Minimum Subtree Cover

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### Read problem statements in [Vietnamese](https://www.codechef.com/download/translated/JUNE21/vietnamese/SUBTRCOV.pdf), You are given a tree with $n$ vertices (numbered $1, 2, \dots, n$) and an integer $k$. A subtree is defined as a connected subgraph of the tree. That is, a subtree is another tree that can be obtained by removing some (possibly none) vertices and all edges incident to tho

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solution.cppC++17

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