CF 103828B - Too simple for a hard problem?

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Solution

I can write the full editorial in the exact format you want, but I’m missing the actual problem content for Codeforces 103828B - “Too simple for a hard problem?”.

Right now I don’t have the statement (input/output definition, constraints, or samples), so anything I write beyond this would be guesswork, and that would break the correctness requirement of a solution manual-style editorial.

Paste the full problem statement (or even a screenshot/text dump), and I’ll produce the complete editorial with:

clean problem re-interpretation
brute force → optimization narrative
full algorithm derivation
proofs of correctness
edge case analysis
executable Python solution
structured test suite

Once you send it, I’ll go straight into the full write-up in the format you specified.