#!/usr/bin/perl                                                                                
use Benchmark qw ( :hireswallclock cmpthese timethese );
use strict;
# use warnings;
use Set::Scalar;
use Data::Dumper;
use List::Compare;

our @arcb = ( 450, 625, 720, 645 );
our @arca = ( 625, 645 );

sub davido {
    our @arcb;
    our @arca;
    @arcb = do {
        my %exclude;
        @exclude{@arca} = ();
        grep { !exists $exclude{$_} } @arcb;
    };
    # print "@arcb\n";
}

sub karlgoethebier {
    our @arcb;
    our @arca;
    my $s1   = Set::Scalar->new(@arcb);
    my $s2   = Set::Scalar->new(@arca);
    @arcb = @{ $s1 - $s2 };
    # print Dumper( \@arcb );
}

sub Lotus1 {
    our @arcb;
    our @arca;
    my $lc = List::Compare->new( \@arca, \@arcb );
    @arcb = $lc->get_Ronly;
    # print "arcb: @arcb\n";
}

sub LanX {
    my ( %arcb, %arca );
    our @arcb;
    our @arca;
    @arcb{@arcb} = ();
    @arca{@arca} = ();
    delete @arcb{@arca};
    @arcb = keys %arcb;
    # print Dumper( \@arcb );
}

sub linuxer {
    our @arcb;
    our @arca;
    my %unwanted; 
    $unwanted{$_}++ for @arca;
    @arcb = grep { !$unwanted{$_} } @arcb;
    # print "@arcb\n";
}

sub nithins {
    our @arcb;
    our @arca;
    foreach my $a (@arca) {
        for ( my $i = 0 ; $i < scalar(@arcb) ; $i++ ) {
            delete $arcb[$i] if ( $a == $arcb[$i] );
        }
    }
    # print "@arcb";
}

# karlgoethebier;
# Lotus1;
# LanX;
# davido;
# linuxer;
# nithins;

my $results = timethese(
    -10,
    {
        'karlgoethebier' => 'karlgoethebier',
        'Lotus1'         => 'Lotus1',
        'LanX'           => 'LanX',
        'davido'         => 'davido',
        'linuxer'        => 'linuxer',
        'nithins'        => 'nithins',
    }
);

cmpthese($results);


__END__


    Benchmark: running LanX, Lotus1, davido, karlgoethebier, linuxer, nithins for at least 10 CPU seconds...
    LanX: 10.513 wallclock secs (10.51 usr +  0.00 sys = 10.51 CPU) @ 378147.76/s (n=3974333)
    Lotus1: 10.4951 wallclock secs (10.49 usr +  0.00 sys = 10.49 CPU) @ 23020.02/s (n=241480)
    davido: 10.5748 wallclock secs (10.58 usr +  0.01 sys = 10.59 CPU) @ 378623.51/s (n=4009623)
    karlgoethebier: 10.4698 wallclock secs (10.47 usr +  0.00 sys = 10.47 CPU) @ 9713.28/s (n=101698)
    linuxer: 10.4635 wallclock secs (10.46 usr +  0.00 sys = 10.46 CPU) @ 434439.87/s (n=4544241)
    nithins: 10.612 wallclock secs (10.61 usr +  0.00 sys = 10.61 CPU) @ 589604.05/s (n=6255699)
                   Rate karlgoethebier   Lotus1     LanX  davido linuxer nithins
karlgoethebier   9713/s             --     -58%     -97%    -97%    -98%    -98%
Lotus1          23020/s           137%       --     -94%    -94%    -95%    -96%
LanX           378148/s          3793%    1543%       --     -0%    -13%    -36%
davido         378624/s          3798%    1545%       0%      --    -13%    -36%
linuxer        434440/s          4373%    1787%      15%     15%      --    -26%
nithins        589604/s          5970%    2461%      56%     56%     36%      --