- Added solutions by Laurent Rosenfeld.

19 files changed, 1582 insertions, 1475 deletions

diff --git a/challenge-136/laurent-rosenfeld/blog.txt b/challenge-136/laurent-rosenfeld/blog.txt
new file mode 100644
index 0000000000..7d9e2645f4
--- /dev/null
+++ b/challenge-136/laurent-rosenfeld/blog.txt
@@ -0,0 +1 @@
+http://blogs.perl.org/users/laurent_r/2021/10/perl-weekly-challenge-136-two-friendly-and-fibonacci-sequence.html
diff --git a/challenge-136/laurent-rosenfeld/perl/ch-1.pl b/challenge-136/laurent-rosenfeld/perl/ch-1.pl
new file mode 100644
index 0000000000..5baa93381d
--- /dev/null
+++ b/challenge-136/laurent-rosenfeld/perl/ch-1.pl
@@ -0,0 +1,21 @@
+use strict;
+use warnings;
+use feature "say";
+
+sub gcd {
+    my ($i, $j) = @_;
+    return 0 if $i < 1 or $j < 1;
+    while ($j) {
+        ($i, $j) = ($j, $i % $j);
+    }
+    return $i;
+}
+sub is_friendly {
+    my $gcd = gcd $_[0], $_[1];
+    return 0 if $gcd <= 1;
+    $gcd /= 2 while $gcd % 2 == 0;
+    return $gcd == 1 ? 1 : 0;
+}
+for my $pair ([8, 24], [26, 39], [4, 10], [7, 5], [18, 0]) {
+    say "@$pair => ", is_friendly @$pair;
+}
diff --git a/challenge-136/laurent-rosenfeld/perl/ch-2.pl b/challenge-136/laurent-rosenfeld/perl/ch-2.pl
new file mode 100644
index 0000000000..de524a364b
--- /dev/null
+++ b/challenge-136/laurent-rosenfeld/perl/ch-2.pl
@@ -0,0 +1,39 @@
+use strict;
+use warnings;
+use feature "say";
+use Data::Dumper;
+
+my @comb;
+my @fib = qw /1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597/;
+
+sub sum {
+    my $sum = 0;
+    $sum += $_ for @_;
+    return $sum;
+}
+
+sub combine {
+    my $target = shift;
+    my $count = shift;
+    my @out = @{$_[0]};
+    my @in  = @{$_[1]};
+    return if sum @out > $target;
+    push @comb, [@out] and return if sum(@out) == $target;
+    return if $count == 0;
+    for my $i (0..$#in) {
+        combine ($target, $count - 1, [@out, $in[$i]], [@in[$i+1..$#in]]);
+    }
+}
+
+
+sub fib_seq {
+    my $n = shift;
+    my @short_fib = grep { $_ <= $n } @fib;
+    my $count =  scalar @short_fib;
+    @comb = ();
+    combine $n, $count, [], [@short_fib];
+    say "@$_" for @comb;
+    return scalar @comb;
+}
+
+say "Number of sequences for $_: ", fib_seq $_ for 16, 9, 15, 89, 100;
diff --git a/challenge-136/laurent-rosenfeld/raku/ch-1.raku b/challenge-136/laurent-rosenfeld/raku/ch-1.raku
new file mode 100644
index 0000000000..aac4ddce18
--- /dev/null
+++ b/challenge-136/laurent-rosenfeld/raku/ch-1.raku
@@ -0,0 +1,11 @@
+use v6;
+
+sub is-friendly (Int $i, Int $j) {
+    my $gcd = $i gcd $j;
+    return 0 if $gcd <= 1;
+    $gcd /= 2 while $gcd %% 2;
+    return $gcd == 1 ?? 1 !! 0;
+}
+for 8, 24, 26, 39, 4, 10, 7, 5, 18, 0 {
+    say "$^a, $^b => ", is-friendly $^a, $^b;
+}
diff --git a/challenge-136/laurent-rosenfeld/raku/ch-2.raku b/challenge-136/laurent-rosenfeld/raku/ch-2.raku
new file mode 100644
index 0000000000..5067536a24
--- /dev/null
+++ b/challenge-136/laurent-rosenfeld/raku/ch-2.raku
@@ -0,0 +1,12 @@
+use v6;
+
+my @fib = 1, 2, * + * ... * > 1000; # 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597
+
+sub fib-seq (UInt $n) {
+    my $count = 0;
+    ++$count and .say for grep { $_.sum == $n }, @fib.grep({$_ <= $n }).combinations;
+    return $count;
+}
+for 16, 9, 15, 89, 100 {
+    say "Number of sequences for $_: ", fib-seq($_), "\n";
+}
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index 4736c6588b..8b918cd237 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -1,29 +1,97 @@
 {
-   "subtitle" : {
-      "text" : "[Champions: 10] Last updated at 2021-10-28 04:29:26 GMT"
+   "plotOptions" : {
+      "series" : {
+         "dataLabels" : {
+            "format" : "{point.y}",
+            "enabled" : 1
+         },
+         "borderWidth" : 0
+      }
    },
-   "title" : {
-      "text" : "The Weekly Challenge - 136"
+   "legend" : {
+      "enabled" : 0
    },
    "yAxis" : {
       "title" : {
          "text" : "Total Solutions"
       }
    },
-   "legend" : {
-      "enabled" : 0
-   },
-   "plotOptions" : {
-      "series" : {
-         "dataLabels" : {
-            "enabled" : 1,
-            "format" : "{point.y}"
-         },
