Amazon Software Developer interview questions

I applied for new grad position through their careers. After 20 days I got a mail from one of their recruiter and asked me to complete assessment test within 7 days. Test consisted of 3 coding questions and they should be coded within 90 minutes in your favorite language. Questions: 1. Test whether linked list is cyclist or not. 2. Print k closest points to origin out of n points in a XY coordinate system. 3. I don't exactly remember the third one, but it was related to arrays. After 2 weeks I got a mail from recruiter saying that they want to go with other candidates.