Ask HN: Best resource to understand data structures and algorithms?

https://www.coursera.org/course/algs4partI https://www.coursera.org/course/aofa

The two books that helped me the most were:

Algorithms, 4th Edition by Robert Sedgewick. Material: http://algs4.cs.princeton.edu/home/

and Data Structures and Algorithms in Java, 2nd Edition by Robert Lafore

Both are in java.