python: In a binary search tree, write another way of function that takes in a root, p, and checks whether the tree rooted in p is a binary search tree or not. What is the time complexity of your function? def is_bst(self, p):     root=p     def helper(root, l, r):         if not root:             return True         if not (left

C++ Programming: From Problem Analysis to Program Design
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Author:D. S. Malik
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Chapter18: Stacks And Queues
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python: In a binary search tree, write another way of function that takes in a root, p, and checks whether the tree rooted in p is a binary search tree or not. What is the time complexity of your function?

def is_bst(self, p):

    root=p

    def helper(root, l, r):

        if not root:

            return True

        if not (left<root.val and root.val<right):

            return False

        return helper(root.l, l, root.val) and helper(root.r, root.val, r)

 

    return helper(root, float('-inf'), float('inf'))

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