Here is the interview question prompt, presented for reference.

Diameter of Binary Tree

Let's find out the length of the diameter of the tree!

This is a simple binary tree question that is frequently asked in interviews. So let's see how we can solve this problem.

Prompt

Given the root of a binary tree, return the length of the diameter of the tree.

The diameter of a binary tree is the length of the longest path between any two nodes in a tree. This path may or may not pass through the root.

Note: The length of a path between two nodes is represented by the number of edges between them.


Given the Binary Tree above as the problem where,

Input: root = [1, 2, 3, 4, 5]

Output: length = 3

We get to solution three by taking the paths a, b, and c or d, b, and c, as shown in the image below:

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Constraints

• The number of nodes in the tree is in the range [1, 10^4) ].
• -100 <= Node.val <= 100

You can see the full challenge with visuals at this link.