Solution to task 2

1 files changed, 95 insertions, 0 deletions

diff --git a/challenge-307/jo-37/perl/ch-2.pl b/challenge-307/jo-37/perl/ch-2.pl
new file mode 100755
index 0000000000..8826338789
--- /dev/null
+++ b/challenge-307/jo-37/perl/ch-2.pl
@@ -0,0 +1,95 @@
+#!/usr/bin/perl
+
+use v5.26;
+use Test2::V0  '!float';
+use Test2::Tools::Subtest 'subtest_streamed';
+use Test2::Tools::PDL;
+use Getopt::Long;
+use experimental 'signatures';
+use utf8;
+
+use PDL;
+use PDL::Char;
+
+
+### Options and Arguments
+
+my ($tests, $examples, $verbose);
+GetOptions(
+    'examples!' => \$examples,
+    'tests!'    => \$tests,
+    'verbose!'  => \$verbose,
+) or usage();
+
+run_tests($examples, $tests);	# tests do not return
+
+usage() unless @ARGV;
+
+sub usage {
+    die <<~EOS;
+    $0 - Find anagrams
+
+    usage: $0 [-examples] [-tests] [W...]
+
+    -examples
+        run the examples from the challenge
+     
+    -tests
+        run some tests
+
+    W...
+        list of words
+
+    EOS
+}
+
+
+### Input and Output
+
+say count_anagrams(@ARGV);
+
+
+### Implementation
+#
+# For details see:
+# https://github.sommrey.de/the-bears-den/2025/02/07/ch-307.html#task-2
+
+sub count_anagrams {
+    1 + PDL::Char->new(map fc, @_)->qsort->enumvecg->at(-1);
+}
+
+
+### Examples and Tests
+
+sub run_tests ($examples, $tests) {
+    return unless $examples || $tests;
+
+    state sub run_example ($args, $expected, $name) {
+        my $result = count_anagrams(@$args);
+        is $result, $expected,
+            "$name: (@$args) -> $expected";
+    }
+
+    plan 2;
+
+    $examples ? subtest_streamed(examples => sub {
+        my @examples = (
+            [["acca", "dog", "god", "perl", "repl"], 3, 'example 1'],
+            [["abba", "baba", "aabb", "ab", "ab"], 2, 'example 2'],
+        );
+        plan scalar @examples;
+        for (@examples) {
+            run_example @$_;
+        }
+    }) : pass 'skip examples';
+
+    $tests ? subtest_streamed(tests => sub {
+        plan 3;
+        is count_anagrams(qw(ab bc ba)), 3, 'non-adjacent';
+        is count_anagrams(qw(Ruffle Flufre)), 1,
+            'fold case, ligature ffl';
+        is count_anagrams(qw(ab bc cd dc)), 3, 'last group';
+    }) : pass 'skip tests';
+
+    exit;
+}