Here's my stab at it: 
use strict;
use warnings;
use Data::Dumper;

my $sample1 =  ['str1 str2  1',
                'str3 str4  2',
                'str5 str6  3',
                'str7 str8  4',
                'str9 str10 5'];

my $sample2  = ['str1 str2 0',
                'str3 str4 4'];

my $sample3  = ['str1 str2 3',
                'str3 str4 4'];

get_column($sample1);

sub get_column
{
    my  $ar = shift;

    my $all;
    foreach  my $str ( @{$ar}  )
    {
      my @ar = (split " ",$str);
      push @{$all}, [ @ar ];
    }


      my @clean;
      my $diff;

      
      foreach  my $i ( 1..$#{$all}  )
      {
          $diff = abs($all->[$i][2]- $all->[$i-1][2] );
      print "$i\t$diff\n";
          if ( $diff == 1  )
          {
            push @clean, $all->[$i-1][0];
          }
          if ( $diff > 1 )
          {
            push @clean, $all->[$i-1][0], $all->[$i-1][1], $all->[$i][
+0], $all->[$i][1];
           }
      if( $diff == 1 && $i == $#{$all} ){
       push @clean, $all->[$i][0], $all->[$i][1];
    }

      }
          print Dumper \@clean;
    return ;
}

[download]

JamesNC

In reply to Re: Simple Logic Problem with Perl by JamesNC
in thread Simple Logic Problem with Perl by Anonymous Monk

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