Package g0401_0500.s0450_delete_node_in_a_bst

Class Solution

java.lang.Object

g0401_0500.s0450_delete_node_in_a_bst.Solution

public class Solution
extends Object

450 - Delete Node in a BST.<p>Medium</p> <p>Given a root node reference of a BST and a key, delete the node with the given key in the BST. Return the root node reference (possibly updated) of the BST.</p> <p>Basically, the deletion can be divided into two stages:</p> <ol> <li>Search for a node to remove.</li> <li>If the node is found, delete the node.</li> </ol> <p><strong>Example 1:</strong></p> <p><img src="https://assets.leetcode.com/uploads/2020/09/04/del_node_1.jpg" alt="" /></p> <p><strong>Input:</strong> root = [5,3,6,2,4,null,7], key = 3</p> <p><strong>Output:</strong> [5,4,6,2,null,null,7]</p> <p><strong>Explanation:</strong></p> <pre><code> Given key to delete is 3. So we find the node with value 3 and delete it. One valid answer is [5,4,6,2,null,null,7], shown in the above BST. Please notice that another valid answer is [5,2,6,null,4,null,7] and it's also accepted. </code></pre> <p><img src="https://assets.leetcode.com/uploads/2020/09/04/del_node_supp.jpg" alt="" /></p> <p><strong>Example 2:</strong></p> <p><strong>Input:</strong> root = [5,3,6,2,4,null,7], key = 0</p> <p><strong>Output:</strong> [5,3,6,2,4,null,7]</p> <p><strong>Explanation:</strong> The tree does not contain a node with value = 0.</p> <p><strong>Example 3:</strong></p> <p><strong>Input:</strong> root = [], key = 0</p> <p><strong>Output:</strong> []</p> <p><strong>Constraints:</strong></p> <ul> <li>The number of nodes in the tree is in the range <code>[0, 10⁴]</code>.</li> <li><code>-10⁵ <= Node.val <= 10⁵</code></li> <li>Each node has a <strong>unique</strong> value.</li> <li><code>root</code> is a valid binary search tree.</li> <li><code>-10⁵ <= key <= 10⁵</code></li> </ul> <p><strong>Follow up:</strong> Could you solve it with time complexity <code>O(height of tree)</code>?</p>

Constructor Summary

Constructors

Constructor	Description
Solution()

Method Summary

Modifier and Type	Method	Description
TreeNode	deleteNode(TreeNode root, int key)

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

deleteNode

public TreeNode deleteNode(TreeNode root,
 int key)