Pocket Gems Software Developer interview questions

HR contacted me for a phone interview. This phone interview consisted of 3 questions and lasted approximately an hour: a string question, a brain teaser, and a graph question. I received an e-mail shortly after my phone interview to setup a 2nd. This one consisted of another 3 questions and also lasted around an hour: a string question, a graph question, and questions about how a hash table works. I didn't receive a 3rd phone interview or on-site interview request. Note: The phone interviews take as long as it takes you to solve the problems. Try to solve the problems as accurately and quickly as you can.

I was introduced to Pocket Gems by a recruiter who found me through Linked In. The Pocket Gems recruiter interviewed me, then set me up for a technical interview. He referred me to Glassdoor.com to prepare. When the interviewer called, he sent a link to a document that he could see on his computer, as I typed. He asked 3 questions, including one brain teaser.