Google Software Engineer, University Graduate interview questions

I applied online and 3 days later, I was asked to submit a coding sample. It consists of two tasks to complete in an hour. Again 3 days later, scheduled a phone call with recruiter. And then scheduled phone interview to after 2 weeks. I was asked a coding challenge and I have completed it partially. Though it is a bit easy but I just wasted some time on thinking. And then I didn't have chance to get scheduled for next round. PS: Just think out loud.

I am qualified for the first round of interview which consists of a short survey and coding sample. Where the Short Survey is about 15 minutes and coding sample is about 1 hour with 2 questions.