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Find the Closest Element in BST
Medium Accuracy: 49.94% Submissions: 25504 Points: 4

Given a BST and an integer. Find the least absolute difference between any node value of the BST and the given integer.

Example 1:

Input:
        10
      /   \
     2    11
   /  \ 
  1    5
      /  \
     3    6
      \
       4
K = 13
Output: 2
Explanation: K=13. The node that has
value nearest to K is 11. so the answer
is 2

Example 2:

Input:
      8
    /   \
   1     9
    \     \
     4    10
    /
   3
K = 9
Output: 0
Explanation: K=9. The node that has
value nearest to K is 9. so the answer
is 0.

Your Task:
You don't need to read input or print anything. Your task is to complete the function
minDiff() that takes the root of the BST and an integer K as its input and returns the minimum absolute difference between any node value of the BST and the integer K.

Expected Time Complexity: O(Height of the BST).
Expected Auxiliary Space: O(Height of the BST).

Constraints:
1 <= Number of nodes <= 100000

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Find the Closest Element in BST

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