Ask HN: good, quick algorithms course to prepare for big tech interviews?

I'm going to be interviewing for a professional work experience year as a university student (engineering) at several big software tech companies. I studied mainly electrical engineering, and it's been a while since my computer science algorithms days. I've still coded pretty much every week, but I can't remember specific stuff like merge sort, binary heaps, etc (plus I don't know what I need to know).

I hear algorithms-type questions come up a lot, so I would like to prepare really well as quickly as I can. What good sources would HN recommend?

Thanks.