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My idea was:
  • For each word, keep track of what line it appears on
  • For each line, iterate over pairs of words (notice I created my own combination iterator)
  • For each each pair, get the intersection of lines
  • If the intersection was more than 1 line, lookup the lines and print them
#!/usr/bin/perl use strict; use warnings; my (%word, %seen); chomp ( my @line = <DATA> ); for my $index ( 0 .. $#line ) { $word{ $_ }{ $index } = undef for split /_/ , $line[ $index ]; } for ( @line ) { my $iter = by_two( $_ ); while ( my @comb = $iter->() ) { my @matches = map { exists $word{ $comb[ 0 ] }{ $_ } ? $_ : () + } keys %{ $word{ $comb[ 1 ] } } ; next if @matches < 2; my $output = join ' and ' , map { $line[ $_ ] } sort { $a <=> +$b } @matches; next if $seen{ $output }++; print "$output\n"; } } sub by_two { my @list = split /_/ , shift; return sub { () } if @list < 2; my ($start, $stop, $pos, $done) = (0, $#list, 0, undef); return sub { return () if $done; $pos++; if ( $pos > $stop ) { $start++; $pos = $start + 1; } $done = 1 if $start == $stop - 1; return $list[ $start ], $list[ $pos ]; } } __DATA__ one_two one_three_two three_one one_four four_three_one
You will notice I have 3 lines of output instead of 5. That is because instead of breaking 3 matches into pairs, I put all 3 on the same line. If you wanted to force the pair issue you could do so using the by_two iterator routine. Finally, it likely could be made more efficient - but hey, I am on a coding hiatus ATM.

Cheers - L~R

In reply to Re: nested combinations: algorithm advice? by Limbic~Region
in thread nested combinations: algorithm advice? by revdiablo

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