Empty flat

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Daily, Meena leaves for his office at 10 am. On his way sees a building of $N$ with $F$ flats on each floor. Meena loves this building so much. He wants to buy a flat in this building. Daily he thinks of enquiring about any empty flats in that building, but he is unable to find time from his busy schedule. After a few days, he notices that some windows are open while some are always closed in the

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solution.cppC++17

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