data-structures

http://www.geeksforgeeks.org/graph-data-structure-and-algorithms/#shortestPath

http://btholt.github.io/four-semesters-of-cs/

https://www.hackerearth.com/practice/notes/sorting-and-searching-algorithms-time-complexities-cheat-sheet/ https://stackoverflow.com/questions/2307283/what-does-olog-n-mean-exactly

Analysis of algo good

https://stackoverflow.com/questions/11032015/how-to-find-time-complexity-of-an-algorithm

DB Questions http://javadecodedquestions.blogspot.com/2013/01/database-interview-questions-for-java.html

Algorithms - abdul bari https://www.youtube.com/watch?v=FtN3BYH2Zes