- Added solutions by Laurent Rosenfeld.

19 files changed, 2390 insertions, 2288 deletions

diff --git a/challenge-175/laurent-rosenfeld/blog.txt b/challenge-175/laurent-rosenfeld/blog.txt
new file mode 100644
index 0000000000..238f36a155
--- /dev/null
+++ b/challenge-175/laurent-rosenfeld/blog.txt
@@ -0,0 +1 @@
+http://blogs.perl.org/users/laurent_r/2022/07/perl-weekly-challenge-175-last-sunday-and-perfect-totient-numbers.html
diff --git a/challenge-175/laurent-rosenfeld/perl/ch-1.pl b/challenge-175/laurent-rosenfeld/perl/ch-1.pl
new file mode 100644
index 0000000000..06c312f3de
--- /dev/null
+++ b/challenge-175/laurent-rosenfeld/perl/ch-1.pl
@@ -0,0 +1,23 @@
+#!/usr/bin/perl
+use strict;
+use warnings;
+use feature qw/say/;
+use Time::Local;
+
+my $yr = shift // 2022;
+my @months = (0, 31, is_leap($yr) ? 29 : 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31);
+
+for my $month (1..12) {
+    my $month_last_day = timegm( 0, 0, 0, $months[$month], $month - 1, $yr - 1900 );
+    my $day_in_week = (gmtime $month_last_day)[6];
+    my $sunday = $months[$month] - ($day_in_week % 7);
+    printf "%04d/%02d/%02d\n", $yr, $month, $sunday;
+}
+
+sub is_leap {
+    my $yr = shift;
+    return 0 if $yr % 4;    # no if not divisible by 4
+    return 1 if $yr % 100;  # yes if divisible by 4 but not by 100
+    return 0 if $yr % 400;  # no if divisible by 100 and not by 400
+    return 1;               # yes if divisibe by 400
+}
diff --git a/challenge-175/laurent-rosenfeld/perl/ch-2.pl b/challenge-175/laurent-rosenfeld/perl/ch-2.pl
new file mode 100644
index 0000000000..1d649e2371
--- /dev/null
+++ b/challenge-175/laurent-rosenfeld/perl/ch-2.pl
@@ -0,0 +1,29 @@
+# Unoptimized version, don't use it
+use strict;
+use warnings;
+use feature qw/say/;
+
+sub gcd {
+    my ($i, $j) = sort { $a <=> $b } @_;
+    while ($j) {
+        ($i, $j) = ($j, $i % $j);
+    }
+    return $i;
+}
+sub is_perfect_totient {
+    my $num = shift;
+    my $n = $num;
+    my $sum = 0;
+    while ($n >= 1) {
+        $n = scalar grep { gcd( $n, $_) == 1 } 1..$n-1;
+        $sum += $n;
+    }
+    return $num == $sum;
+}
+my $count = 0;
+my $n = 1;
+while ($count < 20) {
+    print "$n " and $count++ if is_perfect_totient $n;
+    $n++;
+}
+say "";
diff --git a/challenge-175/laurent-rosenfeld/raku/ch-1.raku b/challenge-175/laurent-rosenfeld/raku/ch-1.raku
new file mode 100644
index 0000000000..7bca863550
--- /dev/null
+++ b/challenge-175/laurent-rosenfeld/raku/ch-1.raku
@@ -0,0 +1,10 @@
+sub MAIN (Int $yr = 2022) {
+    for ('01'..'09', 10 .. 12).flat -> $month {
+        my $month-end = Date.new("$yr-$month-01").last-date-in-month;
+        my $week_day = $month-end.day-of-week;
+        my $day-in-month = $month-end.day-of-month;
+        # Note: Sunday is weekday 7
+        my $sunday = $day-in-month - ($week_day % 7);
+        say Date.new("$yr-$month-$sunday");
+    }
+}
diff --git a/challenge-175/laurent-rosenfeld/raku/ch-2.raku b/challenge-175/laurent-rosenfeld/raku/ch-2.raku
new file mode 100644
index 0000000000..7e99ac6ce0
--- /dev/null
+++ b/challenge-175/laurent-rosenfeld/raku/ch-2.raku
@@ -0,0 +1,16 @@
+# Unoptimized version, don't use it
+my $count = 0;
+for 2..Inf -> $n {
+    print "$n " and $count++ if is-perfect-totient $n;
+    last if $count >= 20;
+}
+say "";
+sub is-perfect-totient ($num) {
+    my $n = $num;
+    my $sum = 0;
+    while $n >= 1 {
+        $n = (grep { $n gcd $_ == 1 }, 1..^$n).elems;
+        $sum += $n;
+    }
+    return $num == $sum;
+}
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index b76cf4afe4..82a32caa04 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -1,112 +1,28 @@
 {
-   "series" : [
-      {
-         "colorByPoint" : 1,
-         "data" : [
-            {
-               "y" : 2,
-               "name" : "Dave Cross",
-               "drilldown" : "Dave Cross"
-            },
-            {
-               "drilldown" : "E. Choroba",
-               "name" : "E. Choroba",
-               "y" : 2
-            },
-            {
-               "drilldown" : "Flavio Poletti",
-               "name" : "Flavio Poletti",
-               "y" : 6
-            },
-            {
-               "name" : "Kjetil Skotheim",
-               "y" : 2,
-               "drilldown" : "Kjetil Skotheim"
-            },
-            {
-               "name" : "Luca Ferrari",
-               "y" : 8,
-               "drilldown" : "Luca Ferrari"
-            },
-            {
-               "name" : "Mark Anderson",
