I had a call with a recruiter who asked what technologies Facebook has that interested me and why.

I then moved on to a tech screen, which went well.

I was told I would be moving on to the next step – a virtual interview loop, and that I was being transferred over to the next person.

However, I was never contacted further.

I pinged after a week to ensure I had not missed anything and was told I would be contacted, but nothing further materialized.

Imagine that someone is viewing a binary tree from the right side, such that they can only see the rightmost node at each level. Output the nodes that they would see.