543. Diameter of Binary Tree — LeetCode(Python)


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

Input: root = [1,2,3,4,5]
Output: 3
Explanation: 3 is the length of the path [4,2,1,3] or [5,2,1,3].
Input: root = [1,2]
Output: 1
  • The number of nodes in the tree is in the range [1, 104].
  • -100 <= Node.val <= 100


Explanation —

We can use a depth-first search (DFS) traversal algorithm to solve this problem.

Time Complexity —

Since we are visiting each node only a constant number of times, we can say that our algorithm requires a linear amount of time to run.

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