Product of Digits

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The natural numbers begin from 1 and go on up to $∞$. Given $N$ indices, find the product of the digits that lie on those indices. **NOTE**: - Consider that the natural numbers are zero-indexed i.e. the index of the first number in the set of natural numbers is 0, the index of the second number is 1 and so on. - Consider that all the natural numbers are written like a string '12345678910

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solution.cppC++17

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