Amazon Software Engineer (internship) interview questions

I applied at the beginning of September. I was sent an email in the middle of October and was told that I was going to move to the next step. The first step was an online test consisting to two parts. The first part was simple logic debugging small programs that consisted on changing one line of code to solve the problem. The second part was a simple IQ test. After passing that test, I was given another test. This test was solving simple programming challenges. It was relatively easy. The programming challenges incorporated linked lists and simple arrays. After passing this test, I reached the final step and was scheduled an interview. The interview question was super simple. I do not know how I was not able to solve it. I think it is because I did not sleep the two previous nights because I spent them doing a lot of homework for my classes and my head was shot. After the programming question, I was given time to talk about my resume, but I knew that I was out when I did not solve the question. I don't think I am that smart, but I think that the amazon process was to easy for its name.