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Re: Getting the intersection of n collections.

by dtr (Scribe)
on Oct 11, 2006 at 11:59 UTC ( #577591=note: print w/ replies, xml ) Need Help??


in reply to Getting the intersection of n collections.

Assuming that each number can only appear once in each list, then the following should work:-

my %counts = (); foreach my $val (@d1, @d2, @d3) { $counts{$val}++; } return grep { $counts{$_} == 3 } sort keys %counts;
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