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71. Given a binary tree, find out the maximum sum of value from root to each leaf
Objective:  Find the maximum sum leaf to root path in a Binary Tree. Means in all the paths from root to leaves, find the path which has the maximum sum.
Example:
Approach:
This solution will be divided into two parts
Find the leaf which has the maximum sum from root.
 Take a global variable maxLeaf and maxSum. (this maxLeaf will the node which has the maximum sum path and maxSum will the maximum sum.)
 Do the preorder traversal
 At each node, maintain a another variable sum = sum + root.data.
 Whenever you reach any leaf, check if sum>maxSum, if yes then update the maxLeaf and maxSum.
Print the path from root to that leaf.
Please refer this link to print the path.
Output:
Maximum Sum Leaf to Root path :18 Path : 8 6 3 1