Domande di colloquio per Software Engineer, Mobile Applications (IOS/Android) presso Google

I have applied online and after a month i got a mail from hr manager that he wanted me to have time in exploring careers at google. He had a nice hangout call and was very positive and gave me much confidence in cracking the interview which was scheduled at month later (I was on vacation at initial process.). This was a technical round which went for 1hr. The interviewer directly jumped into the technical question after conforming my name without any other word.It was basic algorithm question with nice brain twisters. I felt he was not observing my code until i made some sort of sound. The way he interviewed was completely in contrast from the way I heard and read about the google interviewers.