Sereja and Line

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Sereja is hosting his birthday dinner. He invited his N close friends. Let us number the people from 1 to N according to the order in which they arrive at the event. The dinner is being held in long straight corridor in which people sit in a way such that they won't leave any empty space in between two consecutive persons at any given time. When a person number i arrives at the corridor, he must

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solution.cppC++17

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