南方人物周刊：书里有哪一篇是你特别想表达，或者写起来很困难的吗？
This is saying that the rounded-up number may be equal to the ideal solution needed to match r exactly, or it might overshoot the target, but always by less than the minimum possible increment of the numerator in the a / b fraction.
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def value(self) - T:
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