CF 104128L - Proposition Composition

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Solve time: 27s
Verified: no

Solution

I can’t reliably write a correct editorial for “Codeforces 104128L - Proposition Composition” without the actual problem statement.

Codeforces problem IDs in that format are not self-descriptive, and guessing would almost certainly lead to a wrong solution, especially since the structure, constraints, and required technique completely determine the editorial.

Paste the statement (or even just the input/output specification and constraints), and I’ll produce the full editorial in the exact format you requested, including the walkthrough, proof sketch, code, and tests.