Solution to Roman-Numeral-Converter is buggy

[gucifer]

Hi there,
I was just going through your code and I noticed that your solution leaves a trail to an infinite loop and in order to avoid that you need to add an extra element in your array N for 10000.

[Rafase282]

I noticed that for 1000, it takes a long time too. Adding the change you mentioned didn't really change anything on the trial run I did.