Find out the absent Student

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Today is the first day of your college, and $N$ students have taken admission in your branch. At the end of your first class, the class coordinator gets to know that one student is absent. He decided to find out the roll number of that student. He asks the roll number of each student and writes it down. Help your class coordinator to find out the roll number of that student. ###Input:

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solution.cppC++17

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