great

so true

Great solution but this is giving valid output for wrong roman numbers likc CDC => 500

Thanks! That's why we're here right? Learning something new.

Well I just learned a new method. Very clean solution!

the code and explanation is amazing

The road will be mastered by the walking one, so don't worry much.

Aaaaaaaaaah, it's a progression. Aaaaaaaaaah… indeed, this is better than (1..num).sum, cuz if num == 1e36, then we're in trouble. Good stuff! Thanks!

I dig this

This solution seems to assume you can't refactor the Node class.

Beautiful

Excelent!

Would fail if event contains stuff like %d.