Adjacent Leaves

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Consider a rooted tree. A leaf in this tree is a vertex that does not have any children. Suppose that we perform a depth-first search from the root and write down the numbers of all leaves in the order in which they are visited. Since the order of visiting the sons of any vertex during the search is not fixed, many different sequences of leaves may be created. We call a subset of all leaves *good*

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solution.cppC++17

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