use strict;
use warnings;
my %hash;
m/(\d+),(\d+)/ and push(@{$hash{$1}}, $2) for <DATA>;
for (sort keys %hash) {
print "$_ => ";
print "$_ " for sort @{$hash{$_}};
print "\n";
}
__DATA__
2,6
2,3
1,2
2,5
1,3
1,4
This creates a hash with the first value as key and all the second values pushed into nested arrays. Sorting and printing is simple, as seen above.
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