-               "y" : 2,
-               "drilldown" : "Mark Anderson"
-            },
-            {
-               "y" : 2,
-               "name" : "Mohammad S Anwar",
-               "drilldown" : "Mohammad S Anwar"
-            },
-            {
-               "name" : "Peter Campbell Smith",
-               "y" : 3,
-               "drilldown" : "Peter Campbell Smith"
-            },
-            {
-               "name" : "Robert DiCicco",
-               "y" : 2,
-               "drilldown" : "Robert DiCicco"
-            },
-            {
-               "name" : "Roger Bell_West",
-               "y" : 5,
-               "drilldown" : "Roger Bell_West"
-            },
-            {
-               "name" : "Simon Proctor",
-               "y" : 1,
-               "drilldown" : "Simon Proctor"
-            },
-            {
-               "y" : 5,
-               "name" : "Stephen G Lynn",
-               "drilldown" : "Stephen G Lynn"
-            },
-            {
-               "y" : 3,
-               "name" : "W. Luis Mochan",
-               "drilldown" : "W. Luis Mochan"
-            }
-         ],
-         "name" : "The Weekly Challenge - 175"
-      }
-   ],
-   "chart" : {
-      "type" : "column"
-   },
-   "plotOptions" : {
-      "series" : {
-         "borderWidth" : 0,
-         "dataLabels" : {
-            "format" : "{point.y}",
-            "enabled" : 1
-         }
-      }
-   },
    "drilldown" : {
       "series" : [
          {
             "id" : "Dave Cross",
+            "name" : "Dave Cross",
             "data" : [
                [
                   "Perl",
                   2
                ]
-            ],
-            "name" : "Dave Cross"
+            ]
          },
          {
-            "id" : "E. Choroba",
             "data" : [
                [
                   "Perl",
                   2
                ]
             ],
-            "name" : "E. Choroba"
+            "name" : "E. Choroba",
+            "id" : "E. Choroba"
          },
          {
+            "name" : "Flavio Poletti",
             "data" : [
                [
                   "Perl",
@@ -121,12 +37,11 @@
                   2
                ]
             ],
-            "id" : "Flavio Poletti",
-            "name" : "Flavio Poletti"
+            "id" : "Flavio Poletti"
          },
          {
-            "name" : "Kjetil Skotheim",
             "id" : "Kjetil Skotheim",
+            "name" : "Kjetil Skotheim",
             "data" : [
                [
                   "Perl",
@@ -135,6 +50,25 @@
             ]
          },
          {
+            "name" : "Laurent Rosenfeld",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "Laurent Rosenfeld"
+         },
+         {
+            "name" : "Luca Ferrari",
             "data" : [
                [
                   "Raku",
@@ -145,20 +79,21 @@
                   6
                ]
             ],
-            "id" : "Luca Ferrari",
-            "name" : "Luca Ferrari"
+            "id" : "Luca Ferrari"
          },
          {
             "name" : "Mark Anderson",
-            "id" : "Mark Anderson",
             "data" : [
                [
                   "Blog",
                   2
                ]
-            ]
+            ],
+            "id" : "Mark Anderson"
          },
          {
+            "id" : "Mohammad S Anwar",
+            "name" : "Mohammad S Anwar",
             "data" : [
                [
                   "Perl",
@@ -168,12 +103,9 @@
                   "Raku",
                   1
                ]
-            ],
-            "id" : "Mohammad S Anwar",
-            "name" : "Mohammad S Anwar"
+            ]
          },
          {
-            "id" : "Peter Campbell Smith",
             "data" : [
                [
                   "Perl",
@@ -184,7 +116,8 @@
                   1
                ]
             ],
-            "name" : "Peter Campbell Smith"
+            "name" : "Peter Campbell Smith",
+            "id" : "Peter Campbell Smith"
          },
          {
             "name" : "Robert DiCicco",
@@ -201,8 +134,8 @@
             "id" : "Robert DiCicco"
          },
          {
-            "name" : "Roger Bell_West",
             "id" : "Roger Bell_West",
+            "name" : "Roger Bell_West",
             "data" : [
                [
                   "Perl",
@@ -229,7 +162,7 @@
             "name" : "Simon Proctor"
          },
          {
-            "name" : "Stephen G Lynn",
