COURSERA

Algorithms: Design and Analysis, Part 1

https://www.coursera.org/course/algo

http://www.geeksforgeeks.org/counting-inversions/
http://stackoverflow.com/questions/337664/counting-inversions-in-an-array

https://class.coursera.org/algo-006/wiki/Syllabus

Algorithms: Design and Analysis, Part 2

https://www.coursera.org/course/algo2

Algorithms, Part I

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

Algorithms, Part II

https://www.coursera.org/course/algs4partII

Analysis of Algorithms

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