- Added Perl solutions to the Challenge #070.

15 files changed, 1530 insertions, 1357 deletions

diff --git a/challenge-070/mohammad-anwar/perl/ch-1.pl b/challenge-070/mohammad-anwar/perl/ch-1.pl
new file mode 100755
index 0000000000..c425cf29ae
--- /dev/null
+++ b/challenge-070/mohammad-anwar/perl/ch-1.pl
@@ -0,0 +1,32 @@
+#!/usr/bin/perl
+
+#
+# Perl Weekly Challenge - 070
+#
+# Task #1: Character Swapping
+#
+# https://perlweeklychallenge.org/blog/perl-weekly-challenge-070
+#
+
+use strict;
+use warnings;
+
+my $S = $ARGV[0] || 'perlandraku';
+my $C = $ARGV[1] || 3;
+my $O = $ARGV[2] || 4;
+
+print sprintf("%s => %s\n", $S, swap($S, $C, $O));
+
+sub swap {
+    my ($string, $count, $offset) = @_;
+
+    my $length = length($string);
+    my @array  = split //, $string;
+    foreach my $i (1..$count) {
+        my $a = $i % $length;
+        my $b = ($i + $offset) % $length;
+        ($array[$a], $array[$b]) = ($array[$b], $array[$a]);
+    }
+
+    return join '', @array;
+}
diff --git a/challenge-070/mohammad-anwar/perl/ch-1a.pl b/challenge-070/mohammad-anwar/perl/ch-1a.pl
new file mode 100755
index 0000000000..a84a6d8078
--- /dev/null
+++ b/challenge-070/mohammad-anwar/perl/ch-1a.pl
@@ -0,0 +1,29 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use Test::More;
+
+is(swap('perlandraku', 3, 4),
+   'pndraerlaku',
+   'testing perlandraku.');
+is(swap('weeklychallenge', 5, 2),
+   'wklycheeallenge',
+   'testing weeklychallenge.');
+
+done_testing;
+
+sub swap {
+    my ($string, $count, $offset) = @_;
+
+    my $length = length($string);
+    my @array  = split //, $string;
+    foreach my $i (1..$count) {
+        my $a = $i % $length;
+        my $b = ($i + $offset) % $length;
+        ($array[$a], $array[$b]) = ($array[$b], $array[$a]);
+    }
+
+    return join '', @array;
+}
diff --git a/challenge-070/mohammad-anwar/perl/ch-2.pl b/challenge-070/mohammad-anwar/perl/ch-2.pl
new file mode 100755
index 0000000000..e18b5a9de6
--- /dev/null
+++ b/challenge-070/mohammad-anwar/perl/ch-2.pl
@@ -0,0 +1,45 @@
+#!/usr/bin/perl
+
+#
+# Perl Weekly Challenge - 070
+#
+# Task #2: Gray Code Sequence
+#
+# https://perlweeklychallenge.org/blog/perl-weekly-challenge-070
+#
+
+use strict;
+use warnings;
+
+my $N = $ARGV[0] || 3;
+
+print sprintf("%d-bit Gray Code Sequence:\n[%s]\n",
+              $N, join ', ', generate_gray_code_sequence($N));
+
+sub generate_gray_code_sequence {
+    my ($n) = @_;
+
+    my %S = (
+        2 => ['00', '01', '11', '10'],
+    );
+
+    foreach my $i (3 .. $n) {
+        my $S1 = $S{$i - 1};
+        my $S2 = [ reverse @$S1 ];
+        $_ = '0' . $_ foreach @$S1;
+        $_ = '1' . $_ foreach @$S2;
+        $S{$i} = [ @$S1, @$S2 ];
+    }
+
+    my @gray_codes = ();
+    push @gray_codes, bin2dec($_) foreach (@{$S{$n}});
+
+    return @gray_codes;
+}
+
+# Borrowed from Perl Cookbook
+# https://www.oreilly.com/library/view/perl-cookbook/1565922433/ch02s05.html
+
+sub bin2dec {
+    return unpack("N", pack("B32", substr("0" x 32 . shift, -32)));
+}
diff --git a/challenge-070/mohammad-anwar/perl/ch-2a.pl b/challenge-070/mohammad-anwar/perl/ch-2a.pl
new file mode 100755
index 0000000000..dcbb7654f8
--- /dev/null
+++ b/challenge-070/mohammad-anwar/perl/ch-2a.pl
@@ -0,0 +1,52 @@
+#!/usr/bin/perl
+
+#
+# Perl Weekly Challenge - 070
+#
+# Task #2: Gray Code Sequence
+#
+# https://perlweeklychallenge.org/blog/perl-weekly-challenge-070
+#
+
+use strict;
+use warnings;
+
+use Test::More;
+use Test::Deep;
+
+is_deeply( [ generate_gray_code_sequence(3) ],
+           [ 0, 1, 3, 2, 6, 7, 5, 4 ],
+           'testing 3-bit gray code sequence' );
+is_deeply( [ generate_gray_code_sequence(4) ],
+           [ 0, 1, 3, 2, 6, 7, 5, 4, 12, 13, 15, 14, 10, 11, 9, 8 ],
+           'testing 4-bit gray code sequence' );
+
+done_testing;
+
+sub generate_gray_code_sequence {
+    my ($n) = @_;
+
+    my %S = (
+        2 => ['00', '01', '11', '10'],
+    );
+
+    foreach my $i (3 .. $n) {
+        my $S1 = $S{$i - 1};
+        my $S2 = [ reverse @$S1 ];
+        $_ = '0' . $_ foreach @$S1;
+        $_ = '1' . $_ foreach @$S2;
+        $S{$i} = [ @$S1, @$S2 ];
+    }
+
+    my @gray_codes = ();
+    push @gray_codes, bin2dec($_) foreach (@{$S{$n}});
+
+    return @gray_codes;
+}
+
+# Borrowed from Perl Cookbook
+# https://www.oreilly.com/library/view/perl-cookbook/1565922433/ch02s05.html
+
+sub bin2dec {
+    return unpack("N", pack("B32", substr("0" x 32 . shift, -32)));
+}
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index dd2280d6bf..4528d8f1cb 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -1,16 +1,41 @@
