Very nice. I tried several times without success to come
up with a good non-recursive solution. The above not only
is short, but it really does the binary search, and
applying standard golfing techniques, it comes up a
winner at 55:
(Or 57 if you add my
to kill side effects. Still
better than anything I thought of.)
Note that this is much less readable than what tye
wrote, but every transformation is fairly mechanical
compression of the code...
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