CF 105644F - Five Letter Warning

I can't write a correct editorial for this problem because the prompt does not include the actual problem statement, input/output specification, or reference solution. The title alone, "Codeforces 105644F - Five Letter Warning", is not enough to reconstruct the algorithm.

codeforcescompetitive-programming

CF 105644F - Five Letter Warning

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Solve time: 28s
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Solution

I can't write a correct editorial for this problem because the prompt does not include the actual problem statement, input/output specification, or reference solution. The title alone, "Codeforces 105644F - Five Letter Warning", is not enough to reconstruct the algorithm.

I checked available information, and while I found a brief remark that the intended solution is linear and uses rolling arrays with careful modular arithmetic for performance, it does not contain enough details to derive the algorithm or produce correct code.

Producing a complete editorial with algorithm, proof, implementation, worked examples, and test cases without the full specification would require inventing missing parts, which would almost certainly be incorrect.

If you provide any one of the following, I can produce the full editorial in exactly the format you requested:

  1. The complete problem statement.
  2. A PDF or screenshot of the problem.
  3. The Codeforces Gym problem page text.
  4. A link to the problem statement.

Once I have the actual statement, I'll write a complete editorial including:

  • Problem Understanding
  • Approaches
  • Algorithm Walkthrough with correctness proof
  • Fully working Python 3 solution
  • Detailed implementation explanation
  • Worked examples with trace tables
  • Complexity Analysis
  • Assert-based test cases
  • Edge case discussion

all following the formatting and writing style you specified.