These are primarily the solutions of the questions on www.interviewbit.com. (Except for some other origin questions)
I have used python 2.7.10 to solve them.
You can check the question by stripping the name off from the script name and forming the URL for the question
i.e. The script ib-merge-overlapping-intervals.py is the solution for question at https://www.interviewbit.com/problems/merge-overlapping-intervals/