From ade47cc863d4756c1d13a71435bb429d782a5fe5 Mon Sep 17 00:00:00 2001
From: Roger Bell_West <roger@firedrake.org>
Date: Mon, 23 Mar 2020 11:27:57 +0000
Subject: Solutions for challenge #53.

---
 challenge-053/roger-bell-west/perl5/ch-1.pl | 37 +++++++++++++++++++++++++++++
 challenge-053/roger-bell-west/perl5/ch-2.pl | 31 ++++++++++++++++++++++++
 challenge-053/roger-bell-west/perl6/ch-1.p6 | 34 ++++++++++++++++++++++++++
 challenge-053/roger-bell-west/perl6/ch-2.p6 | 28 ++++++++++++++++++++++
 4 files changed, 130 insertions(+)
 create mode 100755 challenge-053/roger-bell-west/perl5/ch-1.pl
 create mode 100755 challenge-053/roger-bell-west/perl5/ch-2.pl
 create mode 100755 challenge-053/roger-bell-west/perl6/ch-1.p6
 create mode 100755 challenge-053/roger-bell-west/perl6/ch-2.p6

diff --git a/challenge-053/roger-bell-west/perl5/ch-1.pl b/challenge-053/roger-bell-west/perl5/ch-1.pl
new file mode 100755
index 0000000000..b8610926bd
--- /dev/null
+++ b/challenge-053/roger-bell-west/perl5/ch-1.pl
@@ -0,0 +1,37 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+
+my @in=([1,2,3],
+        [4,5,6],
+        [7,8,9],
+          );
+
+my @out=rotate(1,@in);
+
+foreach my $r (@out) {
+  print '[ '.join(', ',@{$r})." ]\n";
+}
+
+sub rotate {
+  my ($rotations,@in)=@_;
+  my $xs=$#in;
+  foreach my $ya (@in) {
+    if ($#{$ya} != $xs) {
+      die "not a square matrix\n";
+    }
+  }
+  my @out=@in;
+  foreach (1..$rotations) {
+    my @im=@out;
+    my @tmp;
+    foreach my $x (0..$xs) {
+      foreach my $y (0..$xs) {
+        $tmp[$y][$xs-$x]=$im[$x][$y];
+      }
+    }
+    @out=@tmp;
+  }
+  return @out;
+}
diff --git a/challenge-053/roger-bell-west/perl5/ch-2.pl b/challenge-053/roger-bell-west/perl5/ch-2.pl
new file mode 100755
index 0000000000..3c3a1a9e10
--- /dev/null
+++ b/challenge-053/roger-bell-west/perl5/ch-2.pl
@@ -0,0 +1,31 @@
+#! /usr/bin/perl
+
+use strict;
+use warnings;
+
+my %tree=(
+  '' => [qw(a e i o u)],
+  a => [qw(e i)],
+  e => [qw(i)],
+  i => [qw(a e o u)],
+  o => [qw(a u)],
+  u => [qw(o e)],
+    );
+
+print map {"$_\n"} generate(2,\%tree);
+
+sub generate {
+  my ($len,$tree)=@_;
+  my @list=('');
+  while (1) {
+    if (length($list[0])==$len) {
+      last;
+    }
+    my $r=shift @list;
+    my $s=substr($r,-1,1) || '';
+    foreach my $extension (@{$tree{$s}}) {
+      push @list,$r.$extension;
+    }
+  }
+  return @list;
+}
diff --git a/challenge-053/roger-bell-west/perl6/ch-1.p6 b/challenge-053/roger-bell-west/perl6/ch-1.p6
new file mode 100755
index 0000000000..72d28167f9
--- /dev/null
+++ b/challenge-053/roger-bell-west/perl6/ch-1.p6
@@ -0,0 +1,34 @@
+#! /usr/bin/perl6
+
+my @in=([1,2,3],
+        [4,5,6],
+        [7,8,9],
+          );
+
+my @out=rotate(1,@in);
+
+for @out -> @r {
+  print '[ ' ~ join(', ',@r) ~ " ]\n";
+}
+
+sub rotate {
+  my ($rotations,@in)=@_;
+  my $xs=@in.end;
+  for @in -> @ya {
+    if (@ya.end != $xs) {
+      die "not a square matrix\n";
+    }
+  }
+  my @out=@in;
+  for 1..$rotations {
+    my @im=@out;
+    my @tmp;
+    for 0..$xs -> $x {
+      for 0..$xs -> $y {
+        @tmp[$y][$xs-$x]=@im[$x][$y];
+      }
+    }
+    @out=@tmp;
+  }
+  return @out;
+}
diff --git a/challenge-053/roger-bell-west/perl6/ch-2.p6 b/challenge-053/roger-bell-west/perl6/ch-2.p6
new file mode 100755
index 0000000000..42b3d24a3d
--- /dev/null
+++ b/challenge-053/roger-bell-west/perl6/ch-2.p6
@@ -0,0 +1,28 @@
+#! /usr/bin/perl6
+
+my %tree=(
+  '' => [<a e i o u>],
+  a => [<e i>],
+  e => [<i>],
+  i => [<a e o u>],
+  o => [<a u>],
+  u => [<o e>],
+    );
+
+print map {"$_\n"}, generate(2,%tree);
+
+sub generate {
+  my ($len,%tree)=@_;
+  my @list=('');
+  while (1) {
+    if (@list[0].chars==$len) {
+      last;
+    }
+    my $r=shift @list;
+    my $s = substr($r,*-1,1) || '';
+    for @(%tree{$s}) -> $extension {
+      push @list,$r ~ $extension;
+    }
+  }
+  return @list;
+}
-- 
cgit