If so, adding some randomness in the decision process would suffice to
counter the adversarial input argument you raised.
This is specifically addressed by the paper. Indeed, randomly choosing
a pivot is a common strategy. It won't fix the problem.
Too bad. I must admit that I do not see how to build a test case which
would trigger a worst case behavior against a qsort which chooses the
pivot randomly, but I have not read the paper, and possibly there is an
element of context which is eluding me.
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