Ross and DFS

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Your are given a complete binary tree with n levels. $Ross$ applies Depth-first-Search(DFS) on the tree and numbers the nodes in increasing order starting from root node. **He prioritises visiting left node over right node for visiting when both left and right child nodes of a node are univisited**. A node will be numbered only when it is visited for the first time. After numbering a node, he will

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solution.cppC++17

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