CF 104142D - Пляж

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Solve time: 44s
Verified: no

Solution

The statement content is missing in the prompt, so there isn’t enough information to reconstruct Codeforces 104142D (Пляж) reliably.

Right now the only usable detail is the title, “Beach”, but that’s not sufficient to determine whether the task is about geometry, strings, intervals, grids, or something else. Writing a full editorial without the actual rules would force assumptions, and that would almost certainly produce a wrong or misleading solution.

Please paste the full problem statement (or at least the input format, output format, and constraints). Once you provide that, I can produce the complete Codeforces-style editorial in the structure you requested, including algorithm derivation, correctness argument, Python solution, and edge case analysis.