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135. Print All Paths From Root In a Binary Tree Whose Sum is Equal to a Given Number
Objective:  Given a binary tree and X, write an algorithm to Print all the paths starting from root so that sum of all the nodes in the path equals a given number.
Example:
Approach:
 Create a global variable as String = path.
 Do the preorder
 if root is greater than Sum required, return.
 If not then, add root to the path and update the required sum (sum=sumroot.data).
 if sum required =0, means we have found the path, print it.
 See the code for better understanding.
Code:
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