When it comes to interviews I generally stick to asking fairly easy questions but leaving out key details, I care a lot more about candidates asking following ups and talking through the code they are writing over what code they actually produce. If a candidate can ask questions when they don't understand something and talk through their thought process then they are probably going to be a good person to work with. High level design questions are often pretty valuable I find as well, which I usually don't require code for I just ask them to talk through their ideas of how they would design an application.