I'd just tell them. I wouldn't expect to get a different problem, but even if I did, so what. Those types of questions are all about the same, and coding ques

I'd just tell them. I wouldn't expect to get a different problem, but even if I did, so what. Those types of questions are all about the same, and coding questions are more about code than problem solving anyway. Even if you've already solved it, you can make mistakes when you do it again.