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73. Lowest Common Ancestor in a Binary Search Tree.
Objective:  Find the Lowest Common Ancestor of two given nodes in a Binary Search Tree
What is Lowest Common Ancestor
In a given binary tree, The lowest common ancestor of two nodes n1 and n2 will be a node X such that node X will be the lowest node who has n1 and n2 as its descendants.
Similar Problem: Lowest Common Ancestor in a Binary Tree ( Not Binary Search Tree).
Example:
Input: A binary Search Tree and two nodes n1 and n2.
Appraoch:
 Start will the root.
 If root>n1 and root>n2 then lowest common ancestor will be in left subtree.
 If root<n1 and root<n2 then lowest common ancestor will be in right subtree.
 If Step 2 and Step 3 is false then we are at the root which is lowest common ancestor, return it.
Output:
RecursiveLowest Common Ancestor of Nodes 5 and 14 is : 10 IterativeLowest Common Ancestor of Nodes 5 and 14 is : 10