Chef and Digits

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Chef loves integers, but of course not all of them. For some personal reason, he considers the integers a0, a1, ..., and a9 unlucky. If for an integer x, suppose there exists some digit i (0 ≤ i ≤ 9) which appears exactly ai times in the decimal presentation of x (without leading zeros), then Chef dislikes x. Otherwise Chef loves it. Chef wants to count the number of the integers between L and R,

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L1 Observation

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solution.cppC++17

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