Garv and Lottery Tickets

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There are $N$ lottery tickets with numbers written on them. Garv wants to buy some lottery tickets, but he is kind of superstitious. He has a lucky digit $X$, and he wants you to answer $Q$ queries before he buys the tickets. Each query will contain 2 numbers $L$ and $R$. You will need to output the sum of occurrences of the digit $X$ in the numbers between positions $L$ and $R$ (both inclusive)

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solution.cppC++17

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