Slightly contrived single line solution:
#!/usr/bin/perl
use strict;
use warnings;
$_ = '1:1,2:1,3:2,500:2,505:1';
my (@array, %hash);
%hash = map { my @x = split /:/; push @array, $x[0]; @x } split /,/;
use Data::Dumper;
print Dumper \@array, \%hash;
--
< http://www.dave.org.uk>
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