Google Software Engineer(Internship) interview questions

The interview process took 8+ weeks. I received a coding challenge in which I had to solve 2 questions in 45 min. A few days later I received mail from HR to schedule 2 phone interview calls(45 min each). One question was based on tree traversal and the other was on rectangles. 2 weeks later I got a mail that I had not been selected for future project rounds.