On 24 Oct 2013, at 11:34, Phillip Lord <phillip.l...@newcastle.ac.uk> wrote:

> What does Scala do? I mean, given that it doesn't have the same problem,
> perhaps it has a solution?

By default, Scala uses a tree-based set, not a hash-based set. So the fact that 
it doesn't run into hashing issues isn't surprising (and is yet another example 
of how this isn't a perfect apples-to-apples comparison). 

However, I've just tried rerunning the Scala using a hash-based set 
implementation, and that takes the runtime down from around 2.5 minutes to just 
over 2.

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