### 104. Maximum Depth of Binary Tree

题目:
<https://leetcode.com/problems/maximum-depth-of-binary-tree/>


难度:

Easy


简单题,但是这道题跟[leetcode111](https://github.com/Lisanaaa/thinking_in_lc/blob/master/111._minimum_depth_of_binary_tree.md)不一样，这道题没有特殊情况，所以一行就够了


```python
class Solution(object):
    def maxDepth(self, root):
        """
        :type root: TreeNode
        :rtype: int
        """
        return 1 + max(map(self.maxDepth, (root.left, root.right))) if root else 0
```
