- Added solutions by Flavio Poletti.

21 files changed, 2753 insertions, 2638 deletions

diff --git a/challenge-218/polettix/blog.txt b/challenge-218/polettix/blog.txt
new file mode 100644
index 0000000000..f4a682423a
--- /dev/null
+++ b/challenge-218/polettix/blog.txt
@@ -0,0 +1 @@
+https://github.polettix.it/ETOOBUSY/2023/05/25/pwc218-maximum-product/
diff --git a/challenge-218/polettix/blog1.txt b/challenge-218/polettix/blog1.txt
new file mode 100644
index 0000000000..fc61cfb26b
--- /dev/null
+++ b/challenge-218/polettix/blog1.txt
@@ -0,0 +1 @@
+https://github.polettix.it/ETOOBUSY/2023/05/26/pwc218-matrix-score/
diff --git a/challenge-218/polettix/perl/ch-1.pl b/challenge-218/polettix/perl/ch-1.pl
new file mode 100644
index 0000000000..6cf474333c
--- /dev/null
+++ b/challenge-218/polettix/perl/ch-1.pl
@@ -0,0 +1,13 @@
+#!/usr/bin/env perl
+use v5.24;
+use warnings;
+use experimental 'signatures';
+
+say maximum_product(@ARGV);
+
+sub maximum_product (@list) {
+   @list = sort { $a <=> $b } @list;
+   my $below = $list[0] * $list[1] * $list[-1];
+   my $above = $list[-3] * $list[-2] * $list[-1];
+   return $below > $above ? $below : $above;
+}
diff --git a/challenge-218/polettix/perl/ch-2.pl b/challenge-218/polettix/perl/ch-2.pl
new file mode 100644
index 0000000000..2f4ec00158
--- /dev/null
+++ b/challenge-218/polettix/perl/ch-2.pl
@@ -0,0 +1,40 @@
+#!/usr/bin/env perl
+use v5.24;
+use warnings;
+use experimental 'signatures';
+use List::Util 'sum';
+
+say matrix_score($_) for test_matrixes();
+
+sub matrix_score ($matrix) {
+   my $n_rows = $matrix->@*;
+   my $threshold = int($n_rows / 2) + ($n_rows % 2);
+   for my $r (0 .. $n_rows - 1) {
+      toggle_row($matrix, $r) unless $matrix->[$r][0];
+   }
+   for my $c (1 .. $matrix->[0]->$#*) {
+      toggle_col($matrix, $c) if count_col($matrix, $c) < $threshold;
+   }
+   return sum(map { binarr_to_dec($_) } $matrix->@*);
+}
+
+sub binarr_to_dec ($row) {
+   my $v = 0;
+   $v = ($v << 1) | ($row->[$_] ? 1 : 0) for 0 .. $row->$#*;
+   return $v;
+}
+
+sub toggle_row ($m, $r) {
+   $m->[$r][$_] = 1 - $m->[$r][$_] for 0 .. $m->[$r]->$#*;
+}
+
+sub toggle_col ($matrix, $c) { $_->[$c] = 1 - $_->[$c] for $matrix->@* }
+
+sub count_col ($m, $c) { sum(map { $_->[$c] ? 1 : 0 } $m->@*) // 0 }
+
+sub test_matrixes {
+   return (
+      [[0, 0, 1, 1], [1, 0, 1, 0], [1, 1, 0, 0]],
+      [[0]],
+   );
+}
diff --git a/challenge-218/polettix/raku/ch-1.raku b/challenge-218/polettix/raku/ch-1.raku
new file mode 100644
index 0000000000..607aabbd61
--- /dev/null
+++ b/challenge-218/polettix/raku/ch-1.raku
@@ -0,0 +1,10 @@
+#!/usr/bin/env raku
+use v6;
+sub MAIN (*@args) { say maximum-product(@args) }
+
+sub maximum-product (@args) {
+   my @sorted = @args».Int.sort;
+   my $below = @sorted[0] * @sorted[1] * @sorted[* - 1];
+   my $above = [*] @sorted.reverse[0..2];
+   return ($below, $above).max;
+}
diff --git a/challenge-218/polettix/raku/ch-2.raku b/challenge-218/polettix/raku/ch-2.raku
new file mode 100644
index 0000000000..38195f22d2
--- /dev/null
+++ b/challenge-218/polettix/raku/ch-2.raku
@@ -0,0 +1,27 @@
+#!/usr/bin/env raku
+use v6;
+sub MAIN {
+   my @tests =
+      [[0, 0, 1, 1], [1, 0, 1, 0], [1, 1, 0, 0]],
+      [[0],],
+   ;
+   put(matrix-score($_)) for @tests;
+}
+
+sub matrix-score ($matrix) {
+   my $n-rows = $matrix.elems;
+   my $threshold = ($n-rows div 2) + ($n-rows % 2);
+   for ^$n-rows -> $r {
+      toggle-row($matrix, $r) unless $matrix[$r][0];
+   }
+   for 1 .. $matrix[0].end -> $c {
+      toggle-col($matrix, $c) if count-col($matrix, $c) < $threshold;
+   }
+   return $matrix.map({ $_.join('').parse-base(2) }).sum;
+}
+
+sub toggle-row ($m, $r) { $m[$r][$_] = 1 - $m[$r][$_] for 0 .. $m[0].end }
+
+sub toggle-col ($matrix, $c) { $_[$c] = 1 - $_[$c] for @$matrix }
+
+sub count-col ($matrix, $c) { $matrix.map({ $_[$c] }).sum }
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index 3fdbb9a1bb..b043dea73b 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -1,33 +1,173 @@
 {
+   "series" : [
+      {
+         "data" : [
+            {
