7 files changed, 162 insertions, 52 deletions
diff --git a/challenge-053/ryan-thompson/README.md b/challenge-053/ryan-thompson/README.md
index e61bf17dfd..f0cab5ade3 100644
--- a/challenge-053/ryan-thompson/README.md
+++ b/challenge-053/ryan-thompson/README.md
@@ -1,66 +1,19 @@
 # Ryan Thompson
 
-## Week 052 Solutions
+## Week 053 Solutions
 
-### Task 1 › Stepping Numbers
+### Task 1 › Rotate Matrix
 
  * [Perl](perl/ch-1.pl)
  * [Raku](raku/ch-1.p6)
 
-### Task 2 › Lucky Winner
+### Task 2 › Vowel Strings
 
  * [Perl](perl/ch-2.pl)
  * [Raku](raku/ch-2.p6)
 
 ## Blogs
 
- * [Week 052 › Stepping Numbers](http://ry.ca/2020/03/stepping-numbers/)
- * [Week 052 › Lucky Winner](http://ry.ca/2020/03/lucky-winner/)
+ * [Week 052 › Rotate Matrix](http://ry.ca/2020/03/matrix-rotation/)
+ * [Week 052 › Vowel Strings](http://ry.ca/2020/03/vowel-strings/)
 
-***
-
-## Documentation for `perl/ch-2.pl`
-
-
-# NAME
-
-ch-2.pl - Lucky Winner Simulator 9000
-
-# SYNOPSIS
-
-```
-ch-2.pl [options] [algorithm1 algorithm2 ...]
-ch-2.pl --human=<cpu_algorithm>
-ch-2.pl --help
-```
-
-# OPTIONS
-
-```
---count=<iter>     Play <iter> games                   Default: 1000
---coins=<N>        Every game uses <N> coins           Default: 8
---maxcoin=<N>      Maximum coin value                  Default: 200
---help             Full help page
---human=<cpu_alg>  Human vs CPU, CPU uses <cpu_alg>
---seed=<N>         Use specific random number seed (integer)
---verbose          Enable extra output
---noverbose        Disable extra output
-```
-
-# ALGORITHMS
-
-- `human` › Human input. Only available with `--human` option.
-
-- `bozo` › Real stupid algorithm; chooses left or right randomly.
-
-- `worst` › Somehow even stupider. Always picks lowest option.
-
-- `greedy` › Greedy algorithm. Always picks highest option, but doesn't look
-  ahead.
-
-- `ahead1`, `ahead3`, `ahead5` › Looks ahead **1**, **3**, or **5** turns, and
-  picks the option that maximizes (**my\_score** - **their\_score**)
-
-# AUTHOR
-
-Ryan Thompson <rjt@cpan.org>
diff --git a/challenge-053/ryan-thompson/blog.txt b/challenge-053/ryan-thompson/blog.txt
new file mode 100644
index 0000000000..dbb3e30892
--- /dev/null
+++ b/challenge-053/ryan-thompson/blog.txt
@@ -0,0 +1 @@
+http://www.ry.ca/2020/03/matrix-rotation/
diff --git a/challenge-053/ryan-thompson/blog1.txt b/challenge-053/ryan-thompson/blog1.txt
new file mode 100644
index 0000000000..a7c53d6238
--- /dev/null
+++ b/challenge-053/ryan-thompson/blog1.txt
@@ -0,0 +1 @@
+http://www.ry.ca/2020/03/vowel-strings/
diff --git a/challenge-053/ryan-thompson/perl/ch-1.pl b/challenge-053/ryan-thompson/perl/ch-1.pl
new file mode 100644
index 0000000000..b1656084d8
--- /dev/null
+++ b/challenge-053/ryan-thompson/perl/ch-1.pl
@@ -0,0 +1,48 @@
+#!/usr/bin/env perl
+#
+# ch-1.pl - Rotate matrix
+#
+# 2020 Ryan Thompson <rjt@cpan.org>
+
+use 5.010;
+use warnings;
+use strict;
+no warnings 'uninitialized';
+
+# Rotate a matrix clockwise
+sub rotate90_cw {
+    my @A = reverse @{$_[0]};
+    my @T;
+    for my $x (0..$#A) {
+        $T[$_][$x] = $A[$x][$_] for 0..$#{$A[0]};
+    }
+    \@T;
+}
+
+# Convenience
+sub rotate180    { rotate90_cw( rotate90_cw (@_) ) }
+sub rotate_ccw   { rotate90_cw( rotate180(   @_) ) }
+
+#
+# Tests
+#
+use Test::More;
+
+# 3x3
+is_deeply rotate90_cw ( [[1,2,3],[4,5,6],[7,8,9]]), [[7,4,1],[8,5,2],[9,6,3]];
+is_deeply rotate180(    [[1,2,3],[4,5,6],[7,8,9]]), [[9,8,7],[6,5,4],[3,2,1]];
+is_deeply rotate_ccw(   [[1,2,3],[4,5,6],[7,8,9]]), [[3,6,9],[2,5,8],[1,4,7]];
+
+# MxN
+is_deeply rotate90_cw ( [[1,2],[3,4],[5,6]]), [[5,3,1],[6,4,2]];
+is_deeply rotate180(    [[1,2],[3,4],[5,6]]), [[6,5],[4,3],[2,1]];
+
+# 1xN, Nx1
