While bad, it's still easier to comprehend than your deeply nested code (6 levels!).

Damn, this is elegant. It's not particularly efficient, worst case O(n^2) time and O(n) space, but the way you build the interval array is very pretty indeed.

I mean, can't you initialize the variables like a normal person? Each on a separate line?

Please, mark your post as having spoiler content next time.

I am getting the same error for no reason in my local machine it runs fine.