+               "drilldown" : "Arne Sommer",
+               "name" : "Arne Sommer",
+               "y" : 3
+            },
+            {
+               "name" : "Athanasius",
+               "y" : 2,
+               "drilldown" : "Athanasius"
+            },
+            {
+               "drilldown" : "Avery Adams",
+               "y" : 3,
+               "name" : "Avery Adams"
+            },
+            {
+               "name" : "BarrOff",
+               "y" : 2,
+               "drilldown" : "BarrOff"
+            },
+            {
+               "drilldown" : "Bruce Gray",
+               "y" : 2,
+               "name" : "Bruce Gray"
+            },
+            {
+               "drilldown" : "Cheok-Yin Fung",
+               "y" : 2,
+               "name" : "Cheok-Yin Fung"
+            },
+            {
+               "name" : "David Ferrone",
+               "y" : 2,
+               "drilldown" : "David Ferrone"
+            },
+            {
+               "drilldown" : "E. Choroba",
+               "y" : 2,
+               "name" : "E. Choroba"
+            },
+            {
+               "y" : 6,
+               "name" : "Flavio Poletti",
+               "drilldown" : "Flavio Poletti"
+            },
+            {
+               "drilldown" : "Jaldhar H. Vyas",
+               "y" : 5,
+               "name" : "Jaldhar H. Vyas"
+            },
+            {
+               "drilldown" : "Jan Krnavek",
+               "y" : 1,
+               "name" : "Jan Krnavek"
+            },
+            {
+               "y" : 2,
+               "name" : "Jorg Sommrey",
+               "drilldown" : "Jorg Sommrey"
+            },
+            {
+               "y" : 2,
+               "name" : "Lubos Kolouch",
+               "drilldown" : "Lubos Kolouch"
+            },
+            {
+               "drilldown" : "Mark Anderson",
+               "y" : 2,
+               "name" : "Mark Anderson"
+            },
+            {
+               "drilldown" : "Matthias Muth",
+               "name" : "Matthias Muth",
+               "y" : 3
+            },
+            {
+               "drilldown" : "Niels van Dijke",
+               "y" : 2,
+               "name" : "Niels van Dijke"
+            },
+            {
+               "name" : "Paulo Custodio",
+               "y" : 2,
+               "drilldown" : "Paulo Custodio"
+            },
+            {
+               "drilldown" : "Peter Campbell Smith",
+               "y" : 3,
+               "name" : "Peter Campbell Smith"
+            },
+            {
+               "name" : "Robbie Hatley",
+               "y" : 2,
+               "drilldown" : "Robbie Hatley"
+            },
+            {
+               "name" : "Robert DiCicco",
+               "y" : 4,
+               "drilldown" : "Robert DiCicco"
+            },
+            {
+               "drilldown" : "Robert Ransbottom",
+               "y" : 2,
+               "name" : "Robert Ransbottom"
+            },
+            {
+               "drilldown" : "Roger Bell_West",
+               "name" : "Roger Bell_West",
+               "y" : 5
+            },
+            {
+               "drilldown" : "Simon Green",
+               "y" : 3,
+               "name" : "Simon Green"
+            },
+            {
+               "name" : "Solathian",
+               "y" : 1,
+               "drilldown" : "Solathian"
+            },
+            {
+               "name" : "Stephen G. Lynn",
+               "y" : 3,
+               "drilldown" : "Stephen G. Lynn"
+            },
+            {
+               "drilldown" : "Steven Wilson",
+               "y" : 1,
+               "name" : "Steven Wilson"
+            },
+            {
+               "y" : 4,
+               "name" : "Thomas Kohler",
+               "drilldown" : "Thomas Kohler"
+            },
+            {
+               "drilldown" : "Ulrich Rieke",
+               "y" : 3,
+               "name" : "Ulrich Rieke"
+            },
+            {
+               "name" : "W. Luis Mochan",
