Package g0201_0300.s0230_kth_smallest_element_in_a_bst

Class Solution

java.lang.Object

g0201_0300.s0230_kth_smallest_element_in_a_bst.Solution

public class Solution
extends Object

230 - Kth Smallest Element in a BST.<p>Medium</p> <p>Given the <code>root</code> of a binary search tree, and an integer <code>k</code>, return <em>the</em> <code>k^th</code> <em>smallest value ( <strong>1-indexed</strong> ) of all the values of the nodes in the tree</em>.</p> <p><strong>Example 1:</strong></p> <p><img src="https://assets.leetcode.com/uploads/2021/01/28/kthtree1.jpg" alt="" /></p> <p><strong>Input:</strong> root = [3,1,4,null,2], k = 1</p> <p><strong>Output:</strong> 1</p> <p><strong>Example 2:</strong></p> <p><img src="https://assets.leetcode.com/uploads/2021/01/28/kthtree2.jpg" alt="" /></p> <p><strong>Input:</strong> root = [5,3,6,2,4,null,null,1], k = 3</p> <p><strong>Output:</strong> 3</p> <p><strong>Constraints:</strong></p> <ul> <li>The number of nodes in the tree is <code>n</code>.</li> <li><code>1 <= k <= n <= 10⁴</code></li> <li><code>0 <= Node.val <= 10⁴</code></li> </ul> <p><strong>Follow up:</strong> If the BST is modified often (i.e., we can do insert and delete operations) and you need to find the kth smallest frequently, how would you optimize?</p>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
int	kthSmallest(TreeNode root, int k)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Solution

public Solution()

Method Details

kthSmallest

public int kthSmallest(TreeNode root,
 int k)