They hire a third-party company called Karat to perform a 1-hour video coding interview.

The interviewer stressed that a complete solution was of utmost importance, not necessarily how it was implemented. I got mixed up on one part, but the interviewer didn't give me any pointers, despite me describing my thought process along the way. I've never had a technical phone screen where the engineer was that quiet during the coding portion (not even at Facebook, Airbnb, or Lyft). I got the solution in time, but I think they weren't happy with my confusion at one point and implementation.

One cool aspect is that you have the option to re-do your interview before they send a response. I would have done it, but I don't want to commit another whole hour to a third-party company interview. They didn't even do a behavioral phone screen.

Given parent-child relationships, determine the family members which have no parents or one parent.