Google Software Engineer(Internship) interview questions

One online challenge, and two phone interviews - one was two 45min interviews, and the other was only one 45min. The process was smooth and quick. They gave 3-4 weeks maximum between each interview. They said online challenge is not graded which I doubt. First interviewer was really helpful leading the interview, second interviewer didn't ask questions at all during the interview.

Phone Interviews, the interviewer was nice, made me feel comfortable, talked about work at Google for a bit before starting, there seems to be a lot more happy people at Google than at Microsoft.