#!/usr/bin/env perl -l
use strict;
use warnings;
my @initial = qw{q w e r t y q w e r t y};
print "Initial: @initial";
my $last = '';
my @unique = map { $last eq $_ ? () : ($last = $_) } sort @initial;
print "Unique: @unique";
####
Initial: q w e r t y q w e r t y
Unique: e q r t w y
##
##
#!/usr/bin/env perl -l
use strict;
use warnings;
my $last = '';
my @unique = map { $last eq $_ ? () : ($last = $_) } sort map { split } ;
print "Unique: @unique";
__DATA__
I am supposed to create a unique array
I am not supposed to use hashes
##
##
Unique: I a am array create hashes not supposed to unique use