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Erg, teach me to start optimising in the most stupdi places. I have modded my code to loop like yours, and moved my hash creation outside the inner loop (what a dummy!) and ditched the sub (which was mostly there for clarity, anyway). Then we get:
my $out; for my $i (0 .. $#lines) { my %words1 = map { $_ => 1 } split /_/, $lines[$i]; for my $j($i + 1 .. $#lines) { if (1 < grep $words1{$_}, split /_/, $lines[$j]) { $out .= "$lines[$i] and $lines[$j]\n"; } } } $out;


Faster! Benchmark:
Benchmark: running bmann, jasper, rev for at least 3 CPU seconds... bmann: 3 wallclock secs ( 3.17 usr + 0.00 sys = 3.17 CPU) @ 88 +28.71/s (n=27987) jasper: 3 wallclock secs ( 3.15 usr + 0.00 sys = 3.15 CPU) @ 10 +860.32/s (n=34210) rev: 3 wallclock secs ( 3.17 usr + 0.00 sys = 3.17 CPU) @ 22 +06.94/s (n=6996)

In reply to Re^2: nested combinations: algorithm advice? by Jasper
in thread nested combinations: algorithm advice? by revdiablo

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