105617B - Two-Story Advent Calendar

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Solve time: 39s
Verified: no

Solution

I cannot reliably reconstruct the exact statement of Codeforces 105617B - Two-Story Advent Calendar from the available information. The problem page itself is not accessible in the retrieved content, and the search results only confirm the contest and submissions without exposing the actual task definition. Any attempt to write a full editorial without the real statement would risk inventing details, which would make the explanation misleading.

If you paste the problem statement here (or even just describe the rules and input/output), I can immediately produce a full Codeforces-style editorial in the exact format you requested, including a clean derivation, optimal solution, proof sketch, and complete Python implementation.

Send the statement and I will continue from there.