Re: Puzzle Regex: Letter Frequency Arithmetic Sequence

Not sure about regexes, but counting frequencies means hashes.

#!/usr/bin/perl
use warnings;
use strict;
use feature qw{ say };

my $dict = '/var/lib/dict/words';  # YMMV

sub each_char_has_different_freq {
    my ($r, $f) = @_;
    keys %$r == keys %$f
}

sub frequencies_form_a_sequence {
    my ($r) = @_;
    keys %$r == grep $r->{$_}, 1 .. keys %$r
}

my @linenlessnesses;
open my $IN, '<', $dict or die $!;
while (<$IN>) {
    chomp;
    next if /\W/;

    my %freq;
    $freq{$_}++ for split //;

    my %r = reverse %freq;
    push @linenlessnesses, $_
        if each_char_has_different_freq(\%r, \%freq)
        && frequencies_form_a_sequence(\%r);
}
say for sort { length $a <=> length $b } @linenlessnesses;
[download]

Interesting output (the longest words) on my machine:

deadheaded
evennesses
keennesses
peppertree
rememberer
restresses
sanenesses
sereneness
sleeveless
sussararas
susurruses
[download]

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,
[download]

Comment on Re: Puzzle Regex: Letter Frequency Arithmetic Sequence Select or Download Code

Replies are listed 'Best First'.
Re^2: Puzzle Regex: Letter Frequency Arithmetic Sequence by tybalt89 (Monsignor) on Oct 17, 2017 at 18:22 UTC
"counting frequencies means hashes" - not always :) `#!/usr/bin/perl # http://perlmonks.org/?node_id=1201500 use strict; use warnings; my $file = '/usr/share/dict/words'; # YMMV open my $fh, '<', $file or die "$! opening $file"; while(<$fh>) { /^[a-z]{6,}$/i or next; my $word = $_; my @counts; $counts[ s/$&//gi ] .= $& while s/.//; grep(!$_ \|\| /../, @counts) or print $word; }` [download]	[reply] [d/l]
Re^2: Puzzle Regex: Letter Frequency Arithmetic Sequence by vagabonding electron (Curate) on Oct 24, 2017 at 14:16 UTC
I played a lot with your solution to understand it well, so first of all - thank you, choroba. Just my two cents: your function `frequencies_form_a_sequence` assumes that the frequencies start with one. The words with letter sequencies 2,3,4 etc. will not be selected then. Should it not be in the following form (`min`, `max` and `all` are from List::Util and List::MoreUtils): `sub frequencies_form_a_sequence { my ($r) = @_; my $min = min keys %$r; return 0 if $min == 1; # Just for test. my $max = max keys %$r; return 0 if $min == $max; # Probably not a sequence. my $bool = all { defined $r->{$_} } $min .. $max; }` [download] I find the following words then (cannot pretend to know what they mean though :) ): `addda ajaja alala anana arara cocco essee esses igigi nanna pappa peepe reree susus taata tatta ululu xxiii deedeed sasararas sassarara` [download]	[reply] [d/l] [select]
Re^3: Puzzle Regex: Letter Frequency Arithmetic Sequence by choroba (Cardinal) on Oct 24, 2017 at 17:01 UTC
Why not, before the update, the challenge wasn't exactly specified, so I understood it as 1 .. n. I'd just use exists instead of defined in the `all` block. ($q=q:Sq=~/;[c](.)(.)/;chr(-\|\|-\|5+lengthSq)`"S\|oS2"`map{chr \|+ord }map{substrSq`S_+\|`\|}3E\|-\|`7**2-3:)=~y+S\|`+$1,++print+eval$q,q,a, [download]	[reply] [d/l] [select]