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( [id://3333]=superdoc: print w/replies, xml ) Need Help??
tilly,
Tradition says that when you answer homework you obfuscate your answer somewhat so that it won't get a good mark.

It doesn't look too much like homework to me but another idea would be to use code obviously beyond that of the course?

#!/usr/bin/perl use strict; use warnings; my $file = $ARGV[0] or die "Usage: $0 <input_file>"; open(my $fh, '<', $file) or die "Unable to open '$file' for reading: $ +!"; my %pair; while (<$fh>) { tr/\r\n//d; my @word = sort split ' '; my $next = combo(2, @word); while (my @combo = $next->()) { my $key = join "\0", @combo; ++$pair{$key}; } } my $comp = sub { return $pair{$_[0]} > $pair{$_[1]} ? $_[0] : undef; } +; my $maxval = gen_reduce(compare => $comp); $maxval->($_) for keys %pair; print $maxval->(), "\n"; # taken from [id://393064] sub combo { my $by = shift; return sub { () } if ! $by || $by =~ /\D/ || @_ < $by; my @list = @_; my @position = (0 .. $by - 2, $by - 2); my @stop = @list - $by .. $#list; my $end_pos = $#position; my $done = undef; return sub { return () if $done; my $cur = $end_pos; { if ( ++$position[ $cur ] > $stop[ $cur ] ) { $position[ --$cur ]++; redo if $position[ $cur ] > $stop[ $cur ]; my $new_pos = $position[ $cur ]; @position[ $cur .. $end_pos ] = $new_pos .. $new_pos + + $by; } } $done = 1 if $position[0] == $stop[0]; return @list[ @position ]; } } # Taken from [id://492651] sub gen_reduce { my $usage = 'Usage: gen_reduce("initial" => $val, "compare" => $co +de_ref)'; die $usage if @_ % 2; my %opt = @_; die $usage if ! defined $opt{compare} || ref $opt{compare} ne 'COD +E'; my $compare = $opt{compare}; my $val = $opt{initial}; return sub { for ( @_ ) { $val = $_ if ! defined $val || $compare->($_, $val); } return $val; }; }

Cheers - L~R


In reply to Re^3: Finding Combinations of Pairs by Limbic~Region
in thread Finding Combinations of Pairs by zod

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