Roger Hui:
> Hmm, doing name=: p{name in O(1) space and O(n)
> time looks challenging. At this point I don't see
> how. I think I need one bit per item to indicate
> that the item has already been processed.
Don't give up, keep looking. It is 5.2[10] and it is rated at just 25
There are 2 subcases -- when you can discard p and when you cannot, second
being slightly worse.
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