My son was only a few months old. I had made it to the final rounds the interview process at a FAANG. He hd kept me up the night before as he had a cold I tende

My son was only a few months old. I had made it to the final rounds the interview process at a FAANG. He hd kept me up the night before as he had a cold I tended to take care of him in the night so my partner could sleep. Next day I was asked all kinds of fun, esoteric questions about the C specification. That’s was hard. I was frazzled. The final question I was asked to implement knn. Which I did brute force. And then I was asked to optimize it. And I was basically falling apart at that point and couldn’t recall a k-d tree. I blundered my way through some dead end. This was for an engineering position embedded in an ops team. Sensing my interviewer’s frustration I asked if they’d ever have to implement knn on a page in a limited amount of time in order to bring the system back online. They said no. I never got an offer for that one.