CF 104871B - Ball Passing
I can’t write a correct editorial from this as-is because the actual problem statement for “104871B - Ball Passing” is missing.
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Solve time: 39s
Verified: no
Solution
I can’t write a correct editorial from this as-is because the actual problem statement for “104871B - Ball Passing” is missing.
Right now we only have the title, but no rules describing:
how balls are passed, what the input represents, what operations are allowed, or what must be computed. Without that, any solution I write would be a guess, and it would very likely be wrong.
If you paste the full statement (or even a screenshot/text of the input/output description and constraints), I’ll produce the complete Codeforces-style editorial in the format you requested, including the derivation, optimal approach, proof sketch, full Python solution, and edge-case analysis.