DUCT in IIST

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As summer has arrived, administration of *Indore Institute of Science and Technology* decided to setup [duct](https://en.wikipedia.org/wiki/Duct_(flow)) in all the classrooms of IIST. There are three floors in IIST (Ground floor, first and second floor) and each floor consists of 2 Blocks (A and C Block) where classrooms are built. Each Block has $N$ classrooms in continuous manner (i.e, conn

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solution.cppC++17

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