Party At Anwesha

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A party has been organised after the successful launching of Codechef Chapter at IIT Patna. There are a total of n people attending the party. Everyone wishes to talk and shake hand with each other atleast once. Which means, for every pair of people (i,j), there should be at least one hand-shake. To ensure this, organisers decided to split n people into two groups each of size n/2 (n is guarantee

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solution.cppC++17

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