 {
-   "plotOptions" : {
-      "series" : {
-         "borderWidth" : 0,
-         "dataLabels" : {
-            "format" : "{point.y}",
-            "enabled" : 1
-         }
+   "series" : [
+      {
+         "data" : [
+            {
+               "y" : 4,
+               "drilldown" : "Andrew Shitov",
+               "name" : "Andrew Shitov"
+            },
+            {
+               "y" : 5,
+               "name" : "Javier Luque",
+               "drilldown" : "Javier Luque"
+            },
+            {
+               "name" : "Mohammad S Anwar",
+               "drilldown" : "Mohammad S Anwar",
+               "y" : 2
+            },
+            {
+               "y" : 4,
+               "name" : "Roger Bell_West",
+               "drilldown" : "Roger Bell_West"
+            },
+            {
+               "y" : 3,
+               "drilldown" : "Simon Green",
+               "name" : "Simon Green"
+            }
+         ],
+         "colorByPoint" : 1,
+         "name" : "Perl Weekly Challenge - 070"
       }
-   },
+   ],
    "drilldown" : {
       "series" : [
          {
+            "name" : "Andrew Shitov",
             "data" : [
                [
                   "Raku",
@@ -21,11 +46,9 @@
                   2
                ]
             ],
-            "id" : "Andrew Shitov",
-            "name" : "Andrew Shitov"
+            "id" : "Andrew Shitov"
          },
          {
-            "id" : "Javier Luque",
             "name" : "Javier Luque",
             "data" : [
                [
@@ -40,11 +63,21 @@
                   "Blog",
                   1
                ]
+            ],
+            "id" : "Javier Luque"
+         },
+         {
+            "name" : "Mohammad S Anwar",
+            "id" : "Mohammad S Anwar",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
             ]
          },
          {
             "id" : "Roger Bell_West",
-            "name" : "Roger Bell_West",
             "data" : [
                [
                   "Perl",
@@ -54,7 +87,8 @@
                   "Raku",
                   2
                ]
-            ]
+            ],
+            "name" : "Roger Bell_West"
          },
          {
             "data" : [
@@ -72,57 +106,38 @@
          }
       ]
    },
-   "yAxis" : {
-      "title" : {
-         "text" : "Total Solutions"
-      }
+   "subtitle" : {
+      "text" : "[Champions: 5] Last updated at 2020-07-20 10:56:00 GMT"
    },
-   "legend" : {
-      "enabled" : 0
+   "xAxis" : {
+      "type" : "category"
+   },
+   "plotOptions" : {
+      "series" : {
+         "borderWidth" : 0,
+         "dataLabels" : {
+            "enabled" : 1,
+            "format" : "{point.y}"
+         }
+      }
    },
    "tooltip" : {
-      "followPointer" : 1,
       "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>",
-      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>"
-   },
-   "xAxis" : {
-      "type" : "category"
+      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>",
+      "followPointer" : 1
    },
-   "chart" : {
-      "type" : "column"
+   "legend" : {
+      "enabled" : 0
    },
-   "series" : [
-      {
-         "data" : [
-            {
-               "drilldown" : "Andrew Shitov",
-               "y" : 4,
-               "name" : "Andrew Shitov"
-            },
-            {
-               "drilldown" : "Javier Luque",
-               "name" : "Javier Luque",
-               "y" : 5
-            },
-            {
-               "drilldown" : "Roger Bell_West",
-               "name" : "Roger Bell_West",
-               "y" : 4
-            },
-            {
-               "y" : 3,
-               "name" : "Simon Green",
-               "drilldown" : "Simon Green"
-            }
-         ],
-         "name" : "Perl Weekly Challenge - 070",
-         "colorByPoint" : 1
+   "yAxis" : {
+      "title" : {
+         "text" : "Total Solutions"
       }
-   ],
-   "subtitle" : {
-      "text" : "[Champions: 4] Last updated at 2020-07-20 10:25:23 GMT"
    },
    "title" : {
       "text" : "Perl Weekly Challenge - 070"
+   },
+   "chart" : {
+      "type" : "column"
    }
 }
diff --git a/stats/pwc-language-breakdown-summary.json b/stats/pwc-language-breakdown-summary.json
index 97b4db7e2d..cda03e06f1 100644
--- a/stats/pwc-language-breakdown-summary.json
+++ b/stats/pwc-language-breakdown-summary.json
@@ -2,6 +2,33 @@
    "chart" : {
       "type" : "column"
    },
+   "title" : {
+      "text" : "Perl Weekly Challenge Contributions [2019 - 2020]"
+   },
