The one with Rachels Obsession

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Everyone knows Rachel is not good with numbers, whenever she has such problems, she gives them to Chandler. Currently Rachel has set of numbers from 1...2*n, and they are available to her in n groups [ (a1,b1),(a2,b2),(a3,b3),.......,(an,bn) ], She has some problems to be solved and so she is waiting for Chandler and she is bored, So she made herself a game, She calls a sequence of pairs cool if

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solution.cppC++17

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