From the guide: "we ask candidates not to compile or run their code during this exercise, and not to refer to online resources"

Seriously? You don't allow referring to online resources? Do you also unplug the internet connection for all of your existing programmers so they don't refer to online resources?

The whole point of the interview is to see how you would perform at your job at the first place, creating an artificial job for an interview where you swap words in the array or solving some other stupid quiz + disconnecting you from online resources is just plain stupid in my opinion.