From 65711d11f0b9f9a44fadf576655066add0926406 Mon Sep 17 00:00:00 2001
From: Arne Sommer <arne@bbop.org>
Date: Fri, 27 Jun 2025 17:57:29 +0200
Subject: Arne Sommer

---
 challenge-327/arne-sommer/blog.txt              |  1 +
 challenge-327/arne-sommer/raku/ch-1.raku        | 17 +++++++++++++++
 challenge-327/arne-sommer/raku/ch-2.raku        | 28 +++++++++++++++++++++++++
 challenge-327/arne-sommer/raku/mad              | 28 +++++++++++++++++++++++++
 challenge-327/arne-sommer/raku/missing-integers | 17 +++++++++++++++
 5 files changed, 91 insertions(+)
 create mode 100644 challenge-327/arne-sommer/blog.txt
 create mode 100755 challenge-327/arne-sommer/raku/ch-1.raku
 create mode 100755 challenge-327/arne-sommer/raku/ch-2.raku
 create mode 100755 challenge-327/arne-sommer/raku/mad
 create mode 100755 challenge-327/arne-sommer/raku/missing-integers

diff --git a/challenge-327/arne-sommer/blog.txt b/challenge-327/arne-sommer/blog.txt
new file mode 100644
index 0000000000..63680a2da1
--- /dev/null
+++ b/challenge-327/arne-sommer/blog.txt
@@ -0,0 +1 @@
+https://raku-musings.com/missing-mad.html
diff --git a/challenge-327/arne-sommer/raku/ch-1.raku b/challenge-327/arne-sommer/raku/ch-1.raku
new file mode 100755
index 0000000000..52a084114f
--- /dev/null
+++ b/challenge-327/arne-sommer/raku/ch-1.raku
@@ -0,0 +1,17 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (*@ints where @ints.elems > 0 && all(@ints) ~~ Int,
+               :v(:$verbose));
+
+my $max = @ints.elems;
+my $set = @ints>>.Int.grep( 0 < * <= $max).Set;
+
+if $verbose
+{
+  say ": Range: 1 .. $max";
+  say ": Matches: { $set.keys.sort.join(", ") }";
+}
+
+my @missing = (1..$max).grep({ ! so $set{$_} });
+
+say "({ @missing.join(", ") })";
diff --git a/challenge-327/arne-sommer/raku/ch-2.raku b/challenge-327/arne-sommer/raku/ch-2.raku
new file mode 100755
index 0000000000..dd15888081
--- /dev/null
+++ b/challenge-327/arne-sommer/raku/ch-2.raku
@@ -0,0 +1,28 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (*@ints where @ints.elems > 0 && all(@ints) ~~ Int
+                 && @ints.elems == @ints.unique.elems,
+               :v(:$verbose));
+
+my @sort = @ints.sort;
+my @diff = (1 .. @sort.end).map({ @sort[$_] - @sort[$_ -1] });
+my $mad  = @diff.min;
+my $set  = @ints>>.Int.Set;
+my @result;
+
+if $verbose
+{
+  say ": Sorted: @sort[]";
+  say ": Diff: @diff[]";
+}
+
+for sort $set.keys -> $k
+{
+  my $is-mad = so $set{$k + $mad};
+
+  @result.push: ($k, $k + $mad) if $is-mad;
+  
+  say ": $k, { $k + $mad } { $is-mad ?? "is MAD" !! "does not exist" }" if $verbose;
+}
+
+say @result.raku;
\ No newline at end of file
diff --git a/challenge-327/arne-sommer/raku/mad b/challenge-327/arne-sommer/raku/mad
new file mode 100755
index 0000000000..dd15888081
--- /dev/null
+++ b/challenge-327/arne-sommer/raku/mad
@@ -0,0 +1,28 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (*@ints where @ints.elems > 0 && all(@ints) ~~ Int
+                 && @ints.elems == @ints.unique.elems,
+               :v(:$verbose));
+
+my @sort = @ints.sort;
+my @diff = (1 .. @sort.end).map({ @sort[$_] - @sort[$_ -1] });
+my $mad  = @diff.min;
+my $set  = @ints>>.Int.Set;
+my @result;
+
+if $verbose
+{
+  say ": Sorted: @sort[]";
+  say ": Diff: @diff[]";
+}
+
+for sort $set.keys -> $k
+{
+  my $is-mad = so $set{$k + $mad};
+
+  @result.push: ($k, $k + $mad) if $is-mad;
+  
+  say ": $k, { $k + $mad } { $is-mad ?? "is MAD" !! "does not exist" }" if $verbose;
+}
+
+say @result.raku;
\ No newline at end of file
diff --git a/challenge-327/arne-sommer/raku/missing-integers b/challenge-327/arne-sommer/raku/missing-integers
new file mode 100755
index 0000000000..52a084114f
--- /dev/null
+++ b/challenge-327/arne-sommer/raku/missing-integers
@@ -0,0 +1,17 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (*@ints where @ints.elems > 0 && all(@ints) ~~ Int,
+               :v(:$verbose));
+
+my $max = @ints.elems;
+my $set = @ints>>.Int.grep( 0 < * <= $max).Set;
+
+if $verbose
+{
+  say ": Range: 1 .. $max";
+  say ": Matches: { $set.keys.sort.join(", ") }";
+}
+
+my @missing = (1..$max).grep({ ! so $set{$_} });
+
+say "({ @missing.join(", ") })";
-- 
cgit