Disappearing Numbers

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A pool of numbers are there which are arbitrary decimal fractions from the interval (0,1). In the first round of the game the middle third of the interval disappears, and the numbers from this interval are eliminated from the pool. In the first round the the interval [1/3, 2/3] is eliminated and in the second round the two intervals [1/9, 2/9] and [7/9, 8/9] are eliminated, and so on. The endpoint

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solution.cppC++17

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