Merge pull request #9290 from andemark/challenge-249

Challenge 249

2 files changed, 34 insertions, 0 deletions

diff --git a/challenge-249/mark-anderson/raku/ch-1.raku b/challenge-249/mark-anderson/raku/ch-1.raku
new file mode 100644
index 0000000000..8adcd9f766
--- /dev/null
+++ b/challenge-249/mark-anderson/raku/ch-1.raku
@@ -0,0 +1,12 @@
+#!/usr/bin/env raku
+use Test;
+
+is-deeply equal-pairs(3,2,3,2,2,2), ((2,2),(2,2),(3,3));
+is-deeply equal-pairs(1,2,3,4),     ();
+
+sub equal-pairs(+@a where * %% 2)
+{
+    my $b = @a.Bag;
+    return () unless all($b.values) %% 2;
+    $b.kxxv.batch(2).sort
+}
diff --git a/challenge-249/mark-anderson/raku/ch-2.raku b/challenge-249/mark-anderson/raku/ch-2.raku
new file mode 100644
index 0000000000..c1d73452a2
--- /dev/null
+++ b/challenge-249/mark-anderson/raku/ch-2.raku
@@ -0,0 +1,22 @@
+#!/usr/bin/env raku
+use Test;
+
+is-deeply DI("IDID"),                 (0,4,1,3,2);
+is-deeply DI("III"),                  (0,1,2,3);
+is-deeply DI("DDI"),                  (3,2,0,1);
+is-deeply DI("DDID"),                 (4,3,0,2,1);
+is-deeply DI("IDDID"),                (0,5,4,1,3,2);
+is-deeply DI("DDD"),                  (3,2,1,0);
+is-deeply DI("IDDIIDIIIDIIDDIDIDDI"), (0,20,19,1,2,18,3,4,5,17,6,7,16,15,8,14,9,13,12,10,11);
+
+sub DI($str)
+{
+    my @a  = flat $str.comb, "I";
+    my %h := { :I(0), :D(@a.end) }
+
+    gather while @a.shift -> $a
+    {
+        take %h{$a}.abs;
+        %h{$a}--
+    }
+}