1. Implement a function which the input is the definition of a circle on a 2-D plane and return a random point on the circumference. How to test it to make sure it is correct? 2. Questions about Linux. 3. Data structure to implement database index. 4. Questions about concurrency and critical section. 5. OSI model. How does Google handle user's query to return the most relevant websites or answers. 6. Design a library to read configuration and set up other applications. 7. Algorithm question about tree structure and sorting.
