Amazon Engineering interview questions

I got a call from amazon and hr scheduled the interview. a technical person called me and without spending too much time directly asked me the question. he asked two question and asked me to review the code. they will expect good coding skills. after i read out the code he reviewed it and gave a test case. After giving the test case he asked me apply the test case on my code and asked whether it will pass or fail. the interviewer will not see for an exact answer but will see how you think if a problem is given to you and your approach to the problem.