Article From:https://www.cnblogs.com/grandyang/p/9062143.html

Given a Binary Search Tree (BST) with the root node `root`

, return the minimum difference between the values of any two different nodes in the tree.

Example :

Input: root = [4,2,6,1,3,null,null] Output: 1 Explanation: Note that root is a TreeNode object, not an array. The given tree [4,2,6,1,3,null,null] is represented by the following diagram: 4 / \ 2 6 / \ 1 3 while the minimum difference in this tree is 1, it occurs between node 1 and node 2, also between node 3 and node 2.

Note:

- The size of the BST will be between 2 and
`100`

. - The BST is always valid, each node’s value is an integer, and each node’s value is different.

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Link of this Article: Minimum distance of nodes in [LeetCode] Minimum Distance Between BST Nodes two fork search tree