+            "id" : "Stephen G Lynn",
             "data" : [
                [
                   "Perl",
@@ -244,9 +177,10 @@
                   1
                ]
             ],
-            "id" : "Stephen G Lynn"
+            "name" : "Stephen G Lynn"
          },
          {
+            "id" : "W. Luis Mochan",
             "name" : "W. Luis Mochan",
             "data" : [
                [
@@ -257,31 +191,120 @@
                   "Blog",
                   1
                ]
-            ],
-            "id" : "W. Luis Mochan"
+            ]
          }
       ]
    },
-   "subtitle" : {
-      "text" : "[Champions: 13] Last updated at 2022-07-27 10:49:08 GMT"
+   "plotOptions" : {
+      "series" : {
+         "borderWidth" : 0,
+         "dataLabels" : {
+            "format" : "{point.y}",
+            "enabled" : 1
+         }
+      }
    },
    "xAxis" : {
       "type" : "category"
    },
-   "legend" : {
-      "enabled" : 0
+   "title" : {
+      "text" : "The Weekly Challenge - 175"
    },
    "yAxis" : {
       "title" : {
          "text" : "Total Solutions"
       }
    },
+   "series" : [
+      {
+         "colorByPoint" : 1,
+         "name" : "The Weekly Challenge - 175",
+         "data" : [
+            {
+               "y" : 2,
+               "drilldown" : "Dave Cross",
+               "name" : "Dave Cross"
+            },
+            {
+               "y" : 2,
+               "name" : "E. Choroba",
+               "drilldown" : "E. Choroba"
+            },
+            {
+               "y" : 6,
+               "name" : "Flavio Poletti",
+               "drilldown" : "Flavio Poletti"
+            },
+            {
+               "drilldown" : "Kjetil Skotheim",
+               "name" : "Kjetil Skotheim",
+               "y" : 2
+            },
+            {
+               "y" : 5,
+               "drilldown" : "Laurent Rosenfeld",
+               "name" : "Laurent Rosenfeld"
+            },
+            {
+               "name" : "Luca Ferrari",
+               "drilldown" : "Luca Ferrari",
+               "y" : 8
+            },
+            {
+               "name" : "Mark Anderson",
+               "drilldown" : "Mark Anderson",
+               "y" : 2
+            },
+            {
+               "name" : "Mohammad S Anwar",
+               "drilldown" : "Mohammad S Anwar",
+               "y" : 2
+            },
+            {
+               "y" : 3,
+               "drilldown" : "Peter Campbell Smith",
+               "name" : "Peter Campbell Smith"
+            },
+            {
+               "y" : 2,
+               "name" : "Robert DiCicco",
+               "drilldown" : "Robert DiCicco"
+            },
+            {
+               "drilldown" : "Roger Bell_West",
+               "name" : "Roger Bell_West",
+               "y" : 5
+            },
+            {
+               "drilldown" : "Simon Proctor",
+               "name" : "Simon Proctor",
+               "y" : 1
+            },
+            {
+               "y" : 5,
+               "drilldown" : "Stephen G Lynn",
+               "name" : "Stephen G Lynn"
+            },
+            {
+               "y" : 3,
+               "name" : "W. Luis Mochan",
+               "drilldown" : "W. Luis Mochan"
+            }
+         ]
+      }
+   ],
    "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/>",
-      "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/>"
    },
-   "title" : {
-      "text" : "The Weekly Challenge - 175"
+   "subtitle" : {
+      "text" : "[Champions: 14] Last updated at 2022-07-27 20:00:08 GMT"
+   },
+   "legend" : {
+      "enabled" : 0
+   },
+   "chart" : {
+      "type" : "column"
    }
 }
diff --git a/stats/pwc-language-breakdown-summary.json b/stats/pwc-language-breakdown-summary.json
index ca452c6e23..e766c02d23 100644
--- a/stats/pwc-language-breakdown-summary.json
+++ b/stats/pwc-language-breakdown-summary.json
@@ -1,58 +1,58 @@
 {
-   "chart" : {
-      "type" : "column"
-   },
    "series" : [
       {
+         "dataLabels" : {
+            "style" : {
+               "fontFamily" : "Verdana, sans-serif",
+               "fontSize" : "13px"
+            },
+            "y" : 10,
+            "format" : "{point.y:.0f}",
+            "rotation" : -90,
+            "color" : "#FFFFFF",
+            "enabled" : "true",
+            "align" : "right"
+         },
+         "name" : "Contributions",
          "data" : [
             [
                "Blog",
-               2740
