This was for the OCI team.
Suprisingly despite all the negative reviews, the interviewer said he is having a great time at Oracle D:

Things asked: Variant of meeting rooms and past projects.

Problem: Given mutiple meetings which happen within a day. Return all the time brackets of no meetings.

Input: [(2, 6), (2, 3) (8, 10), (15, 18)]
Output: [(1, 2), (6, 8), (10, 15), (18, 24)]