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One day, Rick was given the following problem from Morty: You are given a tree with N vertices and an integer $K$. The vertices are numbered $1$ through $N$. The edges are represented by pairs of integers $(ai,bi)$. For a set $S$ of vertices in the tree, let $f(S)$ be the minimum number of the vertices in a subtree of the given tree that contains all vertices in $S$. There are $\binom{N}{K}$ ways

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solution.cppC++17

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