If you don't care how you get the results, then this works (if I read your problem statement correctly). It uses
List::Compare from CPAN.
#!usr/bin/perl
use strict;
use warnings;
use feature 'say';
use Data::Dumper::Simple;
use List::Compare;
my @dead_list = (100,
101,
103,
200,
201,
202,
203,
210,
211,
212,
220,
221,
222,
230,
231,
232,
233,
240,
241,
242,
243,
1000,
1001,
1002,
1010,
1011,
1012,
1020,
1021,
1022,
1120,
1121,
1122,
1210,
1211,
1212);
my @get_list = (
'100',
'200',
'210',
'220',
'230',
'240',
'1000',
'1001',
'1002',
'1120',
'1210',);
my $lc = List::Compare->new(\@dead_list, \@get_list);
my @result = $lc->get_unique;
say Dumper(@result);
__END__
@result = (
'101',
'1010',
'1011',
'1012',
'1020',
'1021',
'1022',
'103',
'1121',
'1122',
'1211',
'1212',
'201',
'202',
'203',
'211',
'212',
'221',
'222',
'231',
'232',
'233',
'241',
'242',
'243'
);
Cheers,
Brent
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