- Added solutions by Laurent Rosenfeld.

16 files changed, 1344 insertions, 1195 deletions

diff --git a/challenge-053/laurent-rosenfeld/blog.txt b/challenge-053/laurent-rosenfeld/blog.txt
new file mode 100644
index 0000000000..679a883236
--- /dev/null
+++ b/challenge-053/laurent-rosenfeld/blog.txt
@@ -0,0 +1 @@
+http://blogs.perl.org/users/laurent_r/2020/03/perl-weekly-challenge-53-rotate-matrix-and-vowel-strings.html
diff --git a/challenge-053/laurent-rosenfeld/perl/ch-1.pl b/challenge-053/laurent-rosenfeld/perl/ch-1.pl
new file mode 100644
index 0000000000..607322cf06
--- /dev/null
+++ b/challenge-053/laurent-rosenfeld/perl/ch-1.pl
@@ -0,0 +1,39 @@
+use strict;
+use warnings;
+use feature "say";
+
+sub display_matrix {
+    my $matrix = shift;
+    for my $row (@$matrix) {
+        say "[", join(", ", @$row), "]";
+    }
+}
+
+sub rotate_90 {
+    my $input = shift;
+    my @output;
+    for my $row (0 .. $#$input) {
+        for my $col (0 .. $#{@$input[$row]}) {
+            $output[$col][$#{@$input[$row]} - $row] = $input->[$row][$col];
+        }
+    }
+  return \@output;
+}
+sub rotate_180 {rotate_90 rotate_90 @_}
+sub rotate_270 {rotate_90 rotate_180 @_}
+
+my $matrix_ref = [
+    [1, 2 ,3],
+    [4, 5, 6],
+    [7, 8, 9],
+];
+say "Initial matrix:";
+display_matrix($matrix_ref);
+say "\nMatrix rotated 90°";
+display_matrix rotate_90 $matrix_ref;
+say "\nMatrix rotated 180°";
+display_matrix rotate_180 $matrix_ref;
+say "\nMatrix rotated 270°";
+display_matrix rotate_270 $matrix_ref;
+say "\nRotate 360 (sanity check, should be the initial matrix)";
+display_matrix rotate_270 rotate_90 $matrix_ref;
diff --git a/challenge-053/laurent-rosenfeld/perl/ch-2.pl b/challenge-053/laurent-rosenfeld/perl/ch-2.pl
new file mode 100644
index 0000000000..711cdc961c
--- /dev/null
+++ b/challenge-053/laurent-rosenfeld/perl/ch-2.pl
@@ -0,0 +1,28 @@
+use strict;
+use warnings;
+use feature "say";
+
+my %successors = (
+    a => ['e', 'i'],
+    e => ['i'],
+    i => [qw /a e o u/],
+    o => ['a', 'u'],
+    u => ['e', 'o']
+);
+my @vowels = sort keys %successors;
+my $error_msg = "Please pass a parameter between 1 and 5.";
+my $str_size = shift or die $error_msg;
+die $error_msg unless $str_size =~ /^[1-5]$/;
+
+for my $start (@vowels) {
+    make_str($str_size -1, $start, $start);
+}
+
+sub make_str {
+    my ($left, $last, $string) = @_;
+    say $string and return unless $left; # Stop the recursion
+    for my $next (@{$successors{$last}}) {
+        my $new_str = $string . $next;
+        make_str($left -1, $next, $new_str);
+    }
+}
diff --git a/challenge-053/laurent-rosenfeld/raku/ch-1.p6 b/challenge-053/laurent-rosenfeld/raku/ch-1.p6
new file mode 100644
index 0000000000..6fe0d6997f
--- /dev/null
+++ b/challenge-053/laurent-rosenfeld/raku/ch-1.p6
@@ -0,0 +1,34 @@
+use v6;
+
+sub display_matrix (@matrix) {
+    for @matrix -> $row {
+        say "[", join(", ", $row), "]";
+    }
+}
+sub rotate_90 (@input) {
+    my @output;
+    for 0 .. @input.end -> $row {
+        for 0 .. @input[$row].end -> $col {
+            @output[$col][@input[$row].end - $row] = @input[$row][$col];
+        }
+    }
+  return @output;
+}
+sub rotate_180 (@matrix) {rotate_90 rotate_90 @matrix}
+sub rotate_270 (@matrix) {rotate_90 rotate_180 @matrix}
+
+my $matrix = (
+    [1, 2 ,3],
+    [4, 5, 6],
+    [7, 8, 9],
+);
+say "Initial matrix:";
+display_matrix($matrix);
+say "\nMatrix rotated 90°";
+display_matrix rotate_90 $matrix;
+say "\nMatrix rotated 180°";
+display_matrix rotate_180 $matrix;
+say "\nMatrix rotated 270°";
+display_matrix rotate_270 $matrix;
+say "\nRotate 360 (sanity check, should be the initial matrix)";
+display_matrix rotate_270 rotate_90 $matrix;
diff --git a/challenge-053/laurent-rosenfeld/raku/ch-2.p6 b/challenge-053/laurent-rosenfeld/raku/ch-2.p6
new file mode 100644
index 0000000000..8a5059e402
--- /dev/null
+++ b/challenge-053/laurent-rosenfeld/raku/ch-2.p6
@@ -0,0 +1,24 @@
+use v6;
+
+my %successors = (
+    'a' => ['e', 'i'],
+    'e' => ['i'],
+    'i' => [qw /a e o u/],
+    'o' => ['a', 'u'],
+    'u' => ['e', 'o']
+);
+my @vowels = sort %successors.keys;
