- Added solutions by Alexander Karelas.

14 files changed, 1207 insertions, 1102 deletions

diff --git a/challenge-089/alexander-karelas/perl/ch-1.pl b/challenge-089/alexander-karelas/perl/ch-1.pl
new file mode 100755
index 0000000000..1be2d6fbbd
--- /dev/null
+++ b/challenge-089/alexander-karelas/perl/ch-1.pl
@@ -0,0 +1,30 @@
+#!/usr/bin/env perl
+
+use v5.30;
+use warnings;
+
+my $N = $ARGV[0] or die "Usage: $0 \$N";
+
+my $sum = 0;
+for (my $x = 1; $x <= $N - 1; $x++) {
+    for (my $y = $x + 1; $y <= $N; $y++) {
+        $sum += gcd($x, $y);
+    }
+}
+
+say $sum;
+
+sub gcd {
+    my ($x, $y) = @_;
+
+    if ($x < $y) {
+        ($x, $y) = ($y, $x);
+    }
+
+    if ($y == 0) {
+        return $x;
+    }
+
+    return gcd($y, $x % $y);
+}
+
diff --git a/challenge-089/alexander-karelas/perl/ch-2.pl b/challenge-089/alexander-karelas/perl/ch-2.pl
new file mode 100755
index 0000000000..3d306ca17b
--- /dev/null
+++ b/challenge-089/alexander-karelas/perl/ch-2.pl
@@ -0,0 +1,60 @@
+#!/usr/bin/env perl
+
+use v5.30;
+use warnings;
+
+# 0 1 2
+# 3 4 5
+# 6 7 8
+
+# x y
+# z w
+
+my @winning_rows = (
+    [0, 1, 2],
+    [3, 4, 5],
+    [6, 7, 8],
+    [0, 3, 6],
+    [1, 4, 7],
+    [2, 5, 8],
+    [0, 4, 8],
+    [2, 4, 6],
+);
+
+my %available_numbers;
+
+sub reset_available {
+    %available_numbers = map {($_, 1)} (1 .. 9);
+}
+
+for my $x (1 .. 9) {
+    for my $y (1 .. 9) {
+        next if $y == $x;
+        for my $z (1 .. 9) {
+            next if $z == $y or $z == $x;
+            for my $w (1 .. 9) {
+                next if $w == $z or $w == $y or $w == $x;
+                reset_available();
+                delete @available_numbers{($x, $y, $z, $w)};
+                my $num_0_2 = 15 - $x - $y;
+                next unless delete $available_numbers{$num_0_2};
+                my $num_1_2 = 15 - $z - $w;
+                next unless delete $available_numbers{$num_1_2};
+                my $num_2_0 = 15 - $x - $z;
+                next unless delete $available_numbers{$num_2_0};
+                my $num_2_1 = 15 - $y - $w;
+                next unless delete $available_numbers{$num_2_1};
+                my $num_2_2 = 15 - $num_2_0 - $num_2_1;
+                next unless delete $available_numbers{$num_2_2};
+
+                next unless $x + $w + $num_2_2 == 15;
+                next unless $num_0_2 + $w + $num_2_0 == 15;
+
+                print "[ $x $y $num_0_2 ]\n";
+                print "[ $z $w $num_1_2 ]\n";
+                print "[ $num_2_0 $num_2_1 $num_2_2 ]\n";
+                print "=================\n";
+            }
+        }
+    }
+}
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index 706fa8062d..9c336389d7 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -1,174 +1,8 @@
 {
-   "xAxis" : {
-      "type" : "category"
-   },
-   "subtitle" : {
-      "text" : "[Champions: 26] Last updated at 2020-12-06 13:49:27 GMT"
-   },
-   "title" : {
-      "text" : "Perl Weekly Challenge - 089"
-   },
-   "plotOptions" : {
-      "series" : {
-         "borderWidth" : 0,
-         "dataLabels" : {
-            "format" : "{point.y}",
-            "enabled" : 1
-         }
-      }
-   },
-   "chart" : {
-      "type" : "column"
-   },
-   "series" : [
-      {
-         "data" : [
-            {
-               "y" : 3,
-               "drilldown" : "Aaron Smith",
-               "name" : "Aaron Smith"
-            },
-            {
-               "name" : "Abigail",
-               "y" : 2,
-               "drilldown" : "Abigail"
-            },
-            {
-               "y" : 2,
-               "drilldown" : "Alexander Pankoff",
-               "name" : "Alexander Pankoff"
-            },
-            {
-               "name" : "Andrew Shitov",
-               "drilldown" : "Andrew Shitov",
-               "y" : 2
-            },
-            {
-               "y" : 5,
-               "drilldown" : "Arne Sommer",
-               "name" : "Arne Sommer"
-            },
-            {
-               "name" : "Athanasius",
-               "y" : 4,
-               "drilldown" : "Athanasius"
-            },
-            {
-               "y" : 2,
-               "drilldown" : "Clifton Wood",
-               "name" : "Clifton Wood"
-            },
-            {
-               "y" : 3,
-               "drilldown" : "Dave Jacoby",
-               "name" : "Dave Jacoby"
-            },
-            {
-               "drilldown" : "Feng Chang",
-               "y" : 2,
-               "name" : "Feng Chang"
-            },
