LC: 270. Closest Binary Search Tree Value

270. Closest Binary Search Tree Valuee

Given the root of a binary search tree and a target value, return the value in the BST that is closest to the target.

Example 1:

Input: root = [4,2,5,1,3], target = 3.714286
Output: 4

Example 2:

Input: root = [1], target = 4.428571
Output: 1

Constraints:

  • The number of nodes in the tree is in the range [1, 104].

  • 0 <= Node.val <= 109

  • -109 <= target <= 109

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