Chef and his Students

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Chef is instructor of the famous course "Introduction to Algorithms" in a famous univerisity. There are n students in his class. There is not enough space in the class room, so students sit in a long hallway in a linear fashion. One day Chef was late to class. As a result, some of the students have formed pairs and are talking to each other, while the others are busy studying. This information is

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solution.cppC++17

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