+               2741
             ],
             [
                "Perl",
-               8517
+               8519
             ],
             [
                "Raku",
-               5069
+               5071
             ]
-         ],
-         "dataLabels" : {
-            "style" : {
-               "fontFamily" : "Verdana, sans-serif",
-               "fontSize" : "13px"
-            },
-            "y" : 10,
-            "align" : "right",
-            "format" : "{point.y:.0f}",
-            "enabled" : "true",
-            "color" : "#FFFFFF",
-            "rotation" : -90
-         },
-         "name" : "Contributions"
+         ]
       }
    ],
-   "subtitle" : {
-      "text" : "Last updated at 2022-07-27 10:49:08 GMT"
-   },
    "tooltip" : {
       "pointFormat" : "<b>{point.y:.0f}</b>"
    },
-   "title" : {
-      "text" : "The Weekly Challenge Contributions [2019 - 2022]"
+   "subtitle" : {
+      "text" : "Last updated at 2022-07-27 20:00:08 GMT"
+   },
+   "legend" : {
+      "enabled" : "false"
+   },
+   "chart" : {
+      "type" : "column"
    },
    "xAxis" : {
       "type" : "category",
       "labels" : {
          "style" : {
-            "fontFamily" : "Verdana, sans-serif",
-            "fontSize" : "13px"
+            "fontSize" : "13px",
+            "fontFamily" : "Verdana, sans-serif"
          }
       }
    },
-   "legend" : {
-      "enabled" : "false"
+   "title" : {
+      "text" : "The Weekly Challenge Contributions [2019 - 2022]"
    },
    "yAxis" : {
       "title" : {
diff --git a/stats/pwc-language-breakdown.json b/stats/pwc-language-breakdown.json
index c216748aa8..6606bc8495 100644
--- a/stats/pwc-language-breakdown.json
+++ b/stats/pwc-language-breakdown.json
@@ -1,924 +1,9 @@
 {
-   "plotOptions" : {
-      "series" : {
-         "dataLabels" : {
-            "enabled" : 1,
-            "format" : "{point.y}"
-         },
-         "borderWidth" : 0
-      }
-   },
-   "chart" : {
-      "type" : "column"
-   },
-   "series" : [
-      {
-         "data" : [
-            {
-               "drilldown" : "001",
-               "y" : 161,
-               "name" : "#001"
-            },
-            {
-               "drilldown" : "002",
-               "y" : 125,
-               "name" : "#002"
-            },
-            {
-               "drilldown" : "003",
-               "y" : 83,
-               "name" : "#003"
-            },
-            {
-               "drilldown" : "004",
-               "y" : 99,
-               "name" : "#004"
-            },
-            {
-               "y" : 78,
-               "name" : "#005",
-               "drilldown" : "005"
-            },
-            {
-               "drilldown" : "006",
-               "name" : "#006",
-               "y" : 58
-            },
-            {
-               "drilldown" : "007",
-               "name" : "#007",
-               "y" : 65
-            },
-            {
-               "y" : 78,
-               "name" : "#008",
-               "drilldown" : "008"
-            },
-            {
-               "drilldown" : "009",
-               "y" : 76,
-               "name" : "#009"
-            },
-            {
-               "y" : 65,
-               "name" : "#010",
-               "drilldown" : "010"
-            },
-            {
-               "name" : "#011",
-               "y" : 85,
-               "drilldown" : "011"
-            },
-            {
-               "name" : "#012",
-               "y" : 89,
-               "drilldown" : "012"
-            },
-            {
-               "y" : 85,
-               "name" : "#013",
-               "drilldown" : "013"
-            },
-            {
-               "drilldown" : "014",
-               "name" : "#014",
-               "y" : 101
-            },
-            {
-               "drilldown" : "015",
-               "y" : 99,
-               "name" : "#015"
-            },
-            {
-               "drilldown" : "016",
-               "y" : 71,
-               "name" : "#016"
-            },
-            {
-               "y" : 84,
-               "name" : "#017",
-               "drilldown" : "017"
-            },
-            {
-               "name" : "#018",
-               "y" : 81,
-               "drilldown" : "018"
-            },
-            {
-               "name" : "#019",
-               "y" : 103,
-               "drilldown" : "019"
-            },
-            {
-               "drilldown" : "020",
-               "name" : "#020",
