I think you're responding to someone other than OP? Certainly, demanding a CS degree is BS. Demanding you memorize the exact sequence of operations for rebalanc

I think you're responding to someone other than OP? Certainly, demanding a CS degree is BS. Demanding you memorize the exact sequence of operations for rebalancing a red-black tree is BS. But OP isn't talking about that, just about having the basic skill to write a simple program, which presumably you do have.