Meta Software Engineering interview questions

It had two technical interviews, each asking two questions. I was expected to come up with an optimal solution and write working code in 45 mins for each interview.

Met recruiter at career fair, they directly setup an on-campus interview. We were taken into a room with an engineer who presented a question on the whiteboard and were given about 30-40 mins to solve it. There were supposedly gonna be only 2 interviews. I passed the first interview but could not solve the second one's question in time.