- Added solutions by Arne Sommer.

7 files changed, 71 insertions, 0 deletions

diff --git a/challenge-018/arne-sommer/blog.txt b/challenge-018/arne-sommer/blog.txt
new file mode 100644
index 0000000000..ec2b70257a
--- /dev/null
+++ b/challenge-018/arne-sommer/blog.txt
@@ -0,0 +1 @@
+https://perl6.eu/substring-queues.html
diff --git a/challenge-018/arne-sommer/perl6/ch-1.p6 b/challenge-018/arne-sommer/perl6/ch-1.p6
new file mode 100755
index 0000000000..2d4e7b0b5f
--- /dev/null
+++ b/challenge-018/arne-sommer/perl6/ch-1.p6
@@ -0,0 +1,25 @@
+#! /usr/bin/env perl6
+
+sub MAIN (*@strings where @strings.elems >= 2)
+{
+  my %common = substrings( @strings.shift );
+
+  %common = %common ∩ substrings($_) for @strings;
+
+  .say for %common.keys.grep({ .chars == %common.keys>>.chars.max });
+}
+
+
+sub substrings ($string)
+{
+  my %substrings;
+  
+  for ^$string.chars -> $i
+  {
+    for 1 .. $string.chars - $i -> $j
+    {
+      %substrings{ $string.substr($i, $j) } = True;
+    }
+  }
+  return %substrings;
+}
diff --git a/challenge-018/arne-sommer/perl6/ch-2.p6 b/challenge-018/arne-sommer/perl6/ch-2.p6
new file mode 100755
index 0000000000..7237e4e562
--- /dev/null
+++ b/challenge-018/arne-sommer/perl6/ch-2.p6
@@ -0,0 +1,14 @@
+#! /usr/bin/env perl6
+
+use lib "lib";
+
+use PriorityQueue;
+
+my $PQ = PriorityQueue.new;
+
+$PQ.insert_with_priority("AA$_", (^99).pick) for ^10;
+
+while ! $PQ.is_empty
+{
+  say $PQ.pull_highest_priority_element;
+}
\ No newline at end of file
diff --git a/challenge-018/arne-sommer/perl6/lib/.precomp/.lock b/challenge-018/arne-sommer/perl6/lib/.precomp/.lock
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/challenge-018/arne-sommer/perl6/lib/.precomp/.lock
diff --git a/challenge-018/arne-sommer/perl6/lib/.precomp/B834E114E7A64AF8236503A5AE1E84F9F37C8B47/03/03D0BC625DDEC3BE511B7A604CF03963963B5CBF b/challenge-018/arne-sommer/perl6/lib/.precomp/B834E114E7A64AF8236503A5AE1E84F9F37C8B47/03/03D0BC625DDEC3BE511B7A604CF03963963B5CBF
new file mode 100644
index 0000000000..ae1304a28b
--- /dev/null
+++ b/challenge-018/arne-sommer/perl6/lib/.precomp/B834E114E7A64AF8236503A5AE1E84F9F37C8B47/03/03D0BC625DDEC3BE511B7A604CF03963963B5CBF
diff --git a/challenge-018/arne-sommer/perl6/lib/.precomp/B834E114E7A64AF8236503A5AE1E84F9F37C8B47/03/03D0BC625DDEC3BE511B7A604CF03963963B5CBF.repo-id b/challenge-018/arne-sommer/perl6/lib/.precomp/B834E114E7A64AF8236503A5AE1E84F9F37C8B47/03/03D0BC625DDEC3BE511B7A604CF03963963B5CBF.repo-id
new file mode 100644
index 0000000000..52cb87c55b
--- /dev/null
+++ b/challenge-018/arne-sommer/perl6/lib/.precomp/B834E114E7A64AF8236503A5AE1E84F9F37C8B47/03/03D0BC625DDEC3BE511B7A604CF03963963B5CBF.repo-id
@@ -0,0 +1 @@
+DAADAA97D202102F50C02F99B89E28CFC6A3CFFF
\ No newline at end of file
diff --git a/challenge-018/arne-sommer/perl6/lib/PriorityQueue.pm6 b/challenge-018/arne-sommer/perl6/lib/PriorityQueue.pm6
new file mode 100644
index 0000000000..9d2421eda9
--- /dev/null
+++ b/challenge-018/arne-sommer/perl6/lib/PriorityQueue.pm6
@@ -0,0 +1,30 @@
+use v6;
+
+unit class PriorityQueue;
+
+has %!queue;
+
+method is_empty
+{
+  return ! %!queue.elems;
+}
+
+method insert_with_priority ($payload, Int $priority)
+{
+  say ":: $payload ($priority)";
+
+  %!queue{$priority}.push: $payload;
+}
+
+method pull_highest_priority_element
+{
+  my $priority = %!queue.keys.max;
+
+  # say "Q: $priority -> " ~ @(%!queue{$priority});
+
+  my $element = @(%!queue{$priority}).shift;
+
+  %!queue{$priority}:delete unless @(%!queue{$priority}).elems;
+
+  return $element;
+}