Others may disagree, but I think if you haven't seen the problem before (or a close variant), chances are that you won't be able to finish it during the intervi

Others may disagree, but I think if you haven't seen the problem before (or a close variant), chances are that you won't be able to finish it during the interview (unless it's an easy problem). FAANG interview a lot of people and the bar is high. You're competing with people who completed tons of leetcode problems. When I started practicing leetcode, I underestimate the amount of work to be ready (they say that you should solve 100 problems, I think it's much higher, but obviously some guys are smarter than others...). That being said, I'm 50-75% of myself during an interview. I managed to fail at questions that I did several times before. The experience is also different from one interviewer to the next. You can have a guy who asks an easy question, provides help, and still give very positive feedback because he was happy with the way you communicate and explain your algorithm. Then you can have an interviewer (usually more junior ones) who asks a "trick" question that there's no way of solving if you havent' seen it before.