Researchers studied more than one hundred fifty patients whose condition had failed to improve after taking at least one drug.

VOA: special.2010.03.02

So the basic idea was fine, but I failed to satisfy the initial condition that the answer had to be between the lower bound and the upper bound. Right?

因此基础的思想是对的，但是程序没能满足,正确答案在给定的区间内这个条件,对不对？

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