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I found his courses rigorous and approachable too. I think they were equivalent to the courses he taught while at Stanford.

https://timroughgarden.org/videos.html

Another vote for Tim Roughgarden’s work. As someone who recently became a software engineer without a cs degree, his Stanford Algorithms I & II lectures (similar content to his books) have been the best instruction I’ve had on DS&A. I’ve dabbled with Skiena’s book, Grokking Algorithms, CTCI, and I now also have a copy CLRS that I use for reference or to go deeper on certain things. But I revisit Tim’s work all the time. Can’t recommend him enough.

Is there a way to buy ebooks from the seller other than Amazon (for those of us who hate Jeff Bezos ;) ?

Unfortunately no. Possibly email the author?

http://www.algorithmsilluminated.org/