Yeah, I thought about rewriting in C, maybe using glib to get nice hashes and strings. Memory usage would be way smaller and it would be way faster but it wouldn't be much fun to write :)

I just got 

fergal@anacreon:~$ time ./lr
14479062751

real    76m17.183s
user    75m32.075s
sys     0m0.764s

fergal@anacreon:~$ time perl make_ways.pl
14479062752

real    37m46.569s
user    37m26.124s
sys     0m1.416s

[download]

That's without -march=... and -fomit-doodads.

In reply to Re^13: Challenge: Number of unique ways to reach target sum by fergal
in thread Challenge: Number of unique ways to reach target sum by Limbic~Region

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