I'm trying to introduce a friend to competitive programming. He is an engineering student who enjoys the sort of problems we have here on Codeforces, but he did not study CS and is lacking a lot of the basics most of us take for granted. He knows how to program (in Python) but doesn't know a lot of the algorithms 101 topics, such as a strong grasp of computational complexity, sorting algorithms, or even some basic data structures like hashtables and binary trees.

I know some good texts that can help those who have this fundamental knowledge (primarily Laaksonen's book), but what's the best way to introduce someone who lacks any formal CS education?

I'm especially looking for books or websites that he can use by himself.