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104. Maximum Depth Of Binary Tree

Tree Depth-First Search Breadth-First Search Binary Tree

Problem - Maximum Depth Of Binary Tree

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

Solutions

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# 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 root is None:
            return 0
        left, right = self.maxDepth(root.left), self.maxDepth(root.right)
        return max(left, right) + 1

Submission Stats:

  • Runtime: 0 ms (100.00%)
  • Memory: 19.2 MB (29.83%)