MaximumDepthOfBinaryTree
Problem
Solution
If root
is None
, the height of a tree is 0. Otherwise, the height of a
tree is the 1 plus the maximum of the heights of the left and right subtrees.
Code
class TreeNode:
"""Node in a binary tree.
"""
def __init__(self, val, left=None, right=None):
self.val = val
self.left = left
self.right = right
def maxDepth(root: TreeNode | None) -> int:
"""Find the maximum depth or total height of a binary tree.
"""
if root is None:
return 0
return 1 + max(maxDepth(root.left), maxDepth(root.right))
Test
>>> from MaximumDepthOfBinaryTree import TreeNode, maxDepth
>>> root = TreeNode(3, TreeNode(9), TreeNode(20, TreeNode(15), TreeNode(7)))
>>> maxDepth(root)
3
>>> root = TreeNode(1, None, TreeNode(2))
>>> maxDepth(root)
2
- class MaximumDepthOfBinaryTree.TreeNode(val, left=None, right=None)
Bases:
object
Node in a binary tree.