I had just found a possibly neglected case in 13th problem:Roman to Integer
See as follows:
The test case takes no consideration of the case when the string is empty.
Because it's not a correct Roman number? You could as well say that it doesn't take into consideration cases when the string is something like "th1sc@ntp0ss1blybe@R0m@nnumber".
I see, thanks for your answer!
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