-         "borderWidth" : 0
+   "series" : [
+      {
+         "name" : "The Weekly Challenge - 136",
+         "data" : [
+            {
+               "y" : 4,
+               "drilldown" : "Abigail",
+               "name" : "Abigail"
+            },
+            {
+               "y" : 6,
+               "drilldown" : "Flavio Poletti",
+               "name" : "Flavio Poletti"
+            },
+            {
+               "y" : 5,
+               "drilldown" : "Laurent Rosenfeld",
+               "name" : "Laurent Rosenfeld"
+            },
+            {
+               "y" : 4,
+               "name" : "Luca Ferrari",
+               "drilldown" : "Luca Ferrari"
+            },
+            {
+               "y" : 2,
+               "drilldown" : "Mark Anderson",
+               "name" : "Mark Anderson"
+            },
+            {
+               "y" : 2,
+               "name" : "Mohammad S Anwar",
+               "drilldown" : "Mohammad S Anwar"
+            },
+            {
+               "name" : "Paulo Custodio",
+               "drilldown" : "Paulo Custodio",
+               "y" : 2
+            },
+            {
+               "y" : 4,
+               "drilldown" : "Roger Bell_West",
+               "name" : "Roger Bell_West"
+            },
+            {
+               "name" : "Simon Proctor",
+               "drilldown" : "Simon Proctor",
+               "y" : 2
+            },
+            {
+               "y" : 4,
+               "name" : "Ulrich Rieke",
+               "drilldown" : "Ulrich Rieke"
+            },
+            {
+               "drilldown" : "W. Luis Mochan",
+               "name" : "W. Luis Mochan",
+               "y" : 3
+            }
+         ],
+         "colorByPoint" : 1
       }
+   ],
+   "chart" : {
+      "type" : "column"
    },
-   "xAxis" : {
-      "type" : "category"
+   "title" : {
+      "text" : "The Weekly Challenge - 136"
+   },
+   "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/>"
+   },
+   "subtitle" : {
+      "text" : "[Champions: 11] Last updated at 2021-10-28 04:37:15 GMT"
    },
    "drilldown" : {
       "series" : [
@@ -38,10 +106,11 @@
                   2
                ]
             ],
-            "name" : "Abigail",
-            "id" : "Abigail"
+            "id" : "Abigail",
+            "name" : "Abigail"
          },
          {
+            "id" : "Flavio Poletti",
             "data" : [
                [
                   "Perl",
@@ -56,8 +125,25 @@
                   2
                ]
             ],
-            "name" : "Flavio Poletti",
-            "id" : "Flavio Poletti"
+            "name" : "Flavio Poletti"
+         },
+         {
+            "id" : "Laurent Rosenfeld",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "name" : "Laurent Rosenfeld"
          },
          {
             "name" : "Luca Ferrari",
@@ -80,12 +166,11 @@
                   2
                ]
             ],
-            "name" : "Mark Anderson",
-            "id" : "Mark Anderson"
+            "id" : "Mark Anderson",
+            "name" : "Mark Anderson"
          },
          {
             "name" : "Mohammad S Anwar",
-            "id" : "Mohammad S Anwar",
             "data" : [
                [
                   "Perl",
@@ -95,7 +180,8 @@
                   "Raku",
                   1
                ]
-            ]
+            ],
+            "id" : "Mohammad S Anwar"
          },
          {
             "data" : [
@@ -104,11 +190,10 @@
                   2
                ]
             ],
-            "name" : "Paulo Custodio",
-            "id" : "Paulo Custodio"
+            "id" : "Paulo Custodio",
+            "name" : "Paulo Custodio"
          },
          {
-            "id" : "Roger Bell_West",
             "name" : "Roger Bell_West",
             "data" : [
                [
@@ -119,11 +204,12 @@
                   "Raku",
                   2
                ]
-            ]
+            ],
+            "id" : "Roger Bell_West"
          },
          {
-            "id" : "Simon Proctor",
             "name" : "Simon Proctor",
+            "id" : "Simon Proctor",
