2 files changed, 30 insertions, 0 deletions
diff --git a/challenge-228/mark-anderson/raku/ch-1.raku b/challenge-228/mark-anderson/raku/ch-1.raku
new file mode 100644
index 0000000000..4d961b6d77
--- /dev/null
+++ b/challenge-228/mark-anderson/raku/ch-1.raku
@@ -0,0 +1,12 @@
+#!/usr/bin/env raku
+use Test;
+
+is  unique-sum(<2 1 3 2>),  4;
+is  unique-sum(<1 1 1 1>),  0;
+is  unique-sum(<2 1 3 4>), 10;
+say unique-sum((^1000).roll(1000));
+
+sub unique-sum(*@a)
+{
+    sum do map {.key}, @a.Bag.grep(*.value == 1)
+}
diff --git a/challenge-228/mark-anderson/raku/ch-2.raku b/challenge-228/mark-anderson/raku/ch-2.raku
new file mode 100644
index 0000000000..1c0abef944
--- /dev/null
+++ b/challenge-228/mark-anderson/raku/ch-2.raku
@@ -0,0 +1,18 @@
+#!/usr/bin/env raku
+use Test;
+
+is  empty-array(<3 4 2>),                                                5;
+is  empty-array(<1 2 3>),                                                3;
+is  empty-array(<16 17 8 15 13 11 19 5 12 6 20 2 4 10 3 14 1 7 9 18>), 127;
+say empty-array((^1000).pick(1000));
+
+sub empty-array(*@a)
+{
+    sum do while @a
+    {
+        my $v = @a.antipairs.min.value;
+        @a .= rotate($v);
+        @a.shift;
+        $v.succ
+    }
+}