+               "y" : 3,
+               "drilldown" : "W. Luis Mochan"
+            }
+         ],
+         "name" : "The Weekly Challenge - 218",
+         "colorByPoint" : 1
+      }
+   ],
+   "xAxis" : {
+      "type" : "category"
+   },
    "yAxis" : {
       "title" : {
          "text" : "Total Solutions"
       }
    },
-   "plotOptions" : {
-      "series" : {
-         "borderWidth" : 0,
-         "dataLabels" : {
-            "format" : "{point.y}",
-            "enabled" : 1
-         }
-      }
-   },
-   "title" : {
-      "text" : "The Weekly Challenge - 218"
-   },
    "tooltip" : {
-      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>",
+      "followPointer" : 1,
       "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>",
-      "followPointer" : 1
-   },
-   "chart" : {
-      "type" : "column"
+      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>"
    },
    "drilldown" : {
       "series" : [
          {
-            "name" : "Arne Sommer",
             "data" : [
                [
                   "Raku",
@@ -38,9 +178,11 @@
                   1
                ]
             ],
-            "id" : "Arne Sommer"
+            "id" : "Arne Sommer",
+            "name" : "Arne Sommer"
          },
          {
+            "name" : "Athanasius",
             "id" : "Athanasius",
             "data" : [
                [
@@ -51,10 +193,11 @@
                   "Raku",
                   1
                ]
-            ],
-            "name" : "Athanasius"
+            ]
          },
          {
+            "name" : "Avery Adams",
+            "id" : "Avery Adams",
             "data" : [
                [
                   "Perl",
@@ -64,9 +207,7 @@
                   "Blog",
                   2
                ]
-            ],
-            "name" : "Avery Adams",
-            "id" : "Avery Adams"
+            ]
          },
          {
             "id" : "BarrOff",
@@ -89,18 +230,18 @@
                   2
                ]
             ],
-            "name" : "Bruce Gray",
-            "id" : "Bruce Gray"
+            "id" : "Bruce Gray",
+            "name" : "Bruce Gray"
          },
          {
+            "id" : "Cheok-Yin Fung",
+            "name" : "Cheok-Yin Fung",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ],
-            "name" : "Cheok-Yin Fung",
-            "id" : "Cheok-Yin Fung"
+            ]
          },
          {
             "data" : [
@@ -113,17 +254,34 @@
             "id" : "David Ferrone"
          },
          {
+            "name" : "E. Choroba",
+            "id" : "E. Choroba",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ],
-            "name" : "E. Choroba",
-            "id" : "E. Choroba"
+            ]
+         },
+         {
+            "id" : "Flavio Poletti",
+            "name" : "Flavio Poletti",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  2
+               ]
+            ]
          },
          {
-            "id" : "Jaldhar H. Vyas",
             "data" : [
                [
                   "Perl",
@@ -138,11 +296,12 @@
                   1
                ]
             ],
+            "id" : "Jaldhar H. Vyas",
             "name" : "Jaldhar H. Vyas"
          },
          {
-            "id" : "Jan Krnavek",
             "name" : "Jan Krnavek",
+            "id" : "Jan Krnavek",
             "data" : [
                [
                   "Raku",
@@ -151,8 +310,8 @@
             ]
          },
          {
-            "id" : "Jorg Sommrey",
             "name" : "Jorg Sommrey",
+            "id" : "Jorg Sommrey",
             "data" : [
                [
                   "Perl",
@@ -161,28 +320,26 @@
             ]
          },
          {
+            "id" : "Lubos Kolouch",
+            "name" : "Lubos Kolouch",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ],
-            "name" : "Lubos Kolouch",
-            "id" : "Lubos Kolouch"
+            ]
          },
          {
+            "id" : "Mark Anderson",
+            "name" : "Mark Anderson",
             "data" : [
