Very important callout about the time. Solving the problems alone in your personal environment is a completely different experience compared to being judged on

Very important callout about the time. Solving the problems alone in your personal environment is a completely different experience compared to being judged on the spot + knowing the person interviewing you is determining whether you get a 2x compensation boost + you need to solve the problem in 15 minutes and a single mistake in your reasoning steals precious time that you may not be able to recover. I was comfortable solving mediums in about 30 minutes before I committed to my Facebook interview. I was devastated to find that not only is 30 minutes more than the 20 minutes they give me before moving on to another question, I was so stressed that my thinking process was significantly slowed.