-            {
-               "name" : "James Smith",
-               "y" : 2,
-               "drilldown" : "James Smith"
-            },
-            {
-               "y" : 2,
-               "drilldown" : "Jan Krnavek",
-               "name" : "Jan Krnavek"
-            },
-            {
-               "name" : "Joel Crosswhite",
-               "drilldown" : "Joel Crosswhite",
-               "y" : 2
-            },
-            {
-               "drilldown" : "Jorg Sommrey",
-               "y" : 2,
-               "name" : "Jorg Sommrey"
-            },
-            {
-               "drilldown" : "Kang-min Liu",
-               "y" : 4,
-               "name" : "Kang-min Liu"
-            },
-            {
-               "name" : "Lubos Kolouch",
-               "drilldown" : "Lubos Kolouch",
-               "y" : 2
-            },
-            {
-               "name" : "Mark Anderson",
-               "y" : 2,
-               "drilldown" : "Mark Anderson"
-            },
-            {
-               "name" : "Miguel Prz",
-               "drilldown" : "Miguel Prz",
-               "y" : 2
-            },
-            {
-               "y" : 2,
-               "drilldown" : "Nuno Vieira",
-               "name" : "Nuno Vieira"
-            },
-            {
-               "drilldown" : "Philip Hood",
-               "y" : 2,
-               "name" : "Philip Hood"
-            },
-            {
-               "name" : "Roger Bell_West",
-               "drilldown" : "Roger Bell_West",
-               "y" : 5
-            },
-            {
-               "y" : 3,
-               "drilldown" : "Simon Green",
-               "name" : "Simon Green"
-            },
-            {
-               "name" : "Simon Proctor",
-               "drilldown" : "Simon Proctor",
-               "y" : 2
-            },
-            {
-               "y" : 2,
-               "drilldown" : "Stuart Little",
-               "name" : "Stuart Little"
-            },
-            {
-               "name" : "Ulrich Rieke",
-               "y" : 4,
-               "drilldown" : "Ulrich Rieke"
-            },
-            {
-               "y" : 3,
-               "drilldown" : "W. Luis Mochan",
-               "name" : "W. Luis Mochan"
-            },
-            {
-               "name" : "Walt Mankowski",
-               "drilldown" : "Walt Mankowski",
-               "y" : 3
-            }
-         ],
-         "name" : "Perl Weekly Challenge - 089",
-         "colorByPoint" : 1
-      }
-   ],
-   "legend" : {
-      "enabled" : 0
-   },
-   "yAxis" : {
-      "title" : {
-         "text" : "Total Solutions"
-      }
-   },
    "drilldown" : {
       "series" : [
          {
+            "name" : "Aaron Smith",
             "data" : [
                [
                   "Raku",
@@ -179,31 +13,41 @@
                   1
                ]
             ],
-            "name" : "Aaron Smith",
             "id" : "Aaron Smith"
          },
          {
             "id" : "Abigail",
-            "name" : "Abigail",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "name" : "Abigail"
+         },
+         {
+            "id" : "Alexander Karelas",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ],
+            "name" : "Alexander Karelas"
          },
          {
-            "id" : "Alexander Pankoff",
             "name" : "Alexander Pankoff",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "id" : "Alexander Pankoff"
          },
          {
             "name" : "Andrew Shitov",
+            "id" : "Andrew Shitov",
             "data" : [
                [
                   "Perl",
@@ -213,11 +57,10 @@
                   "Raku",
                   1
                ]
-            ],
-            "id" : "Andrew Shitov"
+            ]
          },
          {
-            "name" : "Arne Sommer",
+            "id" : "Arne Sommer",
             "data" : [
                [
                   "Perl",
@@ -232,10 +75,10 @@
                   1
                ]
             ],
-            "id" : "Arne Sommer"
+            "name" : "Arne Sommer"
          },
          {
-            "id" : "Athanasius",
+            "name" : "Athanasius",
             "data" : [
                [
                   "Perl",
@@ -246,7 +89,7 @@
                   2
                ]
             ],
-            "name" : "Athanasius"
+            "id" : "Athanasius"
          },
          {
             "id" : "Clifton Wood",
@@ -259,7 +102,6 @@
             "name" : "Clifton Wood"
