Are you imagining a scenario where the interviewer writes "invert a binary tree" on the whiteboard, refuses to elaborate and leaves the room for half an hour?
In real life they would either give you an example so you can better understand the requirements or expect you to come up with an example yourself and ask clarifying questions until you're on the same page as to what "invert" means.
In real life they would either give you an example so you can better understand the requirements or expect you to come up with an example yourself and ask clarifying questions until you're on the same page as to what "invert" means.