Are these challenges supposed to be solvable within a reasonable amount of time in an interview (15-30 minutes)? Looking through the problems they are all things I could do, but I don't think I would be able to solve any of the harder ones in under an hour - and that would be on my own, not in a high-stress interview.
Is solving a problem like this in 15-30 minutes under a good deal of stress and likely without reference likely on a whiteboard something someone in the position you're hiring for would ever need to do?