          },
          {
-            "name" : "Dave Jacoby",
             "data" : [
                [
                   "Perl",
@@ -270,7 +112,8 @@
                   1
                ]
             ],
-            "id" : "Dave Jacoby"
+            "id" : "Dave Jacoby",
+            "name" : "Dave Jacoby"
          },
          {
             "name" : "Feng Chang",
@@ -283,14 +126,14 @@
             "id" : "Feng Chang"
          },
          {
-            "id" : "James Smith",
             "name" : "James Smith",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "id" : "James Smith"
          },
          {
             "id" : "Jan Krnavek",
@@ -304,23 +147,23 @@
          },
          {
             "name" : "Joel Crosswhite",
+            "id" : "Joel Crosswhite",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ],
-            "id" : "Joel Crosswhite"
+            ]
          },
          {
-            "id" : "Jorg Sommrey",
+            "name" : "Jorg Sommrey",
             "data" : [
                [
                   "Perl",
                   2
                ]
             ],
-            "name" : "Jorg Sommrey"
+            "id" : "Jorg Sommrey"
          },
          {
             "data" : [
@@ -333,28 +176,28 @@
                   2
                ]
             ],
-            "name" : "Kang-min Liu",
-            "id" : "Kang-min Liu"
+            "id" : "Kang-min Liu",
+            "name" : "Kang-min Liu"
          },
          {
+            "name" : "Lubos Kolouch",
             "id" : "Lubos Kolouch",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ],
-            "name" : "Lubos Kolouch"
+            ]
          },
          {
-            "name" : "Mark Anderson",
+            "id" : "Mark Anderson",
             "data" : [
                [
                   "Raku",
                   2
                ]
             ],
-            "id" : "Mark Anderson"
+            "name" : "Mark Anderson"
          },
          {
             "name" : "Miguel Prz",
@@ -373,21 +216,20 @@
                   2
                ]
             ],
-            "name" : "Nuno Vieira",
-            "id" : "Nuno Vieira"
+            "id" : "Nuno Vieira",
+            "name" : "Nuno Vieira"
          },
          {
-            "name" : "Philip Hood",
+            "id" : "Philip Hood",
             "data" : [
                [
                   "Raku",
                   2
                ]
             ],
-            "id" : "Philip Hood"
+            "name" : "Philip Hood"
          },
          {
-            "id" : "Roger Bell_West",
             "data" : [
                [
                   "Perl",
@@ -402,6 +244,7 @@
                   1
                ]
             ],
+            "id" : "Roger Bell_West",
             "name" : "Roger Bell_West"
          },
          {
@@ -419,24 +262,24 @@
             "id" : "Simon Green"
          },
          {
-            "id" : "Simon Proctor",
             "name" : "Simon Proctor",
             "data" : [
                [
                   "Raku",
                   2
                ]
-            ]
+            ],
+            "id" : "Simon Proctor"
          },
          {
+            "name" : "Stuart Little",
             "id" : "Stuart Little",
             "data" : [
                [
                   "Raku",
                   2
                ]
-            ],
-            "name" : "Stuart Little"
+            ]
          },
          {
             "data" : [
@@ -449,12 +292,10 @@
                   2
                ]
             ],
-            "name" : "Ulrich Rieke",
-            "id" : "Ulrich Rieke"
+            "id" : "Ulrich Rieke",
+            "name" : "Ulrich Rieke"
          },
          {
-            "id" : "W. Luis Mochan",
-            "name" : "W. Luis Mochan",
             "data" : [
                [
                   "Perl",
@@ -464,10 +305,13 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "id" : "W. Luis Mochan",
+            "name" : "W. Luis Mochan"
          },
          {
             "name" : "Walt Mankowski",
+            "id" : "Walt Mankowski",
             "data" : [
                [
                   "Perl",
@@ -477,14 +321,185 @@
                   "Blog",
                   1
                ]
-            ],
-            "id" : "Walt Mankowski"
+            ]
          }
       ]
    },
+   "title" : {
+      "text" : "Perl Weekly Challenge - 089"
+   },
+   "legend" : {
+      "enabled" : 0
+   },
+   "series" : [
+      {
