Amazon Software Engineer interview questions

Group interview (university graduates). The candidates were assigned to groups of 2-3 people. Every group is to complete a project which has 3 kind-of-independent subproblem. It's suggested that each candidate responsible for one subproblem. It's more like a individual project, since everybody's input/output file is independent from his teammates'. The problem is not hard if familiar with OOP and java, and time is sufficient. It's important to understand the requirement of all 3 parts of the problem to get better insight of your own part.