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Find the Distance between Two Nodes of a Binary Tree.
Objective:  Given nodes in a binary tree, find the distance between them.
Example :
Approach:
 Distance(X, Y) = Distance(root, X) +Distance(root, Y)  2*(Distance(root to LCA(X,Y)
 where LCA(X,Y) = Lowest Common Ancestor of X,Y
 In the above example if Distance(20,45) = 3
 Distance(root, 20) = 2
 Distance(root, 45) = 3
 LCA(20, 45) = 10
 Distance(root, 10) = 1
 Distance(20,45) = 2+3  2*1 = 3
Now the problem is reduced to How to find distance from root to any given node and How to find Lowest Common Ancestor of two given nodes.
Code:
Output:
Distance between 45 and 20 is : 3
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