0530. Minimum Absolute Difference in BST

https://leetcode.com/problems/minimum-absolute-difference-in-bst

Description

Given the root of a Binary Search Tree (BST), return the minimum absolute difference between the values of any two different nodes in the tree.

Example 1:

**Input:** root = [4,2,6,1,3]
**Output:** 1

Example 2:

**Input:** root = [1,0,48,null,null,12,49]
**Output:** 1

Constraints:

• The number of nodes in the tree is in the range [2, 104].

• 0 <= Node.val <= 105

Note: This question is the same as 783: https://leetcode.com/problems/minimum-distance-between-bst-nodes/

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