Leetcode 124. Binary Tree Maximum Path Sum in Python | Python Leetcode | Python Coding Tutorial

Leetcode 124. Binary Tree Maximum Path Sum in Python | Python Leetcode | Python Coding Tutorial

A path in a binary tree is a sequence of nodes where each pair of adjacent nodes in the sequence has an edge connecting them. A node can only appear in the sequence at most once. Note that the path does not need to pass through the root.
The path sum of a path is the sum of the node's values in the path.
Given the root of a binary tree, return the maximum path sum of any non-empty path.

Example 1:
Input: root = [1,2,3]
Output: 6
Explanation: The optimal path is 2 to 1 to 3 with a path sum of 2 + 1 + 3 = 6.

Example 2:
Input: root = [-10,9,20,null,null,15,7]
Output: 42
Explanation: The optimal path is 15 to 20 to 7 with a path sum of 15 + 20 + 7 = 42.

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