Books in Drawers

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There are $N$ number of drawers in a Library. The librarian has to go out for some reason so he decided to give some drawers under the care of his students. But the students are so lazy so only $M$ numbers of students become ready to take care. The librarian don't want to put burden on the students so he decided to assign one drawer to one students. Now the librarian decided to select $M$ drawers

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solution.cppC++17

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