Amazon Software Development Engineer interview questions

Summer SDE intern position. Totally three phone interviews. It seems that you get the third one if you can pass the first two. Questions are not difficult but you should be very careful when solving easy questions. Think about boundary conditions and error handling in your codes. I was a little bit surprised that I did not get an offer. I thought I performed OK at last interview but I received rejection mail two days later.

I had two phone screens. The first one was relatively easy and I was asked 1 programming question. One about reversing a string . The second interview consisted of two questions, the first question was to find whether any two numbers in an array sum up to give a third and the second question was to print a matrix in spiral order. After the two interviews I received an email from the recruiter to schedule a third. The third interview consisted of more theoretical questions such as define OOP and was also a little behavioral (interviewer asked me about my projects, about working in teams etc.) The coding question was to find a pythagoran triplet in an array which I solved in O(n^2) time using a hash table. I thought my last interview went pretty well but I did not receive an offer.