Meta Software Developer Internship interview questions

two questions ,one is easy and familiar the other is more difficult you have 45 minutes to solve the two questions the difficult one a this graph question it sounded similar to the lowest comm0n ancestor in a tree problem but I wasn't familiar with this question during the interview, also the graph given in an array was confusing to me especially the direction of the edges for each tuple

A recruiter contacted me through Linkedin, then I sent my resume. I did 2 technical interviews (competitive programming problems). After waiting a bit I got an offer. That is all but i need to complete the 30 word mnimum lol