Python program to check whether a given binary tree is perfect or not.














































Python program to check whether a given binary tree is perfect or not.



Description:
A Binary tree is perfect when its all nodes have two children and all leaves are at  same level.
Example:

This is perfect Binary Tree                                              This is  not a perfect Binary Tree 


Program :
class Node: def __init__(self, v): self.value = v self.right = self.left = None # Returns depth of leftmost leaf. def findADepth(node): d = 0 while (node != None): d += 1 node = node.left return d #check nodes have two children or not and leaves are at the same level def isPerfectRec(root, d, level = 0): if (root == None): return True if (root.left == None and root.right == None): return (d == level + 1) if (root.left == None or root.right == None): return False return (isPerfectRec(root.left, d, level + 1) and isPerfectRec(root.right, d, level + 1)) def isPerfect(root): d = findADepth(root) return isPerfectRec(root, d) # Driver Code if __name__ == '__main__': root = None root = Node("A") root.left = Node("B") root.right = Node("C") root.left.left = Node("D") root.left.right = Node("E") root.right.left = Node("F") root.right.right = Node("G") if (isPerfect(root)): print("Yes") else: print("No")


Output:

Yes
>>>


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