http://algs4.cs.princeton.edu/home/     Algorithms, 4th Edition by Robert Sedgewick and Kevin Wayne
Coursera MOOCs Algorithms, Part I
http://aofa.cs.princeton.edu/home/    An Introduction to the Analysis of Algorithms by Robert Sedgewick and Phillipe Flajolet
http://ac.cs.princeton.edu/home/    Analytic Combinatorics by Philippe Flajolet and Robert Sedgewick