Print the Vertical Sum in binary Tree .

Objective: – Given a binary tree, print it in vertical order sum

What is Vertical Order Sum

as you can see in the example above, [4],[2], [12],[3],[7] are the vertical order sum of the given binary tree.

Approach:

• Do the inorder traversal.
• Take a variable called level, when ever you fo left, do level++ AND when ever you go right do level–.
• With step above we have separated out the levels vertically.
• Now you need to add the elements of each level, so create a TreeMap and the (key,value) pair will be (level,Sum of elements).
• 

  Separate out the vertical levels

  At the end iterate through the TreeMap and print the results.

Complete Code:

Output:

Level -2 Sum : 7 
Level -1 Sum : 3 
Level 0 Sum : 12 
Level 1 Sum : 2 
Level 2 Sum : 4