Ant man and the handshake cabin

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###Question: Our little ant-man is now currently in the quantum realm. He is waiting for a portal to open so that he can escape from the quantum realm. In our real world, there are $n$ persons numbered from *1 to n* in a special cabin. The uniqueness of the cabin is that when two persons shake hands, a portal will open on the hand of a person in the cabin just before it ( not necessarily those w

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solution.cppC++17

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