data structures - interview questions

I got few requests to post questions on linked lists,trees,graphs , sorting algorithms etc. i will be blogging when i have time for this.

first linked lists questions are here

http://techie-builder.blogspot.in/2012/06/linked-lists-questions.html

sortings:

http://techie-builder.blogspot.in/2012/07/merge-sort-iterative-way.html

Arrays:
https://techie-builder.blogspot.in/2016/06/generate-subsets-of-array-using-python.html