Chef and Cook-Off Contests

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Chef wants to prepare a Cook-Off contest with 5 problems chosen from a set of N problems. He has marked the difficulty of each problem within a range identified by one of the following strings: "cakewalk", "simple", "easy", "easy-medium", "medium", "medium-hard", "hard". According to this page, a Cook-Off contest must have problems of the following difficulties: - exactly one "cakewalk"; - exact

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solution.cppC++17

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