Amazon AS Intern interview questions

I submitted my resume through the website and get back from the recruiter after one month. There are two back to back phone interviews, each last 45 minutes. The questions are generally data structures such as Hashtble and how to handle collison and some OOP concept like what is polymorphism, encapsulation and inheritance.

2 sets of 45minutes phone interview with 15 minutes break in the middle. The first round is a general data structure question. It is not that hard but you need to be familiar with frequently used data structure like arraylist, linkedlist, stack, queue, hashtable and so on to solve the problem. the second round is a harder algorithm problem.