I was contacted repeatedly by the same recruiter on LinkedIn. I ignored it at first because I didn't have time for interviews. I already have a job with a reputable company.

When I finally responded, they started the whole interview process. I completed a phone interview and two onsite interviews (coding and design). It took two trips to the Facebook campus and, overall, several hours of my time. I had to take time off work because those interviews are conducted during regular office hours.

Couples of weeks have passed, and there has been no follow-up, despite my contacting the recruiter asking for feedback. I haven't even received a "thank you for taking your time to interview with us" message.

I find this outrageous. Facebook, this is not how you treat people and their valuable time.

Create a class implementing the iterator interface to go through an AVL tree.