I was referred to a recruiter by a friend who had interned there the previous summer. She contacted me, and we set up an in-person interview on my university's campus.

The recruiter was great. The interviewer, however, was not so much.

He barely introduced himself and gave no explanation about what he did. We jumped right into a technical question. When I was explaining my answer (and not struggling, mind you), his phone went off, and he pulled it out. He then proceeded to respond to an email while I was talking.

This was incredibly irritating and rude, but I assumed he was still listening to what I was saying. Nope, when he was finished, he looked up and asked me to repeat what I had just said. Incredibly unprofessional and terrible interview etiquette.

Given two LinkedList ListNode pointers, determine if the two lists ever intersect.

Building upon that, if they do intersect, at what node?

Building on that, what do you do if there is a circle in the list, and can you detect one?