Couldn't recommend Jeff Erickson's lecture notes more for algorithms, DP, and the like. I too did rather poorly in the class so you're not alone! In a similar vein, Lawrence Angrave, a systems programming lecturer, has a wonderful crowd-sourced "book" [1] on all things systems programming. It is my go to resource for brushing up on these topics. Lastly, David Forsyth, a statistics/applied ML lecturer has a gold mine of a book for diving into ML and difficult concepts that come with it [2]. [1] https://github.com/angrave/SystemProgramming/wiki [2] http://luthuli.cs.uiuc.edu/~daf/courses/AML-18/learning-book...