#LeetCode: Kth Smallest Element in a BST

Also Check: Solutions Of May LeetCoding Challenge (2020)

Given a binary search tree, write a function kthSmallest to find the kth smallest element in it.

Note:
You may assume k is always valid, 1 ≤ k ≤ BST's total elements.

Example 1:
Input: root = [3,1,4,null,2], k = 1
   3
  / \
 1   4
  \
   2
Output: 1
Example 2:
Input: root = [5,3,6,2,4,null,null,1], k = 3
       5
      / \
     3   6
    / \
   2   4
  /
 1
Output: 3


Follow up:
What if the BST is modified (insert/delete operations) often and you need to find the kth smallest frequently? How would you optimize the kthSmallest routine?

GIT URL: Java Solution Of Leet Code's Kth Smallest Element in a BST problem
Java Solution

ALSO CHECK: Other LeetCode Solutions in Java

-K Himaanshu Shuklaa.