Google contacted me through my school's recruiting program. I had two back-to-back, 45-minute in-person interviews. Both interviewers were very nice and professional.

One interviewer's style was a little annoying. Every time he asked a technical question, I would answer, and he would just smile at me, not indicating whether or not I was correct or on the right track.

The first interview mainly focused on one question: writing a copy-on-write string.

The second interview included a couple of smaller questions, followed by asking me to combine two sorted iterators while keeping them sorted.

The whole interview process wasn't bad at all. I made a very silly mistake on the iterator question, eventually getting it, but they probably expect a perfect response for such an easy question.

Implement copy-on-write strings, combine two iterators.