I've really got to force myself to learn these data structures. The circular, doubly linked list is one of my favorite structures, I oddly find myself reaching for it all the time. Which is funny, because when I first had to implement it at school, I thought I would never ever have a use for such a thing. But now, years later, I don't know what I'd do without it!

I wonder what I missed out on by glossing over things like red-black trees.