                [
                   "Raku",
                   2
                ]
-            ],
-            "name" : "Mark Anderson",
-            "id" : "Mark Anderson"
+            ]
          },
          {
-            "id" : "Matthias Muth",
-            "name" : "Matthias Muth",
             "data" : [
                [
                   "Perl",
@@ -192,29 +349,33 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "name" : "Matthias Muth",
+            "id" : "Matthias Muth"
          },
          {
-            "name" : "Niels van Dijke",
             "data" : [
                [
                   "Perl",
                   2
                ]
             ],
-            "id" : "Niels van Dijke"
+            "id" : "Niels van Dijke",
+            "name" : "Niels van Dijke"
          },
          {
+            "name" : "Paulo Custodio",
             "id" : "Paulo Custodio",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ],
-            "name" : "Paulo Custodio"
+            ]
          },
          {
+            "name" : "Peter Campbell Smith",
+            "id" : "Peter Campbell Smith",
             "data" : [
                [
                   "Perl",
@@ -224,12 +385,9 @@
                   "Blog",
                   1
                ]
-            ],
-            "name" : "Peter Campbell Smith",
-            "id" : "Peter Campbell Smith"
+            ]
          },
          {
-            "id" : "Robbie Hatley",
             "data" : [
                [
                   "Perl",
@@ -240,9 +398,11 @@
                   1
                ]
             ],
+            "id" : "Robbie Hatley",
             "name" : "Robbie Hatley"
          },
          {
+            "name" : "Robert DiCicco",
             "id" : "Robert DiCicco",
             "data" : [
                [
@@ -253,8 +413,7 @@
                   "Raku",
                   2
                ]
-            ],
-            "name" : "Robert DiCicco"
+            ]
          },
          {
             "id" : "Robert Ransbottom",
@@ -285,6 +444,8 @@
             ]
          },
          {
+            "name" : "Simon Green",
+            "id" : "Simon Green",
             "data" : [
                [
                   "Perl",
@@ -294,21 +455,21 @@
                   "Blog",
                   1
                ]
-            ],
-            "name" : "Simon Green",
-            "id" : "Simon Green"
+            ]
          },
          {
             "name" : "Solathian",
+            "id" : "Solathian",
             "data" : [
                [
                   "Perl",
                   1
                ]
-            ],
-            "id" : "Solathian"
+            ]
          },
          {
+            "id" : "Stephen G. Lynn",
+            "name" : "Stephen G. Lynn",
             "data" : [
                [
                   "Perl",
@@ -318,23 +479,19 @@
                   "Blog",
                   1
                ]
-            ],
-            "name" : "Stephen G. Lynn",
-            "id" : "Stephen G. Lynn"
+            ]
          },
          {
+            "name" : "Steven Wilson",
             "id" : "Steven Wilson",
             "data" : [
                [
                   "Perl",
                   1
                ]
-            ],
-            "name" : "Steven Wilson"
+            ]
          },
          {
-            "id" : "Thomas Kohler",
-            "name" : "Thomas Kohler",
             "data" : [
                [
                   "Perl",
@@ -344,10 +501,11 @@
                   "Blog",
                   2
                ]
-            ]
+            ],
+            "id" : "Thomas Kohler",
+            "name" : "Thomas Kohler"
          },
          {
-            "id" : "Ulrich Rieke",
             "data" : [
                [
                   "Perl",
@@ -358,11 +516,10 @@
                   1
                ]
             ],
+            "id" : "Ulrich Rieke",
             "name" : "Ulrich Rieke"
          },
          {
-            "id" : "W. Luis Mochan",