+         "data" : [
+            {
+               "y" : 3,
+               "name" : "Aaron Smith",
+               "drilldown" : "Aaron Smith"
+            },
+            {
+               "y" : 2,
+               "name" : "Abigail",
+               "drilldown" : "Abigail"
+            },
+            {
+               "drilldown" : "Alexander Karelas",
+               "name" : "Alexander Karelas",
+               "y" : 2
+            },
+            {
+               "drilldown" : "Alexander Pankoff",
+               "name" : "Alexander Pankoff",
+               "y" : 2
+            },
+            {
+               "name" : "Andrew Shitov",
+               "drilldown" : "Andrew Shitov",
+               "y" : 2
+            },
+            {
+               "drilldown" : "Arne Sommer",
+               "name" : "Arne Sommer",
+               "y" : 5
+            },
+            {
+               "y" : 4,
+               "drilldown" : "Athanasius",
+               "name" : "Athanasius"
+            },
+            {
+               "y" : 2,
+               "name" : "Clifton Wood",
+               "drilldown" : "Clifton Wood"
+            },
+            {
+               "drilldown" : "Dave Jacoby",
+               "name" : "Dave Jacoby",
+               "y" : 3
+            },
+            {
+               "y" : 2,
+               "name" : "Feng Chang",
+               "drilldown" : "Feng Chang"
+            },
+            {
+               "name" : "James Smith",
+               "drilldown" : "James Smith",
+               "y" : 2
+            },
+            {
+               "drilldown" : "Jan Krnavek",
+               "name" : "Jan Krnavek",
+               "y" : 2
+            },
+            {
+               "name" : "Joel Crosswhite",
+               "drilldown" : "Joel Crosswhite",
+               "y" : 2
+            },
+            {
+               "drilldown" : "Jorg Sommrey",
+               "name" : "Jorg Sommrey",
+               "y" : 2
+            },
+            {
+               "y" : 4,
+               "name" : "Kang-min Liu",
+               "drilldown" : "Kang-min Liu"
+            },
+            {
+               "drilldown" : "Lubos Kolouch",
+               "name" : "Lubos Kolouch",
+               "y" : 2
+            },
+            {
+               "y" : 2,
+               "name" : "Mark Anderson",
+               "drilldown" : "Mark Anderson"
+            },
+            {
+               "y" : 2,
+               "drilldown" : "Miguel Prz",
+               "name" : "Miguel Prz"
+            },
+            {
+               "name" : "Nuno Vieira",
+               "drilldown" : "Nuno Vieira",
+               "y" : 2
+            },
+            {
+               "y" : 2,
+               "drilldown" : "Philip Hood",
+               "name" : "Philip Hood"
+            },
+            {
+               "y" : 5,
+               "drilldown" : "Roger Bell_West",
+               "name" : "Roger Bell_West"
+            },
+            {
+               "name" : "Simon Green",
+               "drilldown" : "Simon Green",
+               "y" : 3
+            },
+            {
+               "y" : 2,
+               "name" : "Simon Proctor",
+               "drilldown" : "Simon Proctor"
+            },
+            {
+               "name" : "Stuart Little",
+               "drilldown" : "Stuart Little",
+               "y" : 2
+            },
+            {
+               "y" : 4,
+               "name" : "Ulrich Rieke",
+               "drilldown" : "Ulrich Rieke"
+            },
+            {
+               "drilldown" : "W. Luis Mochan",
+               "name" : "W. Luis Mochan",
+               "y" : 3
+            },
+            {
+               "name" : "Walt Mankowski",
+               "drilldown" : "Walt Mankowski",
+               "y" : 3
+            }
+         ],
+         "colorByPoint" : 1,
+         "name" : "Perl Weekly Challenge - 089"
+      }
+   ],
    "tooltip" : {
-      "followPointer" : 1,
+      "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/>",
-      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>"
+      "followPointer" : 1
+   },
+   "plotOptions" : {
+      "series" : {
+         "borderWidth" : 0,
+         "dataLabels" : {
+            "enabled" : 1,
+            "format" : "{point.y}"
+         }
+      }
+   },
+   "subtitle" : {
+      "text" : "[Champions: 27] Last updated at 2020-12-06 13:56:08 GMT"
+   },
+   "chart" : {
+      "type" : "column"
+   },
+   "xAxis" : {
