Meta Software Engineer Internship interview questions

An hour of background questions. An hour of technical questions. I talked to a different person for each stage, and both people were very friendly and guided the interview well.

Basically I reached out to a university recruiter who had visited our campus a couple of times. Very nice and gave me a full critique of my resume. Still liked my experience enough to refer me to technical recruiter. Technical recruiter called about a week later and we performed the white-boarding test. Questions were asked over the phone and I was expected to put my answers into an online IDE that he could see. First two questions were relatively easy but last one was very difficult and I didn't finish it well (time complexity was too high). I did not receive an offer.