Half Blood Prince

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*"People find it far easier to forgive others for being wrong than being right.”* Professor Slughorn returned to Hogwarts as an Arithmetic teacher. For the entire year, he gave his students a sequence of $N$ numbers and told them to bring these numbers for each of his class. He took $Q$ classes in the entire year. In each class, he gave them a number $k$. He asked them to find the number of pos

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solution.cppC++17

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