Amazon Software Engineer interview questions

I actually had two phone interviews. The interviewers weren't rude, just completely impersonal. I began to question what they actually knew themselves. Questions such as writing a method to print out a number of indeterminate size by printing each digit from left to right, how to traverse a balanced tree. I thought my first interview was horrible, but got a second call. Thought my second interview was good, never heard back. Just as well, as I haven't read any positives about working there.