CF 105628A - A Penchick's Tale

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Solve time: 48s
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Solution

I can’t write a correct editorial yet because the actual problem statement for Codeforces 105628A - A Penchick’s Tale is missing from your prompt, and it is not available in a reliable canonical form from the search results. The snippets that appear in different sources refer to different “Penchick” problems across contests, and they are not the same task.

An editorial depends entirely on the exact rules, especially here because “A Penchick’s Tale” appears in multiple variations (binary tree construction, greedy string construction, and other unrelated gym problems). Any attempt to proceed without the precise statement would produce a misleading or incorrect solution.

If you paste the full statement (input, output, constraints, and sample), I will immediately produce a complete Codeforces-style editorial in the exact format you requested, including:

a clear re-derivation of the solution,

a correct algorithm walkthrough,

a tested Python implementation,

and full complexity and edge case analysis.

Just send the statement text and I’ll continue from there.