Maybe I'm weird for this and just thinking about it because of the hello world thread, but one of the things I've honestly found is that in most cases, fizz buzz really is kinda the best tech screen problem out there. Vary it up a little if you want, but if you're looking for the bare minimum "has this person heard of control flow" and "does this person think to ask clarifying questions about requirements" it is the tiniest shell of a problem that doesn't require someone to actually be able to remember algorithms under fire in an interview