Amazon Quality Assurance Engineer interview questions

Very heavy on coding questions, even for a position as a manual test engineer. I guess this is a common thing at Amazon, they expect a certain level of development experience for everyone. My interview was with three people, and only took 90 minutes.

First round was aptitude in which two questions were given for coding. Second Round was again a coding round where two problems were given which needs to be solved within an hour. Third Round was Technical round where questions on all cse core topics were covered like data structures,algorithms,etc Final Round was a Technical round again where a problem was given and was asked to come up with optimal solution.