Chain of Doughnuts

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There is new delicious item in Chef's menu - a doughnut chain. Doughnuts connected successively in line forming a chain. Chain of 3 doughnuts Chef has received an urgent order for making a chain of N doughnuts. He noticed that there are exactly N cooked doughnuts in the kitchen, some of which are already connected in chains. The only thing he needs to do is connect them in one chain. He can cut

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solution.cppC++17

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