-            "name" : "W. Luis Mochan",
             "data" : [
                [
                   "Perl",
@@ -372,165 +529,31 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "name" : "W. Luis Mochan",
+            "id" : "W. Luis Mochan"
          }
       ]
    },
+   "subtitle" : {
+      "text" : "[Champions: 29] Last updated at 2023-05-29 03:18:17 GMT"
+   },
    "legend" : {
       "enabled" : 0
    },
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-         "colorByPoint" : 1,
-         "name" : "The Weekly Challenge - 218",
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-               "drilldown" : "Arne Sommer"
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-               "drilldown" : "Athanasius"
-            },
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-            },
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-               "drilldown" : "BarrOff"
-            },
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-               "drilldown" : "Bruce Gray"
-            },
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-               "name" : "Cheok-Yin Fung",
-               "y" : 2,
-               "drilldown" : "Cheok-Yin Fung"
-            },
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-               "drilldown" : "David Ferrone",
-               "name" : "David Ferrone",
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-               "y" : 1,
-               "drilldown" : "Jan Krnavek"
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-               "y" : 2,
-               "drilldown" : "Lubos Kolouch"
-            },
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-               "y" : 2,
-               "name" : "Mark Anderson",
-               "drilldown" : "Mark Anderson"
-            },
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-               "drilldown" : "Matthias Muth",
-               "y" : 3,
-               "name" : "Matthias Muth"
-            },
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-               "drilldown" : "Niels van Dijke",
-               "name" : "Niels van Dijke",
-               "y" : 2
-            },
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-               "drilldown" : "Paulo Custodio",
-               "y" : 2,
-               "name" : "Paulo Custodio"
-            },
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-               "name" : "Peter Campbell Smith",
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-               "drilldown" : "Robbie Hatley"
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-               "drilldown" : "Robert DiCicco"
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-               "drilldown" : "Robert Ransbottom"
-            },
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-               "drilldown" : "Roger Bell_West"
-            },
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-            },
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-               "name" : "Solathian",
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-               "name" : "Stephen G. Lynn",
-               "drilldown" : "Stephen G. Lynn"
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-               "y" : 3,
-               "drilldown" : "Ulrich Rieke"
-            },
-            {
-               "drilldown" : "W. Luis Mochan",
-               "y" : 3,
-               "name" : "W. Luis Mochan"
-            }
-         ]
+   "title" : {
+      "text" : "The Weekly Challenge - 218"
+   },
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-      "type" : "category"
    },
-   "subtitle" : {
-      "text" : "[Champions: 28] Last updated at 2023-05-28 23:08:58 GMT"
+   "chart" : {
+      "type" : "column"
    }
 }
diff --git a/stats/pwc-language-breakdown-summary.json b/stats/pwc-language-breakdown-summary.json
index 53aeb4affb..9c7235fbbf 100644
--- a/stats/pwc-language-breakdown-summary.json
+++ b/stats/pwc-language-breakdown-summary.json
@@ -1,63 +1,63 @@
 {
