Chef and his quest for a date

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Chef while sitting at a coffee shop sees a girl making horizontal and vertical lines on a rectangular sheet of paper and then doing some counting. Chef being a maths freak, gathers courage and walks up to the girl to inquire what she is upto. The girl tells Chef that she has been given an arduous task of making M and N number of horizontal and vertical lines respectively on the sheet of paper and

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solution.cppC++17

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