The Queue of Doubts

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Everybody loves Praveen sir's classes. He explains stuff so well, one can't help but get engaged in the classes and listen to what he has to say. But every once in a while, there comes a difficult topic that he has to explain, and students get doubts. Praveen sir being the dedicated teacher that he is, wants to clear everyone's doubts. He knows the total number of students who have doubts - $N$

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solution.cppC++17

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