             "data" : [
                [
                   "Raku",
@@ -132,7 +218,6 @@
             ]
          },
          {
-            "name" : "Ulrich Rieke",
             "id" : "Ulrich Rieke",
             "data" : [
                [
@@ -143,11 +228,11 @@
                   "Raku",
                   2
                ]
-            ]
+            ],
+            "name" : "Ulrich Rieke"
          },
          {
             "id" : "W. Luis Mochan",
-            "name" : "W. Luis Mochan",
             "data" : [
                [
                   "Perl",
@@ -157,74 +242,12 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "name" : "W. Luis Mochan"
          }
       ]
    },
-   "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
-   },
-   "chart" : {
-      "type" : "column"
-   },
-   "series" : [
-      {
-         "colorByPoint" : 1,
-         "name" : "The Weekly Challenge - 136",
-         "data" : [
-            {
-               "drilldown" : "Abigail",
-               "y" : 4,
-               "name" : "Abigail"
-            },
-            {
-               "y" : 6,
-               "drilldown" : "Flavio Poletti",
-               "name" : "Flavio Poletti"
-            },
-            {
-               "y" : 4,
-               "drilldown" : "Luca Ferrari",
-               "name" : "Luca Ferrari"
-            },
-            {
-               "name" : "Mark Anderson",
-               "drilldown" : "Mark Anderson",
-               "y" : 2
-            },
-            {
-               "y" : 2,
-               "drilldown" : "Mohammad S Anwar",
-               "name" : "Mohammad S Anwar"
-            },
-            {
-               "drilldown" : "Paulo Custodio",
-               "y" : 2,
-               "name" : "Paulo Custodio"
-            },
-            {
-               "name" : "Roger Bell_West",
-               "y" : 4,
-               "drilldown" : "Roger Bell_West"
-            },
-            {
-               "drilldown" : "Simon Proctor",
-               "y" : 2,
-               "name" : "Simon Proctor"
-            },
-            {
-               "name" : "Ulrich Rieke",
-               "y" : 4,
-               "drilldown" : "Ulrich Rieke"
-            },
-            {
-               "drilldown" : "W. Luis Mochan",
-               "y" : 3,
-               "name" : "W. Luis Mochan"
-            }
-         ]
-      }
-   ]
+   "xAxis" : {
+      "type" : "category"
+   }
 }
diff --git a/stats/pwc-language-breakdown-summary.json b/stats/pwc-language-breakdown-summary.json
index 5a17e915f6..30f8d05e3b 100644
--- a/stats/pwc-language-breakdown-summary.json
+++ b/stats/pwc-language-breakdown-summary.json
@@ -1,31 +1,49 @@
 {
+   "xAxis" : {
+      "type" : "category",
+      "labels" : {
+         "style" : {
+            "fontSize" : "13px",
+            "fontFamily" : "Verdana, sans-serif"
+         }
+      }
+   },
+   "subtitle" : {
+      "text" : "Last updated at 2021-10-28 04:37:15 GMT"
+   },
+   "tooltip" : {
+      "pointFormat" : "<b>{point.y:.0f}</b>"
+   },
+   "title" : {
+      "text" : "The Weekly Challenge Contributions [2019 - 2021]"
+   },
    "series" : [
       {
          "data" : [
             [
                "Blog",
-               1966
+               1967
             ],
             [
                "Perl",
-               6491
+               6493
             ],
             [
                "Raku",
-               3954
+               3956
             ]
          ],
          "dataLabels" : {
-            "enabled" : "true",
             "rotation" : -90,
             "color" : "#FFFFFF",
-            "align" : "right",
             "format" : "{point.y:.0f}",
-            "y" : 10,
             "style" : {
                "fontFamily" : "Verdana, sans-serif",
                "fontSize" : "13px"
-            }
+            },
+            "enabled" : "true",
+            "align" : "right",
+            "y" : 10
          },
          "name" : "Contributions"
       }
@@ -33,29 +51,11 @@
    "chart" : {
       "type" : "column"
    },
-   "tooltip" : {
-      "pointFormat" : "<b>{point.y:.0f}</b>"
-   },
-   "xAxis" : {
