Google Software Engineer Internship interview questions

Took a "foo-bar" test, which coding test through the chrome browser and got an email from a recruiter to arrange the schedule of a phone interview. I could pick several available time and date then they finalize the schedule. I had phone interviews, which a two-hour coding interview by two different interviewers. Each interviewer gave me different problem and they have different style. For example, one interviewer allowed me to any of materials to solve the problem but the other didn't.

the recruiter was very nice, there were two phone interviews both consisting of minimizing space and maximizing efficiency, know your data structures and how to implement library functions, very technical and not really much behavioral questions