Meta Software Engineer interview questions

They contacted me by email and asked me to perform a test at interviewstreet.com website. The test has a timer and should be solved in at most 1 hour. You should write the code, and make sure that all test cases are passing. That means that you have to write the output in the exactly way they are expecting. I finished the test in 55 min. After that they contacted by email again to schedule a phone interview.

I was asked to implement a few algorithm based questions on an online whiteboard. They are looking for people who come up with the fastest algorithm with no backtracking at all. For one of their questions, initially I implemented an O(n log n) solution and then realized a linear solution was possible but it was too late. I was informed the interview was over.