Google Software Engineer Intern interview questions

Submitted resume online and got connected by recruiter. Then scheduled two 45-mins technical phone interviews with Google engineers. It was not hard but I gave them wrong answer about time complexity. But the engineers are very nice and friendly. After that I got the email about making a third phone interview. I think that might because I did just on average in the first two rounds and they want to give me another chance. But later I got several other offer deadlines approaching and thus declined further interview process with Google. Google's host matching round takes quite a time. But great company though.