+   "yAxis" : {
+      "min" : 0,
+      "title" : {
+         "text" : null
+      }
+   },
+   "legend" : {
+      "enabled" : "false"
+   },
+   "tooltip" : {
+      "pointFormat" : "<b>{point.y:.0f}</b>"
+   },
+   "xAxis" : {
+      "labels" : {
+         "style" : {
+            "fontSize" : "13px",
+            "fontFamily" : "Verdana, sans-serif"
+         }
+      },
+      "type" : "category"
+   },
+   "subtitle" : {
+      "text" : "Last updated at 2020-07-20 10:56:00 GMT"
+   },
    "series" : [
       {
          "data" : [
@@ -11,7 +38,7 @@
             ],
             [
                "Perl",
-               2865
+               2867
             ],
             [
                "Raku",
@@ -19,45 +46,18 @@
             ]
          ],
          "dataLabels" : {
-            "enabled" : "true",
-            "color" : "#FFFFFF",
+            "format" : "{point.y:.0f}",
+            "align" : "right",
+            "y" : 10,
             "style" : {
                "fontFamily" : "Verdana, sans-serif",
                "fontSize" : "13px"
             },
-            "y" : 10,
+            "color" : "#FFFFFF",
             "rotation" : -90,
-            "align" : "right",
-            "format" : "{point.y:.0f}"
+            "enabled" : "true"
          },
          "name" : "Contributions"
       }
-   ],
-   "title" : {
-      "text" : "Perl Weekly Challenge Contributions [2019 - 2020]"
-   },
-   "subtitle" : {
-      "text" : "Last updated at 2020-07-20 10:25:23 GMT"
-   },
-   "xAxis" : {
-      "type" : "category",
-      "labels" : {
-         "style" : {
-            "fontFamily" : "Verdana, sans-serif",
-            "fontSize" : "13px"
-         }
-      }
-   },
-   "tooltip" : {
-      "pointFormat" : "<b>{point.y:.0f}</b>"
-   },
-   "legend" : {
-      "enabled" : "false"
-   },
-   "yAxis" : {
-      "title" : {
-         "text" : null
-      },
-      "min" : 0
-   }
+   ]
 }
diff --git a/stats/pwc-language-breakdown.json b/stats/pwc-language-breakdown.json
index 18d00bb150..e316bf405f 100644
--- a/stats/pwc-language-breakdown.json
+++ b/stats/pwc-language-breakdown.json
@@ -1,391 +1,23 @@
 {
-   "tooltip" : {
-      "followPointer" : "true",
-      "pointFormat" : "<span style=\"color:{point.color}\">Challenge {point.name}</span>: <b>{point.y:f}</b><br/>",
-      "headerFormat" : "<span style=\"font-size:11px\"></span>"
+   "plotOptions" : {
+      "series" : {
+         "dataLabels" : {
+            "enabled" : 1,
+            "format" : "{point.y}"
+         },
+         "borderWidth" : 0
+      }
    },
    "xAxis" : {
       "type" : "category"
    },
-   "chart" : {
-      "type" : "column"
-   },
-   "series" : [
-      {
-         "colorByPoint" : "true",
-         "name" : "Perl Weekly Challenge Languages",
-         "data" : [
-            {
-               "drilldown" : "001",
-               "y" : 142,
-               "name" : "#001"
-            },
-            {
-               "drilldown" : "002",
-               "name" : "#002",
-               "y" : 109
-            },
-            {
-               "drilldown" : "003",
-               "name" : "#003",
-               "y" : 71
-            },
-            {
-               "drilldown" : "004",
-               "y" : 91,
-               "name" : "#004"
-            },
-            {
-               "y" : 72,
-               "name" : "#005",
-               "drilldown" : "005"
-            },
-            {
-               "drilldown" : "006",
-               "name" : "#006",
-               "y" : 52
-            },
-            {
-               "drilldown" : "007",
-               "name" : "#007",
-               "y" : 59
-            },
-            {
-               "drilldown" : "008",
-               "y" : 72,
-               "name" : "#008"
-            },
-            {
-               "drilldown" : "009",
-               "name" : "#009",
-               "y" : 68
-            },
-            {
-               "y" : 60,
-               "name" : "#010",
-               "drilldown" : "010"
-            },
-            {
-               "y" : 79,
-               "name" : "#011",
-               "drilldown" : "011"
-            },
-            {
-               "drilldown" : "012",
-               "name" : "#012",
-               "y" : 83
-            },
-            {
-               "drilldown" : "013",
-               "y" : 76,
-               "name" : "#013"
-            },
-            {
-               "name" : "#014",
-               "y" : 96,
-               "drilldown" : "014"
-            },
-            {
