• lugal@lemmy.dbzer0.com
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    7 hours ago

    The original doesn’t have an extra check for 9 and it works for Roman->Indioarabic because it’s:

    IX
    ->IVV
    ->IIIIV
    ->IIIIIIIII
    

    But the other way around, you need an extra step for 9. That’s where our misunderstanding comes from.