a year ago i wrote this perl program as part of a larger program.
as a exercise of fun, let's do a python version. I'll post my version
later today.
=pod
combo(n) returns a collection with elements of pairs that is all
possible combinations of 2 things from n. For example, combo(4)
returns {'3,4' => ['3',4],'1,2' => [1,2],'1,3' => [1,3],'1,4' =>
[1,4],'2,3' => ['2',3],'2,4' => ['2',4]}; Hash form is returned
instead of array for this program.
=cut
sub combo ($) {
my $max=$_[0];
my %hh=();
for (my $j=1; $j < $max; ++$j) {
for (my $i=1; $i <= $max; ++$i) {
my $m = (($i+$j)-1)%$max+1;
if ($i < $m){ $hh{"$i,$m"}=[$i,$m];}
}
}
return \%hh;
}
use Data::Dumper;
$Data::Dumper::Indent=0;
print Dumper combo(5);
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