Those are too abstract as described. Could you copyright an implementation of those? Yes. And if someone did you shouldn't infringe on theirs you should write your own. But that's not new, you can find tons of different basic data structure implementations out there, with a variety of licenses.
Yes and no, I guess if that's what they meant then yes I was nitpicking but I took it literally (lots of folks confuse concepts between patents, copyrights and trademarks. Less common on HN but still happens. )
