104. 二叉树的最大深度

原题

https://leetcode.cn/problems/maximum-depth-of-binary-tree/

思路

递归

复杂度

时间：O(n)
空间：O(n)

Python代码

# Definition for a binary tree node.
# class TreeNode:
#     def __init__(self, val=0, left=None, right=None):
#         self.val = val
#         self.left = left
#         self.right = right
class Solution:
    def maxDepth(self, root: Optional[TreeNode]) -> int:
        if not root:
            return 0 
        return 1 + max(self.maxDepth(root.left), self.maxDepth(root.right))
        

Go代码

/**
 * Definition for a binary tree node.
 * type TreeNode struct {
 *     Val int
 *     Left *TreeNode
 *     Right *TreeNode
 * }
 */
func maxDepth(root *TreeNode) int {
	if root == nil {
		return 0
	}
	return 1 + max(maxDepth(root.Left), maxDepth(root.Right))
}