-               "name" : "#015",
-               "y" : 93,
-               "drilldown" : "015"
-            },
-            {
-               "name" : "#016",
-               "y" : 66,
-               "drilldown" : "016"
-            },
-            {
-               "y" : 79,
-               "name" : "#017",
-               "drilldown" : "017"
-            },
-            {
-               "y" : 76,
-               "name" : "#018",
-               "drilldown" : "018"
-            },
-            {
-               "drilldown" : "019",
-               "name" : "#019",
-               "y" : 97
-            },
-            {
-               "drilldown" : "020",
-               "name" : "#020",
-               "y" : 95
-            },
-            {
-               "y" : 67,
-               "name" : "#021",
-               "drilldown" : "021"
-            },
-            {
-               "name" : "#022",
-               "y" : 63,
-               "drilldown" : "022"
-            },
-            {
-               "drilldown" : "023",
-               "y" : 91,
-               "name" : "#023"
-            },
-            {
-               "y" : 70,
-               "name" : "#024",
-               "drilldown" : "024"
-            },
-            {
-               "drilldown" : "025",
-               "y" : 55,
-               "name" : "#025"
-            },
-            {
-               "name" : "#026",
-               "y" : 70,
-               "drilldown" : "026"
-            },
-            {
-               "drilldown" : "027",
-               "y" : 58,
-               "name" : "#027"
-            },
-            {
-               "drilldown" : "028",
-               "y" : 78,
-               "name" : "#028"
-            },
-            {
-               "y" : 77,
-               "name" : "#029",
-               "drilldown" : "029"
-            },
-            {
-               "name" : "#030",
-               "y" : 115,
-               "drilldown" : "030"
-            },
-            {
-               "name" : "#031",
-               "y" : 87,
-               "drilldown" : "031"
-            },
-            {
-               "drilldown" : "032",
-               "name" : "#032",
-               "y" : 92
-            },
-            {
-               "drilldown" : "033",
-               "y" : 108,
-               "name" : "#033"
-            },
-            {
-               "drilldown" : "034",
-               "y" : 62,
-               "name" : "#034"
-            },
-            {
-               "drilldown" : "035",
-               "name" : "#035",
-               "y" : 62
-            },
-            {
-               "drilldown" : "036",
-               "name" : "#036",
-               "y" : 66
-            },
-            {
-               "drilldown" : "037",
-               "y" : 65,
-               "name" : "#037"
-            },
-            {
-               "drilldown" : "038",
-               "y" : 65,
-               "name" : "#038"
-            },
-            {
-               "drilldown" : "039",
-               "name" : "#039",
-               "y" : 60
-            },
-            {
-               "drilldown" : "040",
-               "name" : "#040",
-               "y" : 71
-            },
-            {
-               "drilldown" : "041",
-               "name" : "#041",
-               "y" : 74
-            },
-            {
-               "y" : 88,
-               "name" : "#042",
-               "drilldown" : "042"
-            },
-            {
-               "y" : 66,
-               "name" : "#043",
-               "drilldown" : "043"
-            },
-            {
-               "y" : 82,
-               "name" : "#044",
-               "drilldown" : "044"
-            },
-            {
-               "name" : "#045",
-               "y" : 94,
-               "drilldown" : "045"
-            },
-            {
-               "drilldown" : "046",
-               "y" : 85,
-               "name" : "#046"
-            },
-            {
-               "y" : 82,
-               "name" : "#047",
-               "drilldown" : "047"
-            },
-            {
-               "drilldown" : "048",
-               "y" : 106,
-               "name" : "#048"
-            },
-            {
-               "y" : 85,
-               "name" : "#049",
-               "drilldown" : "049"
-            },
-            {
-               "name" : "#050",
-               "y" : 96,
-               "drilldown" : "050"
-            },
-            {
-               "drilldown" : "051",
