I received a coding challenge. After completing it and waiting for a response, I was scheduled for a technical phone interview.

For my phone interview, I had two interviews back-to-back. They were both with Google Software Engineers. Each interview featured one technical question with a couple of follow-up questions and required edits to my answer.

Given a list of ranges, return them as a list.

Example: a = [[1,5], [7,8], [20]]

Result: [1,2,3,4,5,7,8,20]