Apartment

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There is a building consisting of 10 000 apartments numbered from 1 to 10 000, inclusive. Call an apartment boring, if its number consists of the same digit. Examples of boring apartments are 11,2,777,9999 and so on. Our character is a troublemaker, and he calls the intercoms of all boring apartments, till someone answers the call, in the following order: First he calls all apartments consistin

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solution.cppC++17

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