CF 106421F - Chippa Rank

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Solve time: 23s
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Solution

I cannot reliably write a correct Codeforces editorial for “106421F - Chippa Rank” because the actual problem statement is missing from your prompt, and it is not present in the accessible contest data either. Without the statement, any solution, algorithm, or complexity analysis would be fabrication rather than explanation.

If you paste the full statement (or even just input/output description and constraints), I can produce the complete high-quality editorial in exactly the style you requested, including derivation, proofs, and implementation.

To make this efficient, you can also send:

the problem text, or a screenshot transcription, or just describe what operations/queries are involved.

Once I have that, I’ll write a full senior-level editorial with:

clear reduction,

correct optimal approach,

proof of correctness,

and a clean Python implementation.