+      "type" : "category"
+   },
+   "yAxis" : {
+      "title" : {
+         "text" : "Total Solutions"
+      }
    }
 }
diff --git a/stats/pwc-language-breakdown-summary.json b/stats/pwc-language-breakdown-summary.json
index f444712cc2..19edef85a2 100644
--- a/stats/pwc-language-breakdown-summary.json
+++ b/stats/pwc-language-breakdown-summary.json
@@ -1,34 +1,6 @@
 {
-   "subtitle" : {
-      "text" : "Last updated at 2020-12-06 13:49:26 GMT"
-   },
-   "title" : {
-      "text" : "Perl Weekly Challenge Contributions [2019 - 2020]"
-   },
-   "xAxis" : {
-      "labels" : {
-         "style" : {
-            "fontSize" : "13px",
-            "fontFamily" : "Verdana, sans-serif"
-         }
-      },
-      "type" : "category"
-   },
-   "yAxis" : {
-      "min" : 0,
-      "title" : {
-         "text" : null
-      }
-   },
-   "tooltip" : {
-      "pointFormat" : "<b>{point.y:.0f}</b>"
-   },
-   "legend" : {
-      "enabled" : "false"
-   },
    "series" : [
       {
-         "name" : "Contributions",
          "data" : [
             [
                "Blog",
@@ -36,7 +8,7 @@
             ],
             [
                "Perl",
-               3995
+               3997
             ],
             [
                "Raku",
@@ -44,20 +16,48 @@
             ]
          ],
          "dataLabels" : {
-            "enabled" : "true",
-            "y" : 10,
-            "align" : "right",
             "color" : "#FFFFFF",
-            "format" : "{point.y:.0f}",
+            "rotation" : -90,
+            "y" : 10,
             "style" : {
                "fontFamily" : "Verdana, sans-serif",
                "fontSize" : "13px"
             },
-            "rotation" : -90
-         }
+            "enabled" : "true",
+            "align" : "right",
+            "format" : "{point.y:.0f}"
+         },
+         "name" : "Contributions"
       }
    ],
+   "legend" : {
+      "enabled" : "false"
+   },
+   "title" : {
+      "text" : "Perl Weekly Challenge Contributions [2019 - 2020]"
+   },
+   "yAxis" : {
+      "title" : {
+         "text" : null
+      },
+      "min" : 0
+   },
+   "xAxis" : {
+      "type" : "category",
+      "labels" : {
+         "style" : {
+            "fontFamily" : "Verdana, sans-serif",
+            "fontSize" : "13px"
+         }
+      }
+   },
    "chart" : {
       "type" : "column"
+   },
+   "subtitle" : {
+      "text" : "Last updated at 2020-12-06 13:56:08 GMT"
+   },
+   "tooltip" : {
+      "pointFormat" : "<b>{point.y:.0f}</b>"
    }
 }
diff --git a/stats/pwc-language-breakdown.json b/stats/pwc-language-breakdown.json
index 5f923a01e3..4f173def8b 100644
--- a/stats/pwc-language-breakdown.json
+++ b/stats/pwc-language-breakdown.json
@@ -1,13 +1,7 @@
 {
-   "subtitle" : {
-      "text" : "Click the columns to drilldown the language breakdown. Last updated at 2020-12-06 13:49:27 GMT"
-   },
    "title" : {
       "text" : "Perl Weekly Challenge Language"
    },
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@@ -43,8 +37,8 @@
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@@ -65,8 +59,6 @@
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@@ -80,7 +72,9 @@
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@@ -101,8 +95,6 @@
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@@ -116,10 +108,11 @@
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@@ -134,10 +127,11 @@
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@@ -152,7 +146,7 @@
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@@ -188,7 +181,8 @@
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@@ -259,10 +253,11 @@
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@@ -277,8 +272,7 @@
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@@ -317,8 +311,6 @@
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@@ -332,9 +324,13 @@
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@@ -348,12 +344,10 @@
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@@ -368,9 +362,11 @@
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@@ -384,11 +380,11 @@
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@@ -402,12 +398,9 @@
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@@ -422,9 +415,11 @@
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@@ -439,11 +434,9 @@
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@@ -458,11 +451,12 @@
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@@ -479,7 +473,6 @@
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@@ -494,10 +487,10 @@
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