-   "title" : {
-      "text" : "The Weekly Challenge Contributions [2019 - 2023]"
-   },
-   "yAxis" : {
-      "min" : 0,
-      "title" : {
-         "text" : null
-      }
-   },
-   "chart" : {
-      "type" : "column"
-   },
-   "legend" : {
-      "enabled" : "false"
-   },
-   "tooltip" : {
-      "pointFormat" : "<b>{point.y:.0f}</b>"
-   },
-   "xAxis" : {
-      "type" : "category",
-      "labels" : {
-         "style" : {
-            "fontSize" : "13px",
-            "fontFamily" : "Verdana, sans-serif"
-         }
-      }
-   },
-   "subtitle" : {
-      "text" : "Last updated at 2023-05-28 23:08:58 GMT"
-   },
    "series" : [
       {
-         "dataLabels" : {
-            "enabled" : "true",
-            "format" : "{point.y:.0f}",
-            "align" : "right",
-            "style" : {
-               "fontFamily" : "Verdana, sans-serif",
-               "fontSize" : "13px"
-            },
-            "color" : "#FFFFFF",
-            "y" : 10,
-            "rotation" : -90
-         },
-         "name" : "Contributions",
          "data" : [
             [
                "Blog",
-               3609
+               3611
             ],
             [
                "Perl",
-               11150
+               11152
             ],
             [
                "Raku",
-               6439
+               6441
             ]
-         ]
+         ],
+         "dataLabels" : {
+            "color" : "#FFFFFF",
+            "rotation" : -90,
+            "format" : "{point.y:.0f}",
+            "y" : 10,
+            "align" : "right",
+            "style" : {
+               "fontFamily" : "Verdana, sans-serif",
+               "fontSize" : "13px"
+            },
+            "enabled" : "true"
+         },
+         "name" : "Contributions"
+      }
+   ],
+   "xAxis" : {
+      "type" : "category",
+      "labels" : {
+         "style" : {
+            "fontFamily" : "Verdana, sans-serif",
+            "fontSize" : "13px"
+         }
+      }
+   },
+   "yAxis" : {
+      "min" : 0,
+      "title" : {
+         "text" : null
       }
-   ]
+   },
+   "subtitle" : {
+      "text" : "Last updated at 2023-05-29 03:18:17 GMT"
+   },
+   "tooltip" : {
+      "pointFormat" : "<b>{point.y:.0f}</b>"
+   },
+   "title" : {
+      "text" : "The Weekly Challenge Contributions [2019 - 2023]"
+   },
+   "legend" : {
+      "enabled" : "false"
+   },
+   "chart" : {
+      "type" : "column"
+   }
 }
diff --git a/stats/pwc-language-breakdown.json b/stats/pwc-language-breakdown.json
index 905b5cc908..c1fab39ac2 100644
--- a/stats/pwc-language-breakdown.json
+++ b/stats/pwc-language-breakdown.json
@@ -1,1124 +1,30 @@
 {
-   "series" : [
-      {
-         "colorByPoint" : "true",
-         "data" : [
-            {
-               "y" : 163,
-               "name" : "#001",
-               "drilldown" : "001"
-            },
-            {
-               "y" : 129,
-               "name" : "#002",
-               "drilldown" : "002"
-            },
-            {
-               "name" : "#003",
-               "y" : 87,
-               "drilldown" : "003"
-            },
-            {
-               "name" : "#004",
-               "y" : 103,
-               "drilldown" : "004"
-            },
-            {
-               "drilldown" : "005",
-               "y" : 80,
-               "name" : "#005"
-            },
-            {
-               "drilldown" : "006",
-               "y" : 61,
-               "name" : "#006"
-            },
-            {
-               "drilldown" : "007",
-               "name" : "#007",
-               "y" : 69
-            },
-            {
-               "drilldown" : "008",
-               "y" : 82,
-               "name" : "#008"
-            },
-            {
-               "drilldown" : "009",
-               "name" : "#009",
-               "y" : 80
-            },
-            {
-               "name" : "#010",
-               "y" : 69,
-               "drilldown" : "010"
-            },
-            {
-               "name" : "#011",
-