Sum Of Nodes

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Given a binary tree, find and return the sum of all nodes.

Input format :

Elements in level order form (separated by space). If any node does not have left or right child, take -1 in its place.

Sample Input :
5 6 10 2 3 -1 -1 -1 -1 -1 9 -1 -1
Sample Output :
35

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