Having "solved" a bunch of these divide & conquer problems, I'm the first to admit to having being lulled into a false sense of security. At first glance, the problem of this post seemed deceptively simple and consequently I struggled with it, sort of "hand-waving", not really engaging my brain and getting more and more frustrated how the dang thing wouldn't yield to my experience! I think the moral of the story is math doesn't care about your previous successes and so don't let your past pr...
