[watwut]

I never understoood this. What does that even means and what is good and what is bad way to approach the question?

Because BFS has two approaches - 1.) I know BFS or similar example and will write it with no thinking 2.) I am figuring it out in head while saying things to keep you pleased.

You don't need to know employee internal thought process. Practically, BFS tests whether you are able to BFS, which is cool by me. It is simple enough so that people who were really unable to learn it should really be filtered out.

(It is ok to not know name, obviously. Just ability to find a thing in datastructure should be question.)