-      "type" : "category",
-      "labels" : {
-         "style" : {
-            "fontSize" : "13px",
-            "fontFamily" : "Verdana, sans-serif"
-         }
-      }
-   },
    "yAxis" : {
-      "min" : 0,
       "title" : {
          "text" : null
-      }
-   },
-   "title" : {
-      "text" : "The Weekly Challenge Contributions [2019 - 2021]"
-   },
-   "subtitle" : {
-      "text" : "Last updated at 2021-10-28 04:29:26 GMT"
+      },
+      "min" : 0
    },
    "legend" : {
       "enabled" : "false"
diff --git a/stats/pwc-language-breakdown.json b/stats/pwc-language-breakdown.json
index 7f63f6a7fd..62d93886a7 100644
--- a/stats/pwc-language-breakdown.json
+++ b/stats/pwc-language-breakdown.json
@@ -1,7 +1,39 @@
 {
+   "yAxis" : {
+      "title" : {
+         "text" : "Total Solutions"
+      }
+   },
+   "plotOptions" : {
+      "series" : {
+         "borderWidth" : 0,
+         "dataLabels" : {
+            "enabled" : 1,
+            "format" : "{point.y}"
+         }
+      }
+   },
+   "legend" : {
+      "enabled" : "false"
+   },
+   "tooltip" : {
+      "followPointer" : "true",
+      "headerFormat" : "<span style=\"font-size:11px\"></span>",
+      "pointFormat" : "<span style=\"color:{point.color}\">Challenge {point.name}</span>: <b>{point.y:f}</b><br/>"
+   },
+   "title" : {
+      "text" : "The Weekly Challenge Language"
+   },
+   "subtitle" : {
+      "text" : "Click the columns to drilldown the language breakdown. Last updated at 2021-10-28 04:37:15 GMT"
+   },
+   "xAxis" : {
+      "type" : "category"
+   },
    "drilldown" : {
       "series" : [
          {
+            "id" : "001",
             "data" : [
                [
                   "Perl",
@@ -16,12 +48,10 @@
                   11
                ]
             ],
-            "name" : "001",
-            "id" : "001"
+            "name" : "001"
          },
          {
             "name" : "002",
-            "id" : "002",
             "data" : [
                [
                   "Perl",
@@ -35,11 +65,12 @@
                   "Blog",
                   10
                ]
-            ]
+            ],
+            "id" : "002"
          },
          {
-            "id" : "003",
             "name" : "003",
+            "id" : "003",
             "data" : [
                [
                   "Perl",
@@ -56,8 +87,6 @@
             ]
          },
          {
-            "id" : "004",
-            "name" : "004",
             "data" : [
                [
                   "Perl",
@@ -71,9 +100,12 @@
                   "Blog",
                   10
                ]
-            ]
+            ],
+            "id" : "004",
+            "name" : "004"
          },
          {
+            "id" : "005",
             "data" : [
                [
                   "Perl",
@@ -88,11 +120,9 @@
                   12
                ]
             ],
-            "id" : "005",
             "name" : "005"
          },
          {
-            "id" : "006",
             "name" : "006",
             "data" : [
                [
@@ -107,9 +137,11 @@
                   "Blog",
                   7
                ]
-            ]
+            ],
+            "id" : "006"
          },
          {
+            "id" : "007",
             "data" : [
                [
                   "Perl",
@@ -124,7 +156,6 @@
                   10
                ]
             ],
-            "id" : "007",
             "name" : "007"
          },
          {
@@ -146,6 +177,8 @@
             ]
          },
          {
+            "name" : "009",
+            "id" : "009",
             "data" : [
                [
                   "Perl",
@@ -159,13 +192,10 @@
                   "Blog",
                   13
                ]
-            ],
-            "name" : "009",
-            "id" : "009"
+            ]
          },
          {
             "id" : "010",
-            "name" : "010",
             "data" : [
                [
                   "Perl",
@@ -179,11 +209,11 @@
                   "Blog",
                   11
                ]
-            ]
+            ],
+            "name" : "010"
          },
          {
             "id" : "011",
-            "name" : "011",
             "data" : [
                [
                   "Perl",
@@ -197,7 +227,8 @@
                   "Blog",
                   10
                ]
-            ]
+            ],
+            "name" : "011"
          },
          {
             "name" : "012",
@@ -254,6 +285,8 @@
             "name" : "014"
          },
          {
+            "name" : "015",
+            "id" : "015",
             "data" : [
                [
                   "Perl",
@@ -267,13 +300,10 @@
                   "Blog",
                   15
                ]
-            ],
-            "id" : "015",
-            "name" : "015"
+            ]
          },
          {
             "name" : "016",
-            "id" : "016",
             "data" : [
                [
                   "Perl",
@@ -287,7 +317,8 @@
                   "Blog",
                   12
                ]
-            ]
+            ],
+            "id" : "016"
          },
          {
             "data" : [
@@ -326,6 +357,7 @@
             "name" : "018"
          },
          {
+            "name" : "019",
             "data" : [
                [
                   "Perl",
@@ -340,12 +372,11 @@
                   13
                ]
             ],
-            "id" : "019",
-            "name" : "019"
+            "id" : "019"
          },
          {
-            "id" : "020",
             "name" : "020",
+            "id" : "020",
             "data" : [
                [
                   "Perl",
@@ -362,7 +393,6 @@
             ]
          },
          {
-            "name" : "021",
             "id" : "021",
             "data" : [
                [
@@ -377,9 +407,11 @@
                   "Blog",
                   10
                ]
-            ]
+            ],
+            "name" : "021"
          },
          {
+            "id" : "022",
             "data" : [
                [
                   "Perl",
@@ -394,11 +426,9 @@
                   10
                ]
             ],
-            "id" : "022",
             "name" : "022"
          },
          {
-            "id" : "023",
             "name" : "023",
             "data" : [
                [
@@ -413,11 +443,10 @@
                   "Blog",
                   12
                ]
-            ]
+            ],
+            "id" : "023"
          },
          {
-            "name" : "024",
-            "id" : "024",
             "data" : [
                [
                   "Perl",
@@ -431,9 +460,12 @@
                   "Blog",
                   11
                ]
-            ]
+            ],
+            "id" : "024",
+            "name" : "024"
          },
          {
+            "name" : "025",
             "data" : [
                [
                   "Perl",
@@ -448,10 +480,11 @@
                   12
                ]
             ],
-            "name" : "025",
             "id" : "025"
          },
          {
+            "name" : "026",
+            "id" : "026",
             "data" : [
                [
                   "Perl",
@@ -465,11 +498,11 @@
                   "Blog",
                   10
                ]
-            ],
-            "id" : "026",
-            "name" : "026"
+            ]
          },
          {
+            "name" : "027",
+            "id" : "027",
             "data" : [
                [
                   "Perl",
@@ -483,11 +516,11 @@
                   "Blog",
                   9
                ]
-            ],
-            "name" : "027",
-            "id" : "027"
+            ]
          },
          {
+            "name" : "028",
+            "id" : "028",
             "data" : [
                [
                   "Perl",
@@ -501,12 +534,9 @@
                   "Blog",
                   9
                ]
-            ],
-            "id" : "028",
-            "name" : "028"
+            ]
          },
          {
-            "id" : "029",
             "name" : "029",
             "data" : [
                [
@@ -521,7 +551,8 @@
                   "Blog",
                   12
                ]
-            ]
+            ],
+            "id" : "029"
          },
          {
             "name" : "030",
@@ -542,8 +573,6 @@
             ]
          },
          {
-            "name" : "031",
-            "id" : "031",
             "data" : [
                [
                   "Perl",
@@ -557,7 +586,9 @@
                   "Blog",
                   9
                ]
-            ]
+            ],
+            "id" : "031",
+            "name" : "031"
          },
          {
             "name" : "032",
@@ -578,8 +609,6 @@
             ]
          },
          {
-            "id" : "033",
-            "name" : "033",
             "data" : [
                [
                   "Perl",
@@ -593,9 +622,13 @@
                   "Blog",
                   10
                ]
-            ]
+            ],
+            "id" : "033",
+            "name" : "033"
          },
          {
+            "name" : "034",
+            "id" : "034",
             "data" : [
                [
                   "Perl",
@@ -609,13 +642,9 @@
                   "Blog",
                   11
                ]
-            ],
-            "id" : "034",
-            "name" : "034"
+            ]
          },
          {
-            "id" : "035",
-            "name" : "035",
             "data" : [
                [
                   "Perl",
@@ -629,9 +658,12 @@
                   "Blog",
                   9
                ]
-            ]
+            ],
+            "id" : "035",
+            "name" : "035"
          },
          {
+            "id" : "036",
             "data" : [
                [
                   "Perl",
@@ -646,10 +678,10 @@
                   11
                ]
             ],
-            "id" : "036",
             "name" : "036"
          },
          {
+            "id" : "037",
             "data" : [
                [
                   "Perl",
@@ -664,10 +696,10 @@
                   9
                ]
             ],
-            "name" : "037",
-            "id" : "037"
+            "name" : "037"
          },
          {
+            "id" : "038",
             "data" : [
                [
                   "Perl",
@@ -682,10 +714,11 @@
                   12
                ]
             ],
-            "name" : "038",
-            "id" : "038"
+            "name" : "038"
          },
          {
+            "name" : "039",
+            "id" : "039",
             "data" : [
                [
                   "Perl",
@@ -699,12 +732,9 @@
                   "Blog",
                   12
                ]
-            ],
-            "id" : "039",
-            "name" : "039"
+            ]
          },
          {
-            "id" : "040",
             "name" : "040",
             "data" : [
                [
@@ -719,7 +749,8 @@
                   "Blog",
                   10
                ]
-            ]
+            ],
+            "id" : "040"
          },
          {
             "data" : [
@@ -740,6 +771,8 @@
             "name" : "041"
          },
          {
+            "name" : "042",
+            "id" : "042",
             "data" : [
                [
                   "Perl",
@@ -753,13 +786,9 @@
                   "Blog",
                   11
                ]
-            ],
-            "id" : "042",
-            "name" : "042"
+            ]
          },
          {
-            "id" : "043",
-            "name" : "043",
             "data" : [
                [
                   "Perl",
@@ -773,9 +802,12 @@
                   "Blog",
                   11
                ]
-            ]
+            ],
+            "id" : "043",
+            "name" : "043"
          },
          {
+            "id" : "044",
             "data" : [
                [
                   "Perl",
@@ -790,10 +822,10 @@
                   11
                ]
             ],
-            "id" : "044",
             "name" : "044"
          },
          {
+            "id" : "045",
             "data" : [
                [
                   "Perl",
@@ -808,10 +840,10 @@
                   11
                ]
             ],
-            "id" : "045",
             "name" : "045"
          },