Write a C++ function bool isBalancedBST(Node * r) that returns true if the the binary tree with root r is both a balanced binary tree and meats the criteria of being a BST. You many include helper functions it your want. Node is a struct type with fields int value, Node * left and Node * right. BTW if r is null that counts as a balanced BST. Upload a complete program with a main that tests your function on at least four test cases that will return true and four cases that return false. All the test cases should be trees with at least five nodes.

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