+sub MAIN (UInt $str_size where 1 <= * <= 5) {
+    my $error_msg = "Please pass a parameter between 1 and 5.";
+    die $error_msg unless $str_size ~~ /^<[1..5]>$/;
+    for @vowels -> $start {
+        make_str($str_size -1, $start, $start);
+    }
+}
+sub make_str (UInt $left, Str $last, Str $string) {
+    say $string and return unless $left;
+    for |%successors{$last} -> $next {
+        my $new_str = $string ~ $next;
+        make_str($left -1, $next, $new_str);
+    }
+}
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index 2f3cee2759..aa6bab8cd1 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -1,20 +1,8 @@
 {
-   "chart" : {
-      "type" : "column"
-   },
-   "legend" : {
-      "enabled" : 0
-   },
-   "tooltip" : {
-      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>",
-      "followPointer" : 1,
-      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>"
-   },
-   "title" : {
-      "text" : "Perl Weekly Challenge - 053"
-   },
    "series" : [
       {
+         "name" : "Perl Weekly Challenge - 053",
+         "colorByPoint" : 1,
          "data" : [
             {
                "drilldown" : "Andrezgz",
@@ -22,9 +10,9 @@
                "name" : "Andrezgz"
             },
             {
-               "y" : 3,
+               "drilldown" : "Arne Sommer",
                "name" : "Arne Sommer",
-               "drilldown" : "Arne Sommer"
+               "y" : 3
             },
             {
                "name" : "Athanasius",
@@ -32,9 +20,9 @@
                "drilldown" : "Athanasius"
             },
             {
-               "y" : 1,
+               "drilldown" : "Cheok-Yin Fung",
                "name" : "Cheok-Yin Fung",
-               "drilldown" : "Cheok-Yin Fung"
+               "y" : 1
             },
             {
                "drilldown" : "Dave Cross",
@@ -42,29 +30,34 @@
                "name" : "Dave Cross"
             },
             {
-               "y" : 3,
                "name" : "Dave Jacoby",
+               "y" : 3,
                "drilldown" : "Dave Jacoby"
             },
             {
-               "y" : 2,
                "name" : "E. Choroba",
+               "y" : 2,
                "drilldown" : "E. Choroba"
             },
             {
+               "drilldown" : "Javier Luque",
                "y" : 5,
-               "name" : "Javier Luque",
-               "drilldown" : "Javier Luque"
+               "name" : "Javier Luque"
+            },
+            {
+               "y" : 5,
+               "name" : "Laurent Rosenfeld",
+               "drilldown" : "Laurent Rosenfeld"
             },
             {
                "drilldown" : "Lubos Kolouch",
-               "name" : "Lubos Kolouch",
-               "y" : 2
+               "y" : 2,
+               "name" : "Lubos Kolouch"
             },
             {
                "drilldown" : "Luca Ferrari",
-               "y" : 4,
-               "name" : "Luca Ferrari"
+               "name" : "Luca Ferrari",
+               "y" : 4
             },
             {
                "drilldown" : "Mark Anderson",
@@ -72,9 +65,9 @@
                "name" : "Mark Anderson"
             },
             {
-               "drilldown" : "Markus Holzer",
+               "name" : "Markus Holzer",
                "y" : 3,
-               "name" : "Markus Holzer"
+               "drilldown" : "Markus Holzer"
             },
             {
                "y" : 5,
@@ -82,14 +75,14 @@
                "drilldown" : "Mohammad S Anwar"
             },
             {
+               "drilldown" : "Pete Houston",
                "y" : 1,
-               "name" : "Pete Houston",
-               "drilldown" : "Pete Houston"
+               "name" : "Pete Houston"
             },
             {
-               "drilldown" : "Roger Bell West",
                "y" : 4,
-               "name" : "Roger Bell West"
+               "name" : "Roger Bell West",
+               "drilldown" : "Roger Bell West"
             },
             {
                "drilldown" : "Saif Ahmed",
@@ -97,9 +90,9 @@
                "y" : 2
             },
             {
-               "drilldown" : "Simon Proctor",
