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📌 Delete Node in a Binary Search Tree | LeetCode Explained

In this video, we solve the Delete Node in a Binary Search Tree problem from LeetCode.
Given the root of a BST and a key, the task is to delete the node with that key while maintaining BST properties.

🔍 Problem Overview

Input: Root of a Binary Search Tree and a key to delete

Output: Root of the updated BST

The BST structure must remain valid after deletion

💡 Approach Explained

We handle three possible cases when deleting a node:

Node has no child (leaf node) → simply remove it

Node has one child → replace the node with its child

Node has two children →

Find the inorder successor (smallest value in right subtree)

Replace the node’s value with the successor

Delete the successor node

⏱️ Time & Space Complexity

Time Complexity: O(h), where h is the height of the tree

Space Complexity: O(h) due to recursion stack

✅ Key Concepts Covered

Binary Search Tree properties

Inorder successor

Recursive tree modification

Handling edge cases

🎯 Why Watch This Video?

✔ Clear explanation of all deletion cases
✔ Step-by-step logic
✔ Clean and interview-ready code
✔ Common BST interview problem
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