Meta Software Engineer interview questions

Contacted by recruiter on LI for a contract position (remote). First round: self serve coding similar to leetcode (dynamic programming question). Second round: in-person coding using my language of choice (C++) on topics of sparse linear algebra and image processing. Perhaps, I am not used to this type of interviews, but I found it a bit hard to communicate and understand how my solution needs to be delivered and what are the given requirements; the interviewee seemed to be distracted throughout the whole time, obviously switching between the windows; that made it a bit difficult to fully focus. At the end I could not answer on how to further optimize my final solution; it was only 2 minutes left. Was ghosted by the recruited afterwards. Even an automated reply would be nicer.

phone screening and a assesement test they will send it via email, they usually take 1-2 week to reply and the recruiter usually will do a prep with you and share releated informaiton