use strict;
use warnings;

use File::Find;
use Benchmark qw { cmpthese };

my %files = ();

my $rcWanted = sub
   {
       $files{ $File::Find::name } =
          ( lstat $File::Find::name )[ 9 ];
   };

find( $rcWanted, q{/usr/bin} );

cmpthese(
   -5,
   {
       Direct => sub { my $raSorted = useDirect() },
       ST     => sub { my $raSorted = useST() },
   }
   );

sub useDirect
{
    my @sorted =
       sort { $files{ $b } <=> $files{ $a } }
       keys %files;
    return \ @sorted;
}

sub useST
{
    my @sorted =
       map  { $_->[ 0 ] }
       sort { $b->[ 1 ] <=> $a->[ 1 ] }
       map  { [ $_, $files{ $_ } ] }
       keys %files;
    return \ @sorted;
}