LinkedIn Software Engineer interview questions

I was contacted by a LinkedIn recruiter a few months ago (by November, 2014 I think) about a position in Software Engineering area. After the first phone screen (non technical) I was scheduled my first technical phone interview, I decided to take 2 months to get ready and warming up in Algorithms and Data Structures. Finally I finish my first interview very disappointed (with my self) because the interview question was so easy that I could have wrote the solution in less than 15 minutes and I spent almost 45, thanks to my nerves. The interviewer was polite, well explained and called on time, I have no complains about that.

Initially talked to HR. She asked which all companies I was interviewing with and few other common questions. Then got one technical phone interview through collabedit. Asked about Least common ancestor using parent pointer. They don't even care to reply if you are not selected. Even if you follow up they won't respond.