Find The Student

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There are _n_ students in the class numbered _1_ to _n_. The teacher is collecting the homework assignments from the student in the class. But there is one student who has not completed the assignment and the teacher wants to find that student. The teacher has a list of values _a_i which denote the students who have submitted the assignment. This list might contain duplicates. Help the teacher

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solution.cppC++17

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