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Maximum Value in a Binary Tree

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Problem statement

Given the root of a nonempty binary tree, return the maximum value stored in any node.

Your implementation must handle trees whose values are all negative.

Function

findMaximumValue(root: TreeNode) → int

Examples

Example 1

root = [3,1,5,null,2,4,8]return = 8

The largest node value is 8.

Example 2

root = [-8,-12,-3]return = -3

All values are negative, so the least negative value is the maximum.

Constraints

The tree contains from 1 through 10^5 nodes.
-10^9 <= Node.val <= 10^9.