Design the most efficient (you believe) algorithm to serialize and deserialize a red- black tree. Briefly explain why you think this is the most efficient solution. Note, your deserialization function...

Extracted text: Design the most efficient (you believe) algorithm to serialize and deserialize a red- black tree. Briefly explain why you think this is the most efficient solution. Note, your deserialization function should return "invalid" if the given sequence can not form a valid red-black tree.