[Leetcode] 0104. Maximum Depth of Binary Tree

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內容目錄

Easy

Given the root of a binary tree, return its maximum depth.

A binary tree’s maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node.

Example 1:

Input: root = [3,9,20,null,null,15,7]
Output: 3

Example 2:

Input: root = [1,null,2]
Output: 2

Constraints:

The number of nodes in the tree is in the range [0, 10⁴].
-100 <= Node.val <= 100

Python

				
					# 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:

        def longestPath(node: Optional[TreeNode]):
            if not node:
                return 0
            leftPath = longestPath(node.left)
            rightPath = longestPath(node.right)
            return max(leftPath, rightPath)+1

        return longestPath(root)

Easy

Python

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