+               "name" : "Simon Proctor",
                "y" : 2,
-               "name" : "Simon Proctor"
+               "drilldown" : "Simon Proctor"
             },
             {
                "y" : 2,
@@ -107,55 +100,38 @@
                "drilldown" : "Ulrich Rieke"
             },
             {
+               "drilldown" : "Wanderdoc",
                "y" : 2,
-               "name" : "Wanderdoc",
-               "drilldown" : "Wanderdoc"
+               "name" : "Wanderdoc"
             },
             {
-               "y" : 2,
                "name" : "Yet Ebreo",
+               "y" : 2,
                "drilldown" : "Yet Ebreo"
             }
-         ],
-         "colorByPoint" : 1,
-         "name" : "Perl Weekly Challenge - 053"
+         ]
       }
    ],
-   "plotOptions" : {
-      "series" : {
-         "borderWidth" : 0,
-         "dataLabels" : {
-            "format" : "{point.y}",
-            "enabled" : 1
-         }
-      }
-   },
-   "yAxis" : {
-      "title" : {
-         "text" : "Total Solutions"
-      }
-   },
-   "xAxis" : {
-      "type" : "category"
+   "title" : {
+      "text" : "Perl Weekly Challenge - 053"
    },
-   "subtitle" : {
-      "text" : "[Champions: 20] Last updated at 2020-03-28 12:59:03 GMT"
+   "legend" : {
+      "enabled" : 0
    },
    "drilldown" : {
       "series" : [
          {
-            "name" : "Andrezgz",
-            "id" : "Andrezgz",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "name" : "Andrezgz",
+            "id" : "Andrezgz"
          },
          {
             "name" : "Arne Sommer",
-            "id" : "Arne Sommer",
             "data" : [
                [
                   "Raku",
@@ -165,9 +141,12 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "id" : "Arne Sommer"
          },
          {
+            "id" : "Athanasius",
+            "name" : "Athanasius",
             "data" : [
                [
                   "Perl",
@@ -177,29 +156,27 @@
                   "Raku",
                   2
                ]
-            ],
-            "name" : "Athanasius",
-            "id" : "Athanasius"
+            ]
          },
          {
-            "name" : "Cheok-Yin Fung",
             "id" : "Cheok-Yin Fung",
             "data" : [
                [
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "name" : "Cheok-Yin Fung"
          },
          {
-            "name" : "Dave Cross",
-            "id" : "Dave Cross",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "name" : "Dave Cross",
+            "id" : "Dave Cross"
          },
          {
             "data" : [
@@ -216,17 +193,16 @@
             "id" : "Dave Jacoby"
          },
          {
-            "name" : "E. Choroba",
             "id" : "E. Choroba",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "name" : "E. Choroba"
          },
          {
-            "name" : "Javier Luque",
             "id" : "Javier Luque",
             "data" : [
                [
@@ -241,21 +217,38 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "name" : "Javier Luque"
          },
          {
+            "id" : "Laurent Rosenfeld",
             "data" : [
                [
                   "Perl",
                   2
+               ],
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
                ]
             ],
+            "name" : "Laurent Rosenfeld"
+         },
+         {
+            "id" : "Lubos Kolouch",
             "name" : "Lubos Kolouch",
-            "id" : "Lubos Kolouch"
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ]
          },
          {
-            "name" : "Luca Ferrari",
-            "id" : "Luca Ferrari",
             "data" : [
                [
                   "Raku",
@@ -265,7 +258,9 @@
                   "Blog",
                   2
                ]
-            ]
+            ],
+            "name" : "Luca Ferrari",
+            "id" : "Luca Ferrari"
          },
          {
             "data" : [
@@ -278,8 +273,6 @@
             "id" : "Mark Anderson"
          },
          {
-            "name" : "Markus Holzer",
-            "id" : "Markus Holzer",