-               "y" : 101
-            },
-            {
-               "drilldown" : "021",
-               "y" : 72,
-               "name" : "#021"
-            },
-            {
-               "name" : "#022",
-               "y" : 68,
-               "drilldown" : "022"
-            },
-            {
-               "drilldown" : "023",
-               "y" : 97,
-               "name" : "#023"
-            },
-            {
-               "name" : "#024",
-               "y" : 75,
-               "drilldown" : "024"
-            },
-            {
-               "y" : 59,
-               "name" : "#025",
-               "drilldown" : "025"
-            },
-            {
-               "y" : 74,
-               "name" : "#026",
-               "drilldown" : "026"
-            },
-            {
-               "drilldown" : "027",
-               "name" : "#027",
-               "y" : 62
-            },
-            {
-               "drilldown" : "028",
-               "y" : 82,
-               "name" : "#028"
-            },
-            {
-               "y" : 81,
-               "name" : "#029",
-               "drilldown" : "029"
-            },
-            {
-               "name" : "#030",
-               "y" : 119,
-               "drilldown" : "030"
-            },
-            {
-               "drilldown" : "031",
-               "y" : 91,
-               "name" : "#031"
-            },
-            {
-               "y" : 96,
-               "name" : "#032",
-               "drilldown" : "032"
-            },
-            {
-               "name" : "#033",
-               "y" : 112,
-               "drilldown" : "033"
-            },
-            {
-               "drilldown" : "034",
-               "name" : "#034",
-               "y" : 66
-            },
-            {
-               "drilldown" : "035",
-               "y" : 66,
-               "name" : "#035"
-            },
-            {
-               "name" : "#036",
-               "y" : 70,
-               "drilldown" : "036"
-            },
-            {
-               "y" : 69,
-               "name" : "#037",
-               "drilldown" : "037"
-            },
-            {
-               "name" : "#038",
-               "y" : 70,
-               "drilldown" : "038"
-            },
-            {
-               "drilldown" : "039",
-               "name" : "#039",
-               "y" : 64
-            },
-            {
-               "drilldown" : "040",
-               "name" : "#040",
-               "y" : 75
-            },
-            {
-               "drilldown" : "041",
-               "name" : "#041",
-               "y" : 78
-            },
-            {
-               "drilldown" : "042",
-               "name" : "#042",
-               "y" : 94
-            },
-            {
-               "y" : 70,
-               "name" : "#043",
-               "drilldown" : "043"
-            },
-            {
-               "drilldown" : "044",
-               "y" : 87,
-               "name" : "#044"
-            },
-            {
-               "drilldown" : "045",
-               "y" : 98,
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-            },
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-            },
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-            },
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-            },
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-            },
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-            },
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-            },
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-            },
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-            },
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-            },
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-            },
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-            },
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-            },
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-            },
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-            },
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-            },
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-            },
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-            },
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-            },
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