Delete Last of a Doubly Linked List

Insert In BST (Python)

Deletion in BST.

Serialize and Deserialize Binary Tree

LCA in BST – Lowest Common Ancestor in Binary Search Tree

Check if a Binary Tree is BST or not

Morris traversal for Inorder

Diameter of a Binary Tree.

Level Order Traversal.

Flattening a Linked List.

Merge K sorted linked list

Palindrome Linked Lists

Merge two sorted linked list