I wonder if you are allowed to use your own code editor? I can imagine them tracking your typing/editing, and if you are just copy-pasting a solution into the editor at the end, then they might get suspicious that you have not actually programmed it yourself.
For the one I did, at least, they warned you that they would be recording your screen. So they could see everything I was doing, including googling and going to StackOverflow!
note to self: close pornhub tabs before starting interview. :-)
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