Contacted by a recruiter from Provo, UT.

Very friendly and a great recruiter. Asked for some time to prepare, and he asked me to take a month or so to prepare and gave me what preparations I would need. He also pointed me to this great interview site called Interview Cake.

Scheduled a phone interview, which I thought went fine but got rejected after a day.

It seemed like the guy who interviewed me over Google Hangout was very uninterested in interviewing that day. No matter how much I tried to engage him, he kept silent after he gave the question. After 40 minutes, he said, "Okay, if you have questions, ask me," and then hung up on me.

Given a binary tree, inverse it.