I couldn't disagree more. Where do you draw the line? What if you'd spent the previous two days reading about graph theory and in doing so had come across a ne

I couldn't disagree more. Where do you draw the line? What if you'd spent the previous two days reading about graph theory and in doing so had come across a neat network flow problem that co es up almost verbatim in the interview? What's the difference? Interviews are a filter and not necessarily always accurate or fair. This can go both ways. You can have bad days when your brain freezes. You can have good days when you're asked something you know in your sleep. It doesn't really matter how you know it. Besides just knowing the solution to something doesn't mean you can give the answer, discuss the solution and analyze other solutions, all of which may come up.