The Enigma - 3

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Alan : Look at this, a new enigma machine! It's quite difficult to understand this one. Miu : How about destroying it for fun. (Awkward Silence) The machine consists of $N$ nodes connected with $N - 1$ undirected edges. (It has a structure of a Tree) Each of the nodes consists of one lowercase alphabet. (a to z) Let us denote the alphabet present with the $i$th node as $A$$i$. Miu & Alan don't k

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solution.cppC++17

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