To count number of quadruplets with sum = 0

[Paul Rubin]

"n00m" <n00m at narod.ru> writes:
> Two first outputs is of above (your) code; next two - of my code:

Yeah, I see now that we both used the same algorithm.  At first glance
I thought you had done something much slower.  The 10 second limit
they gave looks like they intended to do it about this way, but with a
compiled language.  68 seconds isn't so bad for 4000 entries in pure
CPython.  Next thing to do I think is use psyco or pyrex.