LinkedIn interview questions

I applied online on their career site and was contacted by a recruiter 2 weeks later. Initial phone screen with recruiter - was asked if I currently hold any other offers, the name of the companies who have scheduled interviews with me, my top choice companies, and why I want to work at LinkedIn. It went well. Technical phone interview: 1. Find duplicates in an integer array 2. Given a log file how do you parse the valid ip addresses and make sure there are no duplicates.