Paul, your function solve returns a set of solutions, but there is nothing
on the program that seems to rely upon being able to quickly test whether a
particular solution is in such a set. Returning a sequence from solve is
much faster, since it avoids the PersistentHashSet hash collision issue
entirely.
Just replace #{#{}} with [#{}], and remove the call to 'set' in solve.
Andy
On Wed, Oct 23, 2013 at 9:18 AM, Paul Butcher <[email protected]> wrote:
> On 23 Oct 2013, at 17:06, Andy Fingerhut <[email protected]> wrote:
>
> I have instrumented a copy of Paul's Clojure program to print the hash
> code of all of the solutions in the set returned by solve, and there are
> *many* pairs of solutions that have identical hash values
>
>
> Aha! The smoking gun :-)
>
> Very many thanks, Andy.
>
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