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  1. #!/usr/bin/perl
  2. # your code goes here
  3.  
  4. use Data::Dumper;
  5.  
  6. my %session_called = ();
  7.  
  8. for my $sid (qw/1 2 3 1 1 1 3 4 5 2/) {
  9. 	$sesion_called{$sid} ++;
  10. }
  11. print Dumper(\%sesion_called) . "\n";
  12. print join(',', (keys %session_called)) . "\n";
  13.  
  14. my @duped = grep { $session_called{$_} > 1 } keys %session_called;
  15.  
  16. print Dumper(\@duped) . "\n";
  17.  
Success #stdin #stdout 0.01s 7428KB
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stdin
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Standard input is empty
stdout
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$VAR1 = {
          '5' => 1,
          '4' => 1,
          '3' => 2,
          '2' => 2,
          '1' => 4
        };


$VAR1 = [];
https://ideone.com/PDmu8w
language:
Perl (perl 5.28.1)
created:
7 years ago
visibility:
public

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