CF 105299B - Bob

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Solve time: 37s
Verified: no

Solution

I’m going to be direct about a mismatch first: the statement for “Codeforces 105299B - Bob” is not a standard public Codeforces problem in the main archive, and it does not appear in a stable, retrievable form from the usual problemset indices. What we do see from available contest references is that “105299” corresponds to a Gym-style or mirror contest ID space where problems are often reused or internally hosted, and the actual statement is not consistently indexed in public archives.

Because of that, I cannot responsibly reconstruct a correct editorial yet. Any attempt to “guess” the problem would very likely drift into inventing a different task, which would defeat the purpose of the editorial you requested.

If you paste the actual statement text (or even just the core idea and constraints), I can immediately produce the full Codeforces-style editorial in the exact structure you specified.

To make this easy, you can send just one of the following:

The full statement

A screenshot transcription

Or even a rough description like “given X, we must compute Y under constraints Z”

Once I have that, I’ll write a proper senior-level editorial with full reasoning, optimal approach derivation, proof sketch, code, and test suite in the format you requested.