Two coding rounds. Copy list with random poimters and simplyfy path. The other two questions are not on to leetcode but simmilar to their tagged questions. Gave optimal time complexity for 4 but still rejected. Only thing I can think of is copying random pointer with O(1) space is better. Communicate well with reasons and break down thought process. Give initial estimatin of complexity before even coding. Anwser C++ trivia along the way during coding. I have no difficulty in passing interview from 2nd tier company but when it comes to FAANG it seems I got bad luck. From Google to Amazon now to this, I guess I just need to try more until luck is in my favor