[dewy]

I would second the Coursera course(s), which is one of the best MOOCs I've ever taken (Algorithms 1 & 2 from Princeton).

Watch the videos, then read the relevant section of the text book, and don't miss the assignments which were fantastic ways to learn about the nuances of writing efficient algorithms and data structures.

If only every programming MOOC put that much effort into their autograders...