From 746e3bbb14728b954c2ad4985883bae360de7245 Mon Sep 17 00:00:00 2001
From: Simon Proctor <simon.proctor@zpg.co.uk>
Date: Wed, 7 Aug 2019 18:56:36 +0100
Subject: Challenge 20 all done.

---
 challenge-020/simon-proctor/perl6/ch-1.p6 | 14 ++++++++++++
 challenge-020/simon-proctor/perl6/ch-2.p6 | 37 +++++++++++++++++++++++++++++++
 2 files changed, 51 insertions(+)
 create mode 100644 challenge-020/simon-proctor/perl6/ch-1.p6
 create mode 100644 challenge-020/simon-proctor/perl6/ch-2.p6

diff --git a/challenge-020/simon-proctor/perl6/ch-1.p6 b/challenge-020/simon-proctor/perl6/ch-1.p6
new file mode 100644
index 0000000000..b3cc956bd6
--- /dev/null
+++ b/challenge-020/simon-proctor/perl6/ch-1.p6
@@ -0,0 +1,14 @@
+#!/usr/bin/env perl6
+
+use v6;
+
+multi sub MAIN ( Bool :h(:$help) where so * ) {
+    say $*USAGE;
+}
+
+#| Takes a string and outputs it broken into sets of the same character
+multi sub MAIN ( Str $input is copy ) {
+    while my $m = $input ~~ s!^$<match>=((.)$0*)!! {
+        $m<match>.Str.say;
+    }
+}
\ No newline at end of file
diff --git a/challenge-020/simon-proctor/perl6/ch-2.p6 b/challenge-020/simon-proctor/perl6/ch-2.p6
new file mode 100644
index 0000000000..614abab055
--- /dev/null
+++ b/challenge-020/simon-proctor/perl6/ch-2.p6
@@ -0,0 +1,37 @@
+#!/usr/bin/env perl6
+
+use v6;
+
+
+multi sub MAIN ( Bool :h(:$help) where so * ) {
+    say $*USAGE;
+}
+
+#|Given a starting number (default 0) find the first two Amicable numbers following it.
+multi sub MAIN ( Int $start = 0 ) {
+    my $current = $start;
+    my $pair;
+    loop {        
+        $current++;
+        $pair = first-pair( $current );
+        last if $pair;
+    }
+    say "$pair, $current";
+
+}
+
+sub first-pair( Int $number ) {
+    my $num-total = [+] divisors( $number );
+    (1..^$number).first( 
+        {
+            my $sum = [+] divisors( $_ );
+            ($sum == $number && $num-total == $_) 
+        }
+    );
+}
+
+sub divisors( Int $number ) is pure {
+    state @divs;
+    my $mid = $number div 2;
+    @divs[$number] //= (1..$mid).grep( $number %% * ).list;
+}
\ No newline at end of file
-- 
cgit