Maximum Depth of Binary Tree

Question

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What is the maximum depth of a given binary tree?

Example 1

Input: [3,9,20,null,null,15,7]

Output: 3

Solution

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all//Maximum Depth of Binary Tree.py

# 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):
        if not root:
            return 0

        left_depth = self.maxDepth(root.left)
        right_depth = self.maxDepth(root.right)

        return max(left_depth, right_depth) + 1

▯

all//Maximum Depth of Binary Tree.py

# 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):
        if not root:
            return 0

        left_depth = self.maxDepth(root.left)
        right_depth = self.maxDepth(root.right)

        return max(left_depth, right_depth) + 1