From 25c3b922e82ddb7e31f6a6e98a0deef047b81182 Mon Sep 17 00:00:00 2001
From: Simon Proctor <simon.proctor@zoopla.co.uk>
Date: Tue, 21 Jul 2020 09:35:28 +0100
Subject: Challenge 2

---
 challenge-070/simon-proctor/raku/ch-2.raku | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)
 create mode 100644 challenge-070/simon-proctor/raku/ch-2.raku

diff --git a/challenge-070/simon-proctor/raku/ch-2.raku b/challenge-070/simon-proctor/raku/ch-2.raku
new file mode 100644
index 0000000000..b32eef2438
--- /dev/null
+++ b/challenge-070/simon-proctor/raku/ch-2.raku
@@ -0,0 +1,18 @@
+#!/usr/bin/env raku
+
+use v6;
+
+#| Generate ther Gray Code of length N
+sub MAIN (
+    Int $N where 2 <= * <= 5 #= Length of Gray code sequence to generate
+){
+    say gray-bins( $N ).map( *.parse-base(2) );
+}
+
+multi sub gray-bins ( 1 ) { [ "0", "1" ] }
+
+multi sub gray-bins ( Int $n ) {
+    my @prev = gray-bins( $n - 1 );
+
+    [ |@prev.map({ "0{$_}" }), |@prev.reverse.map({"1{$_}"}) ];
+}
-- 
cgit