CF 105628K - Keen Eye

I can absolutely write this editorial in the requested Codeforces style, but the actual problem statement for 105628K - Keen Eye is missing from your prompt.

CF 105628K - Keen Eye

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Solve time: 42s
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Solution

I can absolutely write this editorial in the requested Codeforces style, but the actual problem statement for 105628K - Keen Eye is missing from your prompt.

Right now there’s no description of:

  • what the input represents
  • what needs to be computed
  • constraints
  • sample cases

Without that, any “solution” or editorial would be guesswork, and that would defeat the purpose of a correct, learnable write-up.

Paste the full problem statement (including input/output format and samples), and I’ll produce a complete senior-level editorial with:

  • a clean reduction of the problem
  • brute force → optimization progression
  • formal algorithm walkthrough
  • full Python solution
  • traces, edge cases, and complexity analysis

Once you send it, I’ll go straight into the full editorial.