Enumeration of rationals

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It is well known that rational numbers form a countable set. Hence the set of rational numbers in the open interval (0,1) also form a countable set. Here we enumerate the rationals in (0,1) in the following fashion. First, every rational is expressed in the lowest terms : ie, as p/q where p and q are positive integers with no common factor other than one. Then we sort the fractions in the ascendi

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solution.cppC++17

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