Alex and Cells

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Its the first day of office for Alex as a prison officer. We have N ID cards numbered $(1,2,3,4.....N)$ and $M$ cells with 2 numbers $L$ and $R$. Every cell of the prison can be opened with a card with ID with a number $ i $ iff $L \leq i \leq R$ Now Alex is very lazy. He does not want to carry more than 1 ID card. So ,he asks you to help him. Find the number of IDs which can be used t

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solution.cppC++17

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