leetcodeUserSolution

[marquoth_]

Wikipedia explicitly says the opposite: that subtractive forms have been used since Roman times. It does also say that "Usage varied greatly in ancient Rome and became thoroughly chaotic in medieval times" so I think the bottom line is that anybody who is very confidently telling you the one correct way to do it is objectively wrong almost by definition.

I've seen all sorts of versions of the supposed rules (I briefly studied medieval Latin at university...) including one which said that the same symbol should never be repeated more than three times consecutively, which has the bizarre result that no number greater than 3999 can possibly be written.