# Leetcode: Maximum Depth of Binary Tree

Given a binary tree, find its maximum depth.

Given a binary tree, find its maximum depth.

The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.

Github: code.dennyzhang.com

Credits To: leetcode.com

Leave me comments, if you have better ways to solve.

```## Blog link: https://code.dennyzhang.com/maximum-depth-of-binary-tree
# Definition for a binary tree node.
# class TreeNode(object):
#     def __init__(self, x):
#         self.val = x
#         self.left = None
#         self.right = None

class Solution(object):
def maxDepth(self, root):
"""
:type root: TreeNode
:rtype: int
"""
## Idea: DFS
## Complexity:
depth = None
if root is None:
return 0
if (root.left is None) and (root.right is None):
return 1
elif (root.left is None):
return self.maxDepth(root.right)+1
elif (root.right is None):
return self.maxDepth(root.left)+1
else:
return max(self.maxDepth(root.left)+1, self.maxDepth(root.right)+1)
```

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