7 files changed, 177 insertions, 0 deletions
diff --git a/challenge-218/arne-sommer/blog.txt b/challenge-218/arne-sommer/blog.txt
new file mode 100644
index 0000000000..a4d51990ad
--- /dev/null
+++ b/challenge-218/arne-sommer/blog.txt
@@ -0,0 +1 @@
+https://raku-musings.com/scored-product.html
diff --git a/challenge-218/arne-sommer/raku/ch-1.raku b/challenge-218/arne-sommer/raku/ch-1.raku
new file mode 100755
index 0000000000..55b4b66a98
--- /dev/null
+++ b/challenge-218/arne-sommer/raku/ch-1.raku
@@ -0,0 +1,5 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (*@list where @list.elems >= 3 && all(@list) ~~ Int);
+
+say @list.combinations(3)>>.reduce(&infix:<*>).max;
diff --git a/challenge-218/arne-sommer/raku/ch-2.raku b/challenge-218/arne-sommer/raku/ch-2.raku
new file mode 100755
index 0000000000..e1ddeacb8a
--- /dev/null
+++ b/challenge-218/arne-sommer/raku/ch-2.raku
@@ -0,0 +1,67 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (Str $matrix = "0 0 0 1 | 1 0 1 0 | 1 1 0 0", :v(:$verbose));
+
+my @matrix = $matrix.split("|")>>.words>>.Array;
+my @rows   = @matrix>>.elems;
+
+die "Must have at least 1 row" unless @rows.elems >= 1;
+die "The rows must have the same size" unless [==] @rows;
+die "Must contain 0 and 1 only" unless all(@matrix[*;*]) eq any(0,1);
+
+my $cols = @matrix[0].elems;
+
+say ": Matrix: { @matrix.raku } " if $verbose;
+say ": - Size: rows:$rows cols:$cols" if $verbose;
+
+for ^$rows -> $row-id
+{
+  print ": - row $row-id " if $verbose;
+
+  if @matrix[$row-id][0] == 0
+  {
+    say " - swapping" if $verbose;
+    @matrix.&flip-row($row-id);
+    say ": Matrix: { @matrix.raku } " if $verbose;
+  }
+  else
+  {
+    say " - ok" if $verbose;
+  }
+}
+
+for ^$cols -> $col-id
+{
+  my @cols = (^@matrix.elems).map({ @matrix[$_][$col-id] });
+  
+  print ": - col $col-id -> @cols[]" if $verbose;
+
+  if @cols.sum < $cols / 2
+  {
+    say " - swapping" if $verbose;
+    @matrix.&flip-col($col-id);
+    say ": Matrix: { @matrix.raku } " if $verbose;
+  }
+  else
+  {
+    say " - ok" if $verbose;
+  }
+}
+
+say ": Final matrix: { @matrix.raku }" if $verbose;
+
+say @matrix.map({ @$_.join.parse-base(2) }).sum;
+
+sub flip-row(@matrix, UInt $row)
+{
+  @(@matrix[$row]).=map({ $_ == 1 ?? 0 !! 1 } );
+
+  return @matrix;
+}
+
+sub flip-col(@matrix, UInt $col)
+{
+  (^@matrix.elems).map({ @matrix[$_][$col] = + ! + @matrix[$_][$col] });
+
+  return @matrix;
+}
+\ No newline at end of file
diff --git a/challenge-218/arne-sommer/raku/matrix-score b/challenge-218/arne-sommer/raku/matrix-score
new file mode 100755
index 0000000000..e1ddeacb8a
--- /dev/null
+++ b/challenge-218/arne-sommer/raku/matrix-score
@@ -0,0 +1,67 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (Str $matrix = "0 0 0 1 | 1 0 1 0 | 1 1 0 0", :v(:$verbose));
+
+my @matrix = $matrix.split("|")>>.words>>.Array;
+my @rows   = @matrix>>.elems;
+
+die "Must have at least 1 row" unless @rows.elems >= 1;
+die "The rows must have the same size" unless [==] @rows;
+die "Must contain 0 and 1 only" unless all(@matrix[*;*]) eq any(0,1);
+
+my $cols = @matrix[0].elems;
+
+say ": Matrix: { @matrix.raku } " if $verbose;
+say ": - Size: rows:$rows cols:$cols" if $verbose;
+
+for ^$rows -> $row-id
+{
+  print ": - row $row-id " if $verbose;
+
+  if @matrix[$row-id][0] == 0
+  {
+    say " - swapping" if $verbose;
+    @matrix.&flip-row($row-id);
+    say ": Matrix: { @matrix.raku } " if $verbose;
+  }
+  else
+  {
+    say " - ok" if $verbose;
+  }
+}
+
+for ^$cols -> $col-id
+{
+  my @cols = (^@matrix.elems).map({ @matrix[$_][$col-id] });
+  
+  print ": - col $col-id -> @cols[]" if $verbose;
+
+  if @cols.sum < $cols / 2
+  {
+    say " - swapping" if $verbose;
+    @matrix.&flip-col($col-id);
+    say ": Matrix: { @matrix.raku } " if $verbose;
+  }
+  else
+  {
+    say " - ok" if $verbose;
+  }
+}
+
+say ": Final matrix: { @matrix.raku }" if $verbose;
+
+say @matrix.map({ @$_.join.parse-base(2) }).sum;
+
+sub flip-row(@matrix, UInt $row)
+{
+  @(@matrix[$row]).=map({ $_ == 1 ?? 0 !! 1 } );
+
+  return @matrix;
+}
+
+sub flip-col(@matrix, UInt $col)
+{
+  (^@matrix.elems).map({ @matrix[$_][$col] = + ! + @matrix[$_][$col] });
+
+  return @matrix;
+}
+\ No newline at end of file
diff --git a/challenge-218/arne-sommer/raku/maximum-product b/challenge-218/arne-sommer/raku/maximum-product
new file mode 100755
index 0000000000..a8af339369
--- /dev/null
+++ b/challenge-218/arne-sommer/raku/maximum-product
@@ -0,0 +1,27 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (*@list where @list.elems >= 3 && all(@list) ~~ Int,
+               :v(:$verbose));
+
+my $highest = - Inf;
+my @highest;
+
+for @list.combinations(3) -> @candidate
+{
+  my $product = [*] @candidate;
+
+  print ":Candidate { @candidate.join(",") } with product: $product" if $verbose;
+
+  if $product > $highest
+  {
+    $highest = $product;
+    @highest = @candidate;
+    print " - highest" if $verbose;
+  }
+
+  say "";
+}
+
+say ":Highest triple { @highest.join(",") }" if $verbose;
+
+say $highest;
diff --git a/challenge-218/arne-sommer/raku/maximum-product-map b/challenge-218/arne-sommer/raku/maximum-product-map
new file mode 100755
index 0000000000..863fbec451
--- /dev/null
+++ b/challenge-218/arne-sommer/raku/maximum-product-map
@@ -0,0 +1,5 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (*@list where @list.elems >= 3 && all(@list) ~~ Int);
+
+say @list.combinations(3).map({ [*] @_ }).max;
diff --git a/challenge-218/arne-sommer/raku/maximum-product-reduce b/challenge-218/arne-sommer/raku/maximum-product-reduce
new file mode 100755
index 0000000000..55b4b66a98
--- /dev/null
+++ b/challenge-218/arne-sommer/raku/maximum-product-reduce
@@ -0,0 +1,5 @@
+#! /usr/bin/env raku
+
+unit sub MAIN (*@list where @list.elems >= 3 && all(@list) ~~ Int);
+
+say @list.combinations(3)>>.reduce(&infix:<*>).max;