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See the notes, the score being a single digit is guaranteed.
The only problem here is that when the score of one of the teams is a multi-digit number. Other than that - congrats for conciseness!
This kata made me learn something I never knew, and it's unlikely I'll ever use this formula
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Yes, you are right. The description and the solution covers only the years and centuries AD.
The century 1 contains the years 1, 2, ... 100 AD. The description does not specify the format of years BCE or centuries BCE. Some notations are "-1", "1 B.C.", "1 BC" or "1 BCE". A correct solution without a description of the year/century format is not possible.
That's all very neat, but doesn't work for ages BCE.
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Why, what's the problem? Care to elaborate?
Yeah, but you need a proof by induction to do that. Did you do one yourself or (like "plebs") take it from the internet?
Darn it, I feel so dumb now. Then again, I had hardly any sleep last night (: