- Added solutions by Luca Ferrari.

- Added solutions by E. Choroba.
- Added solutions by Jorg Sommrey.
- Added solutions by Steven Wilson.
- Added solutions by Peter Meszaros.
- Added solutions by Thomas Kohler.
- Added solutions by Peter Campbell Smith.
- Added solutions by Ali Moradi.
- Added solutions by Packy Anderson.
- Added solutions by Roger Bell_West.
- Added solutions by Reinier Maliepaard.

20 files changed, 3123 insertions, 2848 deletions

diff --git a/challenge-271/reinier-maliepaard/blog.txt b/challenge-271/reinier-maliepaard/blog.txt
new file mode 100644
index 0000000000..0dc037d66c
--- /dev/null
+++ b/challenge-271/reinier-maliepaard/blog.txt
@@ -0,0 +1 @@
+https://reiniermaliepaard.nl/perl/pwc/index.php?id=pwc271
diff --git a/challenge-271/reinier-maliepaard/perl/ch-1.pl b/challenge-271/reinier-maliepaard/perl/ch-1.pl
new file mode 100644
index 0000000000..b960eb32b3
--- /dev/null
+++ b/challenge-271/reinier-maliepaard/perl/ch-1.pl
@@ -0,0 +1,89 @@
+#!/usr/bin/perl
+use strict;
+use warnings;
+use Math::Matrix;
+
+sub row_max_ones {
+
+    my ($x) = @_;
+    # a boolean matrix is a matrix whose entries are either 0 or 1
+    if ( $x -> is_bool() ) {
+
+        # find() returns the location of each non-zero element in terms of $i and $j.
+        # e.g. (0, 0), (0, 2), (1, 0) and (2, 0) are the coordinates of value 1 in Example 4 below
+        my($i, $j) = $x -> find();
+
+        # count occurrences of each element and save into %count
+        my %count;
+
+        foreach my $elem (@$i) {
+            $count{$elem}++;
+        }
+
+        # alternatively: map { $count{$_}++ } @$i;
+
+        # iterate through the hash to find the maximum value
+        my ($max_value, $max_row) = (0, 0);
+
+        foreach my $row (sort keys(%count)) {
+
+            if ($count{$row} > $max_value) {
+                $max_value = $count{$row};
+                # assign $row to $max_row only if both $max_value and $row have become new values
+                $max_row = $row if ($max_value != 0 && $row != $max_row);
+            }
+        }
+
+        print("Row maximum ones: ", ($max_row + 1), "\n");
+
+    }
+    else {
+        print("Error: no valid matrix!\n");
+    }
+}
+
+# TESTS
+my $matrix;
+
+# Example 1
+$matrix = [ [0, 1],
+            [1, 0],
+          ];
+row_max_ones(Math::Matrix -> new($matrix)); # Output: 1
+
+# Example 2
+$matrix = [ [0, 0, 0],
+            [1, 0, 1],
+          ];
+row_max_ones(Math::Matrix -> new($matrix)); # Output: 2
+
+# Example 3
+$matrix = [ [0, 0],
+            [1, 1],
+            [0, 0],
+          ];
+row_max_ones(Math::Matrix -> new($matrix)); # Output: 2
+
+# own test cases
+my $x;
+
+# Example 4
+$x = Math::Matrix -> new([1, 0, 1],
+                         [1, 0, 0],
+                         [1, 0, 0]);
+
+row_max_ones($x); # Output: 1
+
+# Example 5
+$x = Math::Matrix -> new([1, 0, 0],
+                         [1, 0, 0],
+                         [1, 0, 1]);
+
+row_max_ones($x); # Output: 3
+
+# Example 6
+$x = Math::Matrix -> new([1, 0, 0],
+                         [1, 0, 1],
+                         [1, 0, 1]);
+
+row_max_ones($x); # Output: 2
diff --git a/challenge-271/reinier-maliepaard/perl/ch-2.pl b/challenge-271/reinier-maliepaard/perl/ch-2.pl
new file mode 100644
index 0000000000..0e8680010d
--- /dev/null
+++ b/challenge-271/reinier-maliepaard/perl/ch-2.pl
@@ -0,0 +1,29 @@
+#!/usr/bin/perl
+use strict;
+use warnings;
+
+# function to count the number of 1 bits in the binary representation
+sub count_ones {
+    return(my $count = sprintf("%b", @_) =~ tr/1//);
+}
+
+sub count_sort_1_bits {
+    my @numbers = @_;
+
+    # count the number of 1 bits for each number and save to %hash
+    my %hash;
+    foreach my $number (@numbers) {
+        my $ones_count = count_ones($number);
+        $hash{$number} = $ones_count;
+    }
+
+    # sort keys by their values in ascending order
+    my @sorted_keys_asc = sort { $hash{$a} <=> $hash{$b} } sort(keys %hash);
+
+    # join for the right output
+    print("(", join(", ", @sorted_keys_asc), ")\n");
+}
+
+# TESTS
+my @numbers = (0, 1, 2, 3, 4, 5, 6, 7, 8);
+count_sort_1_bits(@numbers); # Output: (0, 1, 2, 4, 8, 3, 5, 6, 7)
diff --git a/stats/pwc-challenge-270.json b/stats/pwc-challenge-270.json
index 1ab6e4b33b..7e3b62cf44 100644
--- a/stats/pwc-challenge-270.json
+++ b/stats/pwc-challenge-270.json
@@ -1,24 +1,197 @@
 {
-   "subtitle" : {
-      "text" : "[Champions: 30] Last updated at 2024-05-27 11:19:38 GMT"
+   "series" : [
+      {
+         "data" : [
+            {
+               "y" : 3,
+               "drilldown" : "Arne Sommer",
+               "name" : "Arne Sommer"
+            },
+            {
+               "y" : 4,
+               "drilldown" : "Athanasius",
+               "name" : "Athanasius"
+            },
+            {
+               "y" : 1,
+               "name" : "BarrOff",
+               "drilldown" : "BarrOff"
+            },
+            {
+               "y" : 2,
+               "name" : "Bob Lied",
+               "drilldown" : "Bob Lied"
+            },
+            {
+               "y" : 2,
+               "drilldown" : "Bruce Gray",
+               "name" : "Bruce Gray"
+            },
+            {
+               "drilldown" : "Dave Jacoby",
+               "name" : "Dave Jacoby",
+               "y" : 3
+            },
+            {
+               "name" : "David Ferrone",
+               "drilldown" : "David Ferrone",
+               "y" : 1
+            },
+            {
+               "drilldown" : "E. Choroba",
+               "name" : "E. Choroba",
+               "y" : 2
+            },
+            {
+               "name" : "Feng Chang",
+               "drilldown" : "Feng Chang",
+               "y" : 2
+            },
+            {
+               "y" : 1,
+               "drilldown" : "Jan Krnavek",
+               "name" : "Jan Krnavek"
+            },
+            {
+               "y" : 4,
+               "name" : "Jorg Sommrey",
+               "drilldown" : "Jorg Sommrey"
+            },
+            {
+               "y" : 1,
+               "drilldown" : "Lance Wicks",
+               "name" : "Lance Wicks"
+            },
+            {
+               "drilldown" : "Laurent Rosenfeld",
+               "name" : "Laurent Rosenfeld",
+               "y" : 3
+            },
+            {
+               "y" : 11,
+               "drilldown" : "Luca Ferrari",
+               "name" : "Luca Ferrari"
+            },
+            {
+               "drilldown" : "Mark Anderson",
+               "name" : "Mark Anderson",
+               "y" : 1
+            },
+            {
+               "y" : 1,
+               "drilldown" : "Matthew Neleigh",
+               "name" : "Matthew Neleigh"
+            },
+            {
+               "y" : 3,
+               "drilldown" : "Matthias Muth",
+               "name" : "Matthias Muth"
+            },
+            {
+               "y" : 2,
+               "drilldown" : "Nelo Tovar",
+               "name" : "Nelo Tovar"
+            },
+            {
+               "y" : 2,
+               "name" : "Niels van Dijke",
+               "drilldown" : "Niels van Dijke"
+            },
+            {
+               "name" : "Packy Anderson",
+               "drilldown" : "Packy Anderson",
+               "y" : 5
+            },
+            {
+               "y" : 3,
+               "name" : "Peter Campbell Smith",
+               "drilldown" : "Peter Campbell Smith"
+            },
+            {
+               "drilldown" : "Peter Meszaros",
+               "name" : "Peter Meszaros",
+               "y" : 2
+            },
+            {
+               "drilldown" : "Reinier Maliepaard",
+               "name" : "Reinier Maliepaard",
+               "y" : 4
+            },
+            {
+               "y" : 2,
+               "name" : "Robbie Hatley",
+               "drilldown" : "Robbie Hatley"
+            },
+            {
+               "drilldown" : "Robert Ransbottom",
+               "name" : "Robert Ransbottom",
+               "y" : 2
+            },
+            {
+               "y" : 5,
+               "drilldown" : "Roger Bell_West",
+               "name" : "Roger Bell_West"
+            },
+            {
+               "y" : 3,
+               "name" : "Simon Green",
+               "drilldown" : "Simon Green"
+            },
+            {
+               "y" : 4,
+               "name" : "Thomas Kohler",
+               "drilldown" : "Thomas Kohler"
+            },
+            {
+               "drilldown" : "Ulrich Rieke",
+               "name" : "Ulrich Rieke",
+               "y" : 4
+            },
+            {
+               "drilldown" : "W. Luis Mochan",
+               "name" : "W. Luis Mochan",
+               "y" : 3
+            }
+         ],
+         "colorByPoint" : 1,
+         "name" : "The Weekly Challenge - 270"
+      }
+   ],
+   "plotOptions" : {
+      "series" : {
+         "dataLabels" : {
+            "enabled" : 1,
+            "format" : "{point.y}"
+         },
+         "borderWidth" : 0
+      }
    },
-   "legend" : {
-      "enabled" : 0
+   "chart" : {
+      "type" : "column"
    },
    "xAxis" : {
       "type" : "category"
    },
+   "yAxis" : {
+      "title" : {
+         "text" : "Total Solutions"
+      }
+   },
    "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/>",
-      "followPointer" : 1
+      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>"
    },
-   "chart" : {
-      "type" : "column"
+   "legend" : {
+      "enabled" : 0
+   },
+   "title" : {
+      "text" : "The Weekly Challenge - 270"
    },
    "drilldown" : {
       "series" : [
          {
+            "id" : "Arne Sommer",
             "data" : [
                [
                   "Raku",
@@ -29,12 +202,11 @@
                   1
                ]
             ],
-            "name" : "Arne Sommer",
-            "id" : "Arne Sommer"
+            "name" : "Arne Sommer"
          },
          {
-            "id" : "Athanasius",
             "name" : "Athanasius",
+            "id" : "Athanasius",
             "data" : [
                [
                   "Perl",
@@ -58,17 +230,17 @@
          },
          {
             "id" : "Bob Lied",
-            "name" : "Bob Lied",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ]
+            ],
+            "name" : "Bob Lied"
          },
          {
-            "id" : "Bruce Gray",
             "name" : "Bruce Gray",
+            "id" : "Bruce Gray",
             "data" : [
                [
                   "Raku",
@@ -77,7 +249,6 @@
             ]
          },
          {
-            "id" : "Dave Jacoby",
             "data" : [
                [
                   "Perl",
@@ -88,11 +259,12 @@
                   1
                ]
             ],
+            "id" : "Dave Jacoby",
             "name" : "Dave Jacoby"
          },
          {
-            "id" : "David Ferrone",
             "name" : "David Ferrone",
+            "id" : "David Ferrone",
             "data" : [
                [
                   "Perl",
@@ -101,37 +273,37 @@
             ]
          },
          {
-            "name" : "E. Choroba",
             "data" : [
                [
                   "Perl",
                   2
                ]
             ],
-            "id" : "E. Choroba"
+            "id" : "E. Choroba",
+            "name" : "E. Choroba"
          },
          {
-            "id" : "Feng Chang",
             "name" : "Feng Chang",
             "data" : [
                [
                   "Raku",
                   2
                ]
-            ]
+            ],
+            "id" : "Feng Chang"
          },
          {
             "id" : "Jan Krnavek",
-            "name" : "Jan Krnavek",
             "data" : [
                [
                   "Raku",
                   1
                ]
-            ]
+            ],
+            "name" : "Jan Krnavek"
          },
          {
-            "name" : "Jorg Sommrey",
+            "id" : "Jorg Sommrey",
             "data" : [
                [
                   "Perl",
@@ -139,24 +311,23 @@
                ],
                [
                   "Blog",
-                  1
+                  2
                ]
             ],
-            "id" : "Jorg Sommrey"
+            "name" : "Jorg Sommrey"
          },
          {
-            "name" : "Lance Wicks",
             "data" : [
                [
                   "Perl",
                   1
                ]
             ],
-            "id" : "Lance Wicks"
+            "id" : "Lance Wicks",
+            "name" : "Lance Wicks"
          },
          {
             "id" : "Laurent Rosenfeld",
-            "name" : "Laurent Rosenfeld",
             "data" : [
                [
                   "Perl",
@@ -170,10 +341,11 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "name" : "Laurent Rosenfeld"
          },
          {
-            "name" : "Luca Ferrari",
+            "id" : "Luca Ferrari",
             "data" : [
                [
                   "Raku",
@@ -184,11 +356,11 @@
                   9
                ]
             ],
-            "id" : "Luca Ferrari"
+            "name" : "Luca Ferrari"
          },
          {
-            "id" : "Mark Anderson",
             "name" : "Mark Anderson",
+            "id" : "Mark Anderson",
             "data" : [
                [
                   "Raku",
@@ -197,13 +369,13 @@
             ]
          },
          {
+            "name" : "Matthew Neleigh",
             "data" : [
                [
                   "Perl",
                   1
                ]
             ],
-            "name" : "Matthew Neleigh",
             "id" : "Matthew Neleigh"
          },
          {
@@ -217,8 +389,8 @@
                   1
                ]
             ],
-            "name" : "Matthias Muth",
-            "id" : "Matthias Muth"
+            "id" : "Matthias Muth",
+            "name" : "Matthias Muth"
          },
          {
             "id" : "Nelo Tovar",
@@ -237,12 +409,12 @@
                   2
                ]
             ],
-            "name" : "Niels van Dijke",
-            "id" : "Niels van Dijke"
+            "id" : "Niels van Dijke",
+            "name" : "Niels van Dijke"
          },
          {
-            "id" : "Packy Anderson",
             "name" : "Packy Anderson",
+            "id" : "Packy Anderson",
             "data" : [
                [
                   "Perl",
@@ -259,8 +431,8 @@
             ]
          },
          {
-            "id" : "Peter Campbell Smith",
             "name" : "Peter Campbell Smith",
+            "id" : "Peter Campbell Smith",
             "data" : [
                [
                   "Perl",
@@ -274,15 +446,16 @@
          },
          {
             "name" : "Peter Meszaros",
+            "id" : "Peter Meszaros",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ],
-            "id" : "Peter Meszaros"
+            ]
          },
          {
+            "name" : "Reinier Maliepaard",
             "id" : "Reinier Maliepaard",
             "data" : [
                [
@@ -293,8 +466,7 @@
                   "Blog",
                   2
                ]
-            ],
-            "name" : "Reinier Maliepaard"
+            ]
          },
          {
             "name" : "Robbie Hatley",
@@ -311,16 +483,18 @@
             "id" : "Robbie Hatley"
          },
          {
+            "name" : "Robert Ransbottom",
             "id" : "Robert Ransbottom",
             "data" : [
                [
                   "Raku",
                   2
                ]
-            ],
-            "name" : "Robert Ransbottom"
+            ]
          },
          {
+            "name" : "Roger Bell_West",
+            "id" : "Roger Bell_West",
             "data" : [
                [
                   "Perl",
@@ -334,9 +508,7 @@
                   "Blog",
                   1
                ]
-            ],
-            "name" : "Roger Bell_West",
-            "id" : "Roger Bell_West"
+            ]
          },
          {
             "name" : "Simon Green",
@@ -368,6 +540,7 @@
          },
          {
             "name" : "Ulrich Rieke",
+            "id" : "Ulrich Rieke",
             "data" : [
                [
                   "Perl",
@@ -377,10 +550,11 @@
                   "Raku",
                   2
                ]
-            ],
-            "id" : "Ulrich Rieke"
+            ]
          },
          {
+            "name" : "W. Luis Mochan",
+            "id" : "W. Luis Mochan",
             "data" : [
                [
                   "Perl",
@@ -390,185 +564,11 @@
                   "Blog",
                   1
                ]
-            ],
-            "name" : "W. Luis Mochan",
-            "id" : "W. Luis Mochan"
+            ]
          }
       ]
    },
-   "title" : {
-      "text" : "The Weekly Challenge - 270"
-   },
-   "plotOptions" : {
-      "series" : {
-         "borderWidth" : 0,
-         "dataLabels" : {
-            "enabled" : 1,
-            "format" : "{point.y}"
-         }
-      }
-   },
-   "yAxis" : {
-      "title" : {
-         "text" : "Total Solutions"
-      }
-   },
-   "series" : [
-      {
-         "colorByPoint" : 1,
-         "name" : "The Weekly Challenge - 270",
-         "data" : [
-            {
-               "drilldown" : "Arne Sommer",
-               "y" : 3,
-               "name" : "Arne Sommer"
-            },
-            {
-               "y" : 4,
-               "drilldown" : "Athanasius",
-               "name" : "Athanasius"
-            },
-            {
-               "name" : "BarrOff",
-               "drilldown" : "BarrOff",
-               "y" : 1
-            },
-            {
-               "y" : 2,
-               "drilldown" : "Bob Lied",
-               "name" : "Bob Lied"
-            },
-            {
-               "name" : "Bruce Gray",
-               "drilldown" : "Bruce Gray",
-               "y" : 2
-            },
-            {
-               "name" : "Dave Jacoby",
-               "drilldown" : "Dave Jacoby",
-               "y" : 3
-            },
-            {
-               "name" : "David Ferrone",
-               "drilldown" : "David Ferrone",
-               "y" : 1
-            },
-            {
-               "name" : "E. Choroba",
-               "y" : 2,
-               "drilldown" : "E. Choroba"
-            },
-            {
-               "name" : "Feng Chang",
-               "y" : 2,
-               "drilldown" : "Feng Chang"
-            },
-            {
-               "name" : "Jan Krnavek",
-               "y" : 1,
-               "drilldown" : "Jan Krnavek"
-            },
-            {
-               "name" : "Jorg Sommrey",
-               "drilldown" : "Jorg Sommrey",
-               "y" : 3
-            },
-            {
-               "name" : "Lance Wicks",
-               "drilldown" : "Lance Wicks",
-               "y" : 1
-            },
-            {
-               "name" : "Laurent Rosenfeld",
-               "y" : 3,
-               "drilldown" : "Laurent Rosenfeld"
-            },
-            {
-               "drilldown" : "Luca Ferrari",
-               "y" : 11,
-               "name" : "Luca Ferrari"
-            },
-            {
-               "y" : 1,
-               "drilldown" : "Mark Anderson",
-               "name" : "Mark Anderson"
-            },
-            {
-               "name" : "Matthew Neleigh",
-               "y" : 1,
-               "drilldown" : "Matthew Neleigh"
-            },
-            {
-               "drilldown" : "Matthias Muth",
-               "y" : 3,
-               "name" : "Matthias Muth"
-            },
-            {
-               "drilldown" : "Nelo Tovar",
-               "y" : 2,
-               "name" : "Nelo Tovar"
-            },
-            {
-               "drilldown" : "Niels van Dijke",
-               "y" : 2,
-               "name" : "Niels van Dijke"
-            },
-            {
-               "name" : "Packy Anderson",
-               "y" : 5,
-               "drilldown" : "Packy Anderson"
-            },
-            {
-               "drilldown" : "Peter Campbell Smith",
-               "y" : 3,
-               "name" : "Peter Campbell Smith"
-            },
-            {
-               "name" : "Peter Meszaros",
-               "y" : 2,
-               "drilldown" : "Peter Meszaros"
-            },
-            {
-               "name" : "Reinier Maliepaard",
-               "y" : 4,
-               "drilldown" : "Reinier Maliepaard"
-            },
-            {
-               "name" : "Robbie Hatley",
-               "y" : 2,
-               "drilldown" : "Robbie Hatley"
-            },
-            {
-               "drilldown" : "Robert Ransbottom",
-               "y" : 2,
-               "name" : "Robert Ransbottom"
-            },
-            {
-               "y" : 5,
-               "drilldown" : "Roger Bell_West",
-               "name" : "Roger Bell_West"
-            },
-            {
-               "y" : 3,
-               "drilldown" : "Simon Green",
-               "name" : "Simon Green"
-            },
-            {
-               "name" : "Thomas Kohler",
-               "drilldown" : "Thomas Kohler",
-               "y" : 4
-            },
-            {
-               "name" : "Ulrich Rieke",
-               "drilldown" : "Ulrich Rieke",
-               "y" : 4
-            },
-            {
-               "drilldown" : "W. Luis Mochan",
-               "y" : 3,
-               "name" : "W. Luis Mochan"
-            }
-         ]
-      }
-   ]
+   "subtitle" : {
+      "text" : "[Champions: 30] Last updated at 2024-05-28 09:52:57 GMT"
+   }
 }
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index 242f5d4a03..0a79758f58 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -1,108 +1,264 @@
 {
-   "tooltip" : {
-      "followPointer" : 1,
-      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>",
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