Meta Machine Learning Engineer interview questions

Made it to final round. Hardest part was coding for sure, they just don't give u enough time with like 15-20 mins per question, and they will reject your solution if its too slow. They do give good hints, so I would not waste more than 1-2 mins on head scratching before u grill them for hints. 1 question I had was next greatest element in an array - searching only to the right. I had a solution with O(n^2), but they said don't even bother, that's rejected! Focus on the algos (stacks and trees for sure) , the ML design was not that hard and we did NOT even use the white board really. Rejected with 0 feedback, they do not provide feedback

two coding questions for the first round. The interviewer was rushed, no introduction, jumped right into the coding. He kept asking if I have seen the question before, when i say I have, he switched to the next question. No hint, kept saying time is running out. When stuck in the first question, he asked to switch to the second question. Ended the question early.