Dear Masters,
Given the following array: 
    my @source = (1, 2, 3,  4);

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and input pair 
       my @pair  = (1,2);   
       my @pair2 = (2,3);  
       my @pair3 = (1,3);
       my @pair4 = (2,4);

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We would like to find keys in `@source` where the values is smaller than members of any given pairs. So the desired output for each of above pairs are: 
    @pair -> []
    @pair2 -> [1]
    @pair3 -> [2]
    @pair4 -> [1,3]

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What's the right algorithm to do that. The following is my code but fail: 
    sub get_output {
         my ($source,$pair) = @_;
    
      my @output = ();
      my %done = ();
      foreach my $pr (@{$pair}){
         foreach my $sc (@{$source}){
                 next if ($pr <= $kn || $done{$sc});
                 push @output,$sc;  
                 $done{$sc} = 1;
          
         }
      }
    
      use Data::Dumper;
      print Dumper \@output;
      return @output;
    }

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---
neversaint and everlastingly indebted.......

In reply to Searching for the remaining smaller values in an array by neversaint

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