-               "y" : 87,
-               "name" : "#051"
-            },
-            {
-               "name" : "#052",
-               "y" : 89,
-               "drilldown" : "052"
-            },
-            {
-               "name" : "#053",
-               "y" : 99,
-               "drilldown" : "053"
-            },
-            {
-               "drilldown" : "054",
-               "name" : "#054",
-               "y" : 101
-            },
-            {
-               "drilldown" : "055",
-               "name" : "#055",
-               "y" : 86
-            },
-            {
-               "y" : 93,
-               "name" : "#056",
-               "drilldown" : "056"
-            },
-            {
-               "name" : "#057",
-               "y" : 78,
-               "drilldown" : "057"
-            },
-            {
-               "drilldown" : "058",
-               "y" : 62,
-               "name" : "#058"
-            },
-            {
-               "drilldown" : "059",
-               "name" : "#059",
-               "y" : 82
-            },
-            {
-               "drilldown" : "060",
-               "name" : "#060",
-               "y" : 78
-            },
-            {
-               "drilldown" : "061",
-               "name" : "#061",
-               "y" : 79
-            },
-            {
-               "y" : 54,
-               "name" : "#062",
-               "drilldown" : "062"
-            },
-            {
-               "name" : "#063",
-               "y" : 87,
-               "drilldown" : "063"
-            },
-            {
-               "drilldown" : "064",
-               "name" : "#064",
-               "y" : 76
-            },
-            {
-               "y" : 71,
-               "name" : "#065",
-               "drilldown" : "065"
-            },
-            {
-               "drilldown" : "066",
-               "y" : 81,
-               "name" : "#066"
-            },
-            {
-               "name" : "#067",
-               "y" : 87,
-               "drilldown" : "067"
-            },
-            {
-               "drilldown" : "068",
-               "y" : 68,
-               "name" : "#068"
-            },
-            {
-               "y" : 78,
-               "name" : "#069",
-               "drilldown" : "069"
-            },
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-      "text" : "Click the columns to drilldown the language breakdown. Last updated at 2020-07-20 10:25:23 GMT"
-   },
-   "title" : {
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-   "plotOptions" : {
-      "series" : {
-         "borderWidth" : 0,
-         "dataLabels" : {
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-            "enabled" : 1
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+      "text" : "Click the columns to drilldown the language breakdown. Last updated at 2020-07-20 10:56:00 GMT"
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@@ -400,11 +32,9 @@
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@@ -419,7 +49,8 @@
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@@ -440,8 +71,8 @@
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@@ -458,7 +89,6 @@
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@@ -473,7 +103,8 @@
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@@ -490,10 +121,11 @@
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@@ -508,10 +140,10 @@
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@@ -526,8 +158,7 @@
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@@ -544,12 +175,12 @@
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@@ -566,8 +197,8 @@
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@@ -584,7 +215,6 @@
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@@ -599,7 +229,8 @@
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@@ -638,7 +269,6 @@
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@@ -653,9 +283,12 @@
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@@ -669,12 +302,9 @@
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@@ -689,9 +319,11 @@
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@@ -706,10 +338,10 @@
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@@ -724,8 +356,7 @@
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@@ -746,8 +377,6 @@
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@@ -761,9 +390,13 @@
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@@ -777,11 +410,10 @@
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@@ -796,8 +428,7 @@
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