From 3c38fdb2e978981d7695cfbdef6c3baadeddccc1 Mon Sep 17 00:00:00 2001
From: arnesom <arne@bbop.org>
Date: Sun, 9 Jul 2023 17:51:24 +0200
Subject: Arne Sommer

---
 challenge-224/arne-sommer/blog.txt             |  1 +
 challenge-224/arne-sommer/raku/additive-digits | 25 ++++++++++++
 challenge-224/arne-sommer/raku/additive-number | 54 ++++++++++++++++++++++++++
 challenge-224/arne-sommer/raku/ch-1.raku       |  7 ++++
 challenge-224/arne-sommer/raku/ch-2.raku       | 54 ++++++++++++++++++++++++++
 challenge-224/arne-sommer/raku/special-notes   |  7 ++++
 6 files changed, 148 insertions(+)
 create mode 100644 challenge-224/arne-sommer/blog.txt
 create mode 100755 challenge-224/arne-sommer/raku/additive-digits
 create mode 100755 challenge-224/arne-sommer/raku/additive-number
 create mode 100755 challenge-224/arne-sommer/raku/ch-1.raku
 create mode 100755 challenge-224/arne-sommer/raku/ch-2.raku
 create mode 100755 challenge-224/arne-sommer/raku/special-notes

diff --git a/challenge-224/arne-sommer/blog.txt b/challenge-224/arne-sommer/blog.txt
new file mode 100644
index 0000000000..36a4add302
--- /dev/null
+++ b/challenge-224/arne-sommer/blog.txt
@@ -0,0 +1 @@
+https://raku-musings.com/numbered-notes.html
diff --git a/challenge-224/arne-sommer/raku/additive-digits b/challenge-224/arne-sommer/raku/additive-digits
new file mode 100755
index 0000000000..d6248cc121
--- /dev/null
+++ b/challenge-224/arne-sommer/raku/additive-digits
@@ -0,0 +1,25 @@
+#! /usr/bin/env raku
+
+unit sub MAIN ($string where $string.chars > 2 && $string ~~ /^<[0..9]>*$/);
+
+say is-additive($string) ?? 'true' !! 'false';
+
+sub is-additive ($string where $string.chars > 2 && $string ~~ /^<[0..9]>*$/)
+{
+  my @digits = $string.comb;
+
+  my $first  = @digits.shift;
+  my $second = @digits.shift;
+
+  while (@digits.elems)
+  {
+    my $third = @digits.shift;
+
+    return False unless $first + $second == $third;
+
+    $first = $second;
+    $second = $third;
+  }
+
+  return True;
+}
diff --git a/challenge-224/arne-sommer/raku/additive-number b/challenge-224/arne-sommer/raku/additive-number
new file mode 100755
index 0000000000..d1bb6e267d
--- /dev/null
+++ b/challenge-224/arne-sommer/raku/additive-number
@@ -0,0 +1,54 @@
+#! /usr/bin/env raku
+
+unit sub MAIN ($string where $string.chars > 2 && $string ~~ /^<[0..9]>*$/,
+  :v(:$verbose));
+
+my $bitmap-length = $string.chars -1;
+
+for 0 .. Inf -> $i
+{
+  my $binary = $i.base(2);
+
+  last if $binary.chars > $bitmap-length;
+
+  my $bitmap  = $binary.fmt('%0' ~ $bitmap-length ~ 'd');
+  my $bitmap2 = $bitmap;
+
+  $bitmap ~~ tr/01/ |/;
+
+  my @bitmap = $bitmap.comb;
+  my $new    = (roundrobin($string.comb, @bitmap)).flat.join;
+  $new ~~ s:g/\s//;
+
+  my @array = $new.split("|");
+
+  say ":: $string -> $bitmap2 -> '$bitmap' -> $new" if $verbose;
+
+  next unless @array.elems >= 3;
+
+  if is-additive(@array)
+  {
+    say 'true';
+    exit;
+  }
+}
+
+say 'false';
+
+sub is-additive (@array)
+{
+  my $first  = @array.shift;
+  my $second = @array.shift;
+
+  while (@array.elems)
+  {
+    my $third = @array.shift;
+
+    return False unless $first + $second == $third;
+
+    $first = $second;
+    $second = $third;
+  }
+
+  return True;
+}
diff --git a/challenge-224/arne-sommer/raku/ch-1.raku b/challenge-224/arne-sommer/raku/ch-1.raku
new file mode 100755
index 0000000000..06f2881268
--- /dev/null
+++ b/challenge-224/arne-sommer/raku/ch-1.raku
@@ -0,0 +1,7 @@
+#! /usr/bin/env raku
+
+unit sub MAIN ($source, $target);
+
+say $target.comb.Bag (<=) $source.comb.Bag
+  ?? 'true'
+  !! 'false';
diff --git a/challenge-224/arne-sommer/raku/ch-2.raku b/challenge-224/arne-sommer/raku/ch-2.raku
new file mode 100755
index 0000000000..d1bb6e267d
--- /dev/null
+++ b/challenge-224/arne-sommer/raku/ch-2.raku
@@ -0,0 +1,54 @@
+#! /usr/bin/env raku
+
+unit sub MAIN ($string where $string.chars > 2 && $string ~~ /^<[0..9]>*$/,
+  :v(:$verbose));
+
+my $bitmap-length = $string.chars -1;
+
+for 0 .. Inf -> $i
+{
+  my $binary = $i.base(2);
+
+  last if $binary.chars > $bitmap-length;
+
+  my $bitmap  = $binary.fmt('%0' ~ $bitmap-length ~ 'd');
+  my $bitmap2 = $bitmap;
+
+  $bitmap ~~ tr/01/ |/;
+
+  my @bitmap = $bitmap.comb;
+  my $new    = (roundrobin($string.comb, @bitmap)).flat.join;
+  $new ~~ s:g/\s//;
+
+  my @array = $new.split("|");
+
+  say ":: $string -> $bitmap2 -> '$bitmap' -> $new" if $verbose;
+
+  next unless @array.elems >= 3;
+
+  if is-additive(@array)
+  {
+    say 'true';
+    exit;
+  }
+}
+
+say 'false';
+
+sub is-additive (@array)
+{
+  my $first  = @array.shift;
+  my $second = @array.shift;
+
+  while (@array.elems)
+  {
+    my $third = @array.shift;
+
+    return False unless $first + $second == $third;
+
+    $first = $second;
+    $second = $third;
+  }
+
+  return True;
+}
diff --git a/challenge-224/arne-sommer/raku/special-notes b/challenge-224/arne-sommer/raku/special-notes
new file mode 100755
index 0000000000..06f2881268
--- /dev/null
+++ b/challenge-224/arne-sommer/raku/special-notes
@@ -0,0 +1,7 @@
+#! /usr/bin/env raku
+
+unit sub MAIN ($source, $target);
+
+say $target.comb.Bag (<=) $source.comb.Bag
+  ?? 'true'
+  !! 'false';
-- 
cgit