             "data" : [
                [
                   "Perl",
@@ -289,11 +282,11 @@
                   "Raku",
                   2
                ]
-            ]
+            ],
+            "name" : "Markus Holzer",
+            "id" : "Markus Holzer"
          },
          {
-            "id" : "Mohammad S Anwar",
-            "name" : "Mohammad S Anwar",
             "data" : [
                [
                   "Perl",
@@ -307,21 +300,22 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "name" : "Mohammad S Anwar",
+            "id" : "Mohammad S Anwar"
          },
          {
-            "name" : "Pete Houston",
-            "id" : "Pete Houston",
             "data" : [
                [
                   "Perl",
                   1
                ]
-            ]
+            ],
+            "name" : "Pete Houston",
+            "id" : "Pete Houston"
          },
          {
             "id" : "Roger Bell West",
-            "name" : "Roger Bell West",
             "data" : [
                [
                   "Perl",
@@ -331,58 +325,87 @@
                   "Raku",
                   2
                ]
-            ]
+            ],
+            "name" : "Roger Bell West"
          },
          {
-            "name" : "Saif Ahmed",
             "id" : "Saif Ahmed",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "name" : "Saif Ahmed"
          },
          {
+            "id" : "Simon Proctor",
             "data" : [
                [
                   "Raku",
                   2
                ]
             ],
-            "id" : "Simon Proctor",
             "name" : "Simon Proctor"
          },
          {
+            "id" : "Ulrich Rieke",
+            "name" : "Ulrich Rieke",
             "data" : [
                [
                   "Raku",
                   2
                ]
-            ],
-            "name" : "Ulrich Rieke",
-            "id" : "Ulrich Rieke"
+            ]
          },
          {
-            "name" : "Wanderdoc",
-            "id" : "Wanderdoc",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "name" : "Wanderdoc",
+            "id" : "Wanderdoc"
          },
          {
-            "id" : "Yet Ebreo",
-            "name" : "Yet Ebreo",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "name" : "Yet Ebreo",
+            "id" : "Yet Ebreo"
          }
       ]
+   },
+   "yAxis" : {
+      "title" : {
+         "text" : "Total Solutions"
+      }
+   },
+   "tooltip" : {
+      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>",
+      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>",
+      "followPointer" : 1
+   },
+   "plotOptions" : {
+      "series" : {
+         "borderWidth" : 0,
+         "dataLabels" : {
+            "format" : "{point.y}",
+            "enabled" : 1
+         }
+      }
+   },
+   "chart" : {
+      "type" : "column"
+   },
+   "subtitle" : {
+      "text" : "[Champions: 21] Last updated at 2020-03-28 13:14:33 GMT"
+   },
+   "xAxis" : {
+      "type" : "category"
    }
 }
diff --git a/stats/pwc-language-breakdown-summary.json b/stats/pwc-language-breakdown-summary.json
index 0c61a95ffc..1a7c70f527 100644
--- a/stats/pwc-language-breakdown-summary.json
+++ b/stats/pwc-language-breakdown-summary.json
@@ -1,63 +1,63 @@
 {
-   "xAxis" : {
-      "labels" : {
-         "style" : {
-            "fontSize" : "13px",
-            "fontFamily" : "Verdana, sans-serif"
-         }
-      },
-      "type" : "category"
-   },
-   "yAxis" : {
-      "min" : 0,
-      "title" : {
-         "text" : null
-      }
-   },
-   "subtitle" : {
-      "text" : "Last updated at 2020-03-28 12:59:03 GMT"
-   },
-   "chart" : {
-      "type" : "column"
-   },
    "series" : [
       {
+         "dataLabels" : {
+            "style" : {
+               "fontSize" : "13px",
+               "fontFamily" : "Verdana, sans-serif"
+            },
+            "rotation" : -90,
+            "enabled" : "true",
+            "align" : "right",
+            "format" : "{point.y:.0f}",
+            "y" : 10,
+            "color" : "#FFFFFF"
+         },
+         "name" : "Contributions",
