Find the girl

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Amul went to a party at a friend's house where he found Shikha, he talked to her. Next morning he could only remember. - Digit key of her house number k. - Her house number lies between $L$ and R. You are his friend and, Amul asked you to help him to find her house. What is the probability that Amul will find her house. Note: - lets denote the digit key of x as f(x) then f(87) = f(8+7 = 15)

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solution.cppC++17

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