CF1036C Classy Numbers

Let's call some positive integer classy if its decimal representation contains no more than $ 3 $ non-zero digits. For example, numbers $ 4 $ , $ 200000 $ , $ 10203 $ are classy and numbers $ 4231 $ , $ 102306 $ , $ 7277420000 $ are not. You are given a segment $ [L; R] $ . Count the number of classy integers $ x $ such that $ L \le x \le R $ . Each testcase contains several segments, for each of them you are required to solve the problem separately.

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