From 74dd46f18a725cfe920bfa362fd1ddc3377143c8 Mon Sep 17 00:00:00 2001
From: "Kian-Meng, Ang" <kianmeng@cpan.org>
Date: Sun, 28 Apr 2019 22:35:33 +0800
Subject: Challenge #5 answers and challenge #4 blog link

---
 challenge-004/kian-meng-ang/blog.txt |  1 +
 challenge-005/kian-meng-ang/ch-1.pl  | 40 ++++++++++++++++++++++++++++++++
 challenge-005/kian-meng-ang/ch-2.pl  | 44 ++++++++++++++++++++++++++++++++++++
 3 files changed, 85 insertions(+)
 create mode 100644 challenge-004/kian-meng-ang/blog.txt
 create mode 100644 challenge-005/kian-meng-ang/ch-1.pl
 create mode 100644 challenge-005/kian-meng-ang/ch-2.pl

diff --git a/challenge-004/kian-meng-ang/blog.txt b/challenge-004/kian-meng-ang/blog.txt
new file mode 100644
index 0000000000..29829da7b6
--- /dev/null
+++ b/challenge-004/kian-meng-ang/blog.txt
@@ -0,0 +1 @@
+https://www.kianmeng.org/2019/04/perl-weekly-challenge-004-2019-week-16.html
diff --git a/challenge-005/kian-meng-ang/ch-1.pl b/challenge-005/kian-meng-ang/ch-1.pl
new file mode 100644
index 0000000000..7bf4e81372
--- /dev/null
+++ b/challenge-005/kian-meng-ang/ch-1.pl
@@ -0,0 +1,40 @@
+#!/usr/bin/env perl
+
+use 5.010;
+use autodie;
+use strict;
+use warnings;
+use utf8;
+use Carp;
+
+carp 'missing word and dictionary file' if (@ARGV != 2);
+my ($word, $dict) = @ARGV;
+my $word_hash = join '', sort split //, $word;
+my $word_length = length $word_hash;
+my @anagrams;
+
+open my $fh, '<:encoding(UTF-8)', $dict;
+while (my $dword = <$fh>) {
+    chomp $dword;
+    next if (length $dword != $word_length);
+
+    my $dword_hash = join '', sort split //, $dword;
+    next if ($dword_hash ne $word_hash);
+    next if ($dword eq $word);
+
+    push @anagrams, $dword;
+}
+close $fh;
+
+say sprintf 'Word: %s', $word;
+say sprintf 'Anagrams: %s', join q|, |, @anagrams;
+
+1;
+
+__END__
+
+$ perl ch-1.pl elbow /usr/share/dict/words
+Word: elbow
+Anagrams: below, bowel
+
+# vi:et:sw=4 ts=4 ft=perl
diff --git a/challenge-005/kian-meng-ang/ch-2.pl b/challenge-005/kian-meng-ang/ch-2.pl
new file mode 100644
index 0000000000..18e659b925
--- /dev/null
+++ b/challenge-005/kian-meng-ang/ch-2.pl
@@ -0,0 +1,44 @@
+#!/usr/bin/env perl
+
+use 5.010;
+use autodie;
+use strict;
+use warnings;
+use utf8;
+use Carp;
+use List::Util qw(max);
+
+carp 'missing dictionary file' if (@ARGV != 1);
+my ($dict) = @ARGV;
+my %anagram_list;
+
+open my $fh, '<:encoding(UTF-8)', $dict;
+while (my $dword = <$fh>) {
+    chomp $dword;
+
+    my $dword_hash = join '', sort split //, $dword;
+    push @{ $anagram_list{$dword_hash} }, $dword;
+}
+close $fh;
+
+my $max_anagram_count = max(map { scalar @{$_} } values %anagram_list);
+
+foreach my $anagrams (values %anagram_list) {
+    next if (scalar @{$anagrams} != $max_anagram_count);
+    say sprintf 'Total anagrams: %d', scalar @{$anagrams};
+    say sprintf 'Anagrams: %s', join q|, |, @{$anagrams};
+    say q||;
+}
+
+1;
+
+__END__
+
+$ perl ch-2.pl /usr/share/dict/words
+Total anagrams: 7
+Anagrams: carets, caster, caters, crates, reacts, recast, traces
+
+Total anagrams: 7
+Anagrams: pares, parse, pears, rapes, reaps, spare, spear
+
+# vi:et:sw=4 ts=4 ft=perl
-- 
cgit