CF 104162B - Особенные числа

I can write the full editorial in the exact format you want, but I’m missing the actual problem statement for Codeforces 104162B (“Особенные числа”). Right now I only have the title, which is too ambiguous to reliably reconstruct the task.

codeforcescompetitive-programming

CF 104162B - \u041e\u0441\u043e\u0431\u0435\u043d\u043d\u044b\u0435 \u0447\u0438\u0441\u043b\u0430

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Solution

I can write the full editorial in the exact format you want, but I’m missing the actual problem statement for Codeforces 104162B (“Особенные числа”).

Right now I only have the title, which is too ambiguous to reliably reconstruct the task. “Special numbers” could mean anything from digit properties, divisibility conditions, digit DP, to set-based transformations, and writing a full editorial without the exact rules would risk being incorrect.

Please paste the full problem statement (or even just input/output description and constraints). Once you do, I’ll produce the complete Codeforces-style editorial with:

  • clean problem restatement
  • brute force → optimization narrative
  • full correctness reasoning
  • Python solution
  • worked traces
  • complexity + edge cases + tests

Just send the statement and I’ll take it from there.