Freaks of the Number Universe

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Now it has all come down to choosing the best planets for our future to settle in. Dr Brand makes an interesting observation: any constellation that forms a k-primal tree when the closest stars are connected, will have an abundance of resources. - A tree is called $0$-primal, if it consists of a single isolated root node. - Call a tree $k$-primal if it consists of a root node having a prime numb

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solution.cppC++17

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