+is_deeply rotate90_cw(  [[1,2,3]]),     [[1],[2],[3]];
+is_deeply rotate90_cw(  [[1],[2],[3]]), [[3,2,1]];
+
+# Non-numeric, because why not
+is_deeply rotate90_cw ( [['a','b','c'],  ['d','e','f']] ), 
+                        [['d','a'],['e','b'],['f','c']];
+
+done_testing;
diff --git a/challenge-053/ryan-thompson/perl/ch-2.pl b/challenge-053/ryan-thompson/perl/ch-2.pl
new file mode 100644
index 0000000000..081f3895db
--- /dev/null
+++ b/challenge-053/ryan-thompson/perl/ch-2.pl
@@ -0,0 +1,43 @@
+#!/usr/bin/env perl
+#
+# ch-2.pl - Vowel strings
+#
+# Ryan Thompson <rjt@cpan.org>
+
+use 5.010;
+use warnings;
+use strict;
+
+# Follow rules. Basically graph edges.
+my %edges = ( a => ['i','e'],  e => ['i'],    i => ['u','o','e','a'],
+              o => ['u','a'],  u => ['e','o'] );
+
+# Builds vowel strings using BFS with queue
+sub vowel_string {
+    my ($len) = @_;
+    my @queue = sort keys %edges; # Pre-load queue
+
+    my @vstrs;
+    while (my $str = shift @queue) {
+        push @vstrs, $str    and edges if $len <= length $str;
+        push @queue, $str.$_ for @{$edges{ substr $str, -1 }}
+    }
+    @vstrs;
+}
+
+# Iterator version
+sub vowel_iter {
+    my ($len) = @_;
+    my @queue = sort keys %edges;
+    sub {
+        while (my $str = shift @queue) {
+            return $str if $len <= length $str;
+            push @queue, $str.$_ for @{$edges{ substr $str, -1 }}
+        }
+    }
+}
+
+say for vowel_string(6);
+
+my $it = vowel_iter(3);
+say while $_ = $it->();
diff --git a/challenge-053/ryan-thompson/raku/ch-1.p6 b/challenge-053/ryan-thompson/raku/ch-1.p6
new file mode 100644
index 0000000000..746c7f032d
--- /dev/null
+++ b/challenge-053/ryan-thompson/raku/ch-1.p6
@@ -0,0 +1,39 @@
+#!/usr/bin/env perl6
+
+# skeleton.p6 - Rotate Matrix
+#
+# Ryan Thompson <rjt@cpan.org>
+
+sub transpose(@A) { [Z] @A }
+
+multi sub rotate-cw(@A) { [Z] @A.reverse }
+multi sub rotate-cw(@A where !*[0].isa("List")) { @A.map: { [$_] } }
+
+sub rotate180(@A)    { rotate-cw( rotate-cw(@A) ) }
+sub rotate-ccw(@A)   { rotate180( rotate-cw(@A) ) }
+
+
+#
+# Tests
+# 
+
+use Test;
+
+# Matrix transposition
+is-deeply transpose((1,2,3; 4,5,6; 7,8,9)), (1,4,7; 2,5,8; 3,6,9);
+
+# Rotation (mirrored transpose)
+is-deeply rotate-cw( (1,2,3; 4,5,6; 7,8,9)), (7,4,1; 8,5,2; 9,6,3);
+is-deeply rotate180((1,2,3; 4,5,6; 7,8,9)), (9,8,7; 6,5,4; 3,2,1);
+is-deeply rotate-ccw((1,2,3; 4,5,6; 7,8,9)), (3,6,9; 2,5,8; 1,4,7);
+
+# MxN
+is-deeply rotate-cw((1,2; 3,4; 5,6)), (5,3,1; 6,4,2);
+is-deeply rotate180((1,2; 3,4; 5,6)), (6,5; 4,3; 2,1);
+
+# 1xN, Nx1
+is-deeply rotate-cw((1,2,3)), ([1],[2],[3]);
+is-deeply rotate-cw([ [1],[2],[3] ]), ((3,2,1),);
+
+# Non-numeric, because why not
+is-deeply rotate-cw(('a','b','c'; 'd','e','f')), ('d','a'; 'e','b'; 'f','c');
diff --git a/challenge-053/ryan-thompson/raku/ch-2.p6 b/challenge-053/ryan-thompson/raku/ch-2.p6
new file mode 100644
index 0000000000..55143f917d
--- /dev/null
+++ b/challenge-053/ryan-thompson/raku/ch-2.p6
@@ -0,0 +1,25 @@
+#!/usr/bin/env perl6
+
+# ch-2.p6 - Vowel Strings
+#
+# Ryan Thompson <rjt@cpan.org>
+
+#| Graph edges. Key = current node, values => reachable nodes
+my %edges = :a<e i>, :e<i>, :i<a e o u>, :o<a u>, :u<o e>;
+
+#| Builds vowel strings using BFS with queue
+sub vowel-string-iter( Int $len where $len > 0 ) {
+    my @queue = %edges.keys.sort;
+    sub {
+        while (my $str = @queue.shift) {
+            return $str if $str.chars ≥ $len;
+            @queue.push: |$str «~« %edges{ $str.substr(*-1) };
+        }
+    }
+}
+
+#| Print all vowel strings for the specified length
+sub MAIN( Int $len where { $len > 0 } = 3 ) {
+    my $it = vowel-string-iter( $len );
+    .say while $_ = $it.();
+}