Hand Shake

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Alan threw a party and invited all her close friend to it. Let us suppose there were 2n people in the party and all of them were sitting across a round table. The host asked them to shake hands with the condition that no two hands should cross each other i.e if 4 people are sitting then 1st person cannot shake hands with 3rd as that will cross with the hands of 2nd and 4th person. The host wants

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solution.cppC++17

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