          "data" : [
             [
                "Blog",
-               574
+               575
             ],
             [
                "Perl",
-               2232
+               2234
             ],
             [
                "Raku",
-               1372
+               1374
             ]
-         ],
-         "dataLabels" : {
-            "format" : "{point.y:.0f}",
-            "align" : "right",
-            "color" : "#FFFFFF",
-            "enabled" : "true",
-            "rotation" : -90,
-            "style" : {
-               "fontSize" : "13px",
-               "fontFamily" : "Verdana, sans-serif"
-            },
-            "y" : 10
-         },
-         "name" : "Contributions"
+         ]
       }
    ],
    "title" : {
       "text" : "Perl Weekly Challenge Contributions [2019 - 2020]"
    },
+   "legend" : {
+      "enabled" : "false"
+   },
+   "subtitle" : {
+      "text" : "Last updated at 2020-03-28 13:14:33 GMT"
+   },
+   "xAxis" : {
+      "type" : "category",
+      "labels" : {
+         "style" : {
+            "fontFamily" : "Verdana, sans-serif",
+            "fontSize" : "13px"
+         }
+      }
+   },
+   "yAxis" : {
+      "min" : 0,
+      "title" : {
+         "text" : null
+      }
+   },
    "tooltip" : {
       "pointFormat" : "<b>{point.y:.0f}</b>"
    },
-   "legend" : {
-      "enabled" : "false"
+   "chart" : {
+      "type" : "column"
    }
 }
diff --git a/stats/pwc-language-breakdown.json b/stats/pwc-language-breakdown.json
index 2c8b1664a7..c4060de4d1 100644
--- a/stats/pwc-language-breakdown.json
+++ b/stats/pwc-language-breakdown.json
@@ -1,312 +1,7 @@
 {
-   "chart" : {
-      "type" : "column"
-   },
-   "title" : {
-      "text" : "Perl Weekly Challenge Language"
-   },
-   "tooltip" : {
-      "headerFormat" : "<span style=\"font-size:11px\"></span>",
-      "followPointer" : "true",
-      "pointFormat" : "<span style=\"color:{point.color}\">Challenge {point.name}</span>: <b>{point.y:f}</b><br/>"
-   },
-   "legend" : {
-      "enabled" : "false"
-   },
-   "series" : [
-      {
-         "name" : "Perl Weekly Challenge Languages",
-         "colorByPoint" : "true",
-         "data" : [
-            {
-               "y" : 140,
-               "name" : "#001",
-               "drilldown" : "001"
-            },
-            {
-               "name" : "#002",
-               "y" : 109,
-               "drilldown" : "002"
-            },
-            {
-               "y" : 71,
-               "name" : "#003",
-               "drilldown" : "003"
-            },
-            {
-               "drilldown" : "004",
-               "y" : 91,
-               "name" : "#004"
-            },
-            {
-               "drilldown" : "005",
-               "name" : "#005",
-               "y" : 71
-            },
-            {
-               "drilldown" : "006",
-               "y" : 52,
-               "name" : "#006"
-            },
-            {
-               "drilldown" : "007",
-               "name" : "#007",
-               "y" : 58
-            },
-            {
-               "drilldown" : "008",
-               "y" : 70,
-               "name" : "#008"
-            },
-            {
-               "drilldown" : "009",
-               "name" : "#009",
-               "y" : 68
-            },
-            {
-               "name" : "#010",
-               "y" : 60,
-               "drilldown" : "010"
-            },
-            {
-               "drilldown" : "011",
-               "y" : 79,
-               "name" : "#011"
-            },
-            {
-               "name" : "#012",
-               "y" : 83,
-               "drilldown" : "012"
-            },
-            {
-               "drilldown" : "013",
-               "name" : "#013",
-               "y" : 76
-            },
-            {
-               "drilldown" : "014",
-               "y" : 96,
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                [
@@ -321,11 +16,10 @@
                   "Blog",
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                ]
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