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Get the Sum of all left leaves in a Binary tree
Objective: Given a binary tree, find the sum of all the nodes which are left as well as leaves nodes.
Example:
Approach:
 The approach is quite simple.
 Do the inorder traversal
 check if node if the left child and leaf node.
 If yes then add it to the sum.
 See the code for more understanding.
Code:
Output:
Sum of left leaves: 21
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