Amazon Software Development Engineer interview questions

I got a call from Amazon on a friday. I was offered to appear for an online test. Because of personal commitments I was not able to take the test. I took the test on the next weekend. I got a call from the HR on the next Tuesday where she scheduled a telephonic interview for me with the Hiring Manager. This telephonic interview, as a company policy, might be with anyone. There were 2 technical questions posed to me for which I had to verbally speak the code. Q1: Implement a stack with the getMinimum() function apart from the other basic functions. A: using another array as a minStack. if(e < minStack.peek()) minStack.push(). if(poppedElement == minStack.peek()) minStack.pop(); Q2: There is an array of numbers where the number are continuously increasing until any position. After which they are continuously decreasing. Find the element where this has changed. A: binary search. After the telephonic Interviews, I was called for onsite interviews where there were 5 rounds. Each of them had 2 questions. All technical and problem solving. I dont remember all the questions now.