Casey and Gifts

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Casey has been invited to a Christmas party. She observes $N$ people for sometime and realizes that people are exchanging gifts within some group such that no two person from different group have exchanged a gift. She has noted down all $M$ exchanges that took place till now and would like your help to know the total number of such groups. ###Input: - First line contains two integer $N$ a

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solution.cppC++17

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