CRITICAL NODE

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Given a tree (with root as 1) with $N$ as number of nodes, $N - 1$ edges and array $Val$ denoting the $Value$ assigned to each $node$. Also given an integer $S$, you can remove a single node from the tree and destroy it, after destroying the selected node, lets say A be the number of ordered pairs of nodes $(U,V)$, such that $Val[U] + Val[V] = S$ and $U$ is reachable to $V$ and vice versa, l

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solution.cppC++17

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