- Added solutions by Feng Chang.

23 files changed, 3105 insertions, 3071 deletions

diff --git a/stats/pwc-challenge-001.json b/stats/pwc-challenge-001.json
index 75275242b1..ae60bbb7cb 100644
--- a/stats/pwc-challenge-001.json
+++ b/stats/pwc-challenge-001.json
@@ -1,32 +1,29 @@
 {
-   "subtitle" : {
-      "text" : "[Champions: 53] Last updated at 2019-06-25 19:14:12 GMT"
-   },
-   "tooltip" : {
-      "pointFormat" : "<span style='color:{point.color}'>{point.name}</span>: <b>{point.y:f}</b><br/>",
-      "followPointer" : 1,
-      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>"
-   },
    "plotOptions" : {
       "series" : {
-         "borderWidth" : 0,
          "dataLabels" : {
-            "format" : "{point.y}",
-            "enabled" : 1
-         }
+            "enabled" : 1,
+            "format" : "{point.y}"
+         },
+         "borderWidth" : 0
       }
    },
+   "subtitle" : {
+      "text" : "[Champions: 53] Last updated at 2019-06-26 16:42:38 GMT"
+   },
+   "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/>"
+   },
    "legend" : {
       "enabled" : 0
    },
-   "xAxis" : {
-      "type" : "category"
-   },
    "title" : {
       "text" : "Perl Weekly Challenge - 001"
    },
-   "chart" : {
-      "type" : "column"
+   "xAxis" : {
+      "type" : "category"
    },
    "yAxis" : {
       "title" : {
@@ -50,34 +47,34 @@
             "name" : "Adam Russell"
          },
          {
+            "name" : "Ailbhe Tweedie",
+            "id" : "Ailbhe Tweedie",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
-            ],
-            "id" : "Ailbhe Tweedie",
-            "name" : "Ailbhe Tweedie"
+            ]
          },
          {
-            "id" : "Alex Daniel",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
             ],
+            "id" : "Alex Daniel",
             "name" : "Alex Daniel"
          },
          {
             "name" : "Andrezgz",
+            "id" : "Andrezgz",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ],
-            "id" : "Andrezgz"
+            ]
          },
          {
             "name" : "Antonio Gamiz",
@@ -90,13 +87,13 @@
             ]
          },
          {
-            "id" : "Arpad Toth",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
+            "id" : "Arpad Toth",
             "name" : "Arpad Toth"
          },
          {
@@ -111,26 +108,25 @@
          },
          {
             "name" : "Bob Kleemann",
-            "id" : "Bob Kleemann",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ]
+            ],
+            "id" : "Bob Kleemann"
          },
          {
+            "name" : "Daniel Mantovani",
             "id" : "Daniel Mantovani",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
-            ],
-            "name" : "Daniel Mantovani"
+            ]
          },
          {
-            "id" : "Dave Cross",
             "data" : [
                [
                   "Perl 5",
@@ -141,9 +137,12 @@
                   1
                ]
             ],
+            "id" : "Dave Cross",
             "name" : "Dave Cross"
          },
          {
+            "name" : "Dave Jacoby",
+            "id" : "Dave Jacoby",
             "data" : [
                [
                   "Perl 5",
@@ -153,9 +152,7 @@
                   "Blog",
                   1
                ]
-            ],
-            "id" : "Dave Jacoby",
-            "name" : "Dave Jacoby"
+            ]
          },
          {
             "id" : "David Kayal",
@@ -169,15 +166,17 @@
          },
          {
             "name" : "Doug Schrag",
+            "id" : "Doug Schrag",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
-            ],
-            "id" : "Doug Schrag"
+            ]
          },
          {
+            "name" : "Dr James A. Smith",
+            "id" : "Dr James A. Smith",
             "data" : [
                [
                   "Perl 5",
@@ -187,18 +186,16 @@
                   "Perl 6",
                   2
                ]
-            ],
-            "id" : "Dr James A. Smith",
-            "name" : "Dr James A. Smith"
+            ]
          },
          {
+            "id" : "Duncan C. White",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "id" : "Duncan C. White",
             "name" : "Duncan C. White"
          },
          {
@@ -212,14 +209,14 @@
             "name" : "Eddy HS"
          },
          {
+            "name" : "Finley",
+            "id" : "Finley",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
-            ],
-            "id" : "Finley",
-            "name" : "Finley"
+            ]
          },
          {
             "id" : "Fred Zinn",
@@ -232,24 +229,24 @@
             "name" : "Fred Zinn"
          },
          {
-            "id" : "Freddie B",
+            "name" : "Freddie B",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "name" : "Freddie B"
+            "id" : "Freddie B"
          },
          {
             "name" : "Gustavo Chaves",
+            "id" : "Gustavo Chaves",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
-            ],
-            "id" : "Gustavo Chaves"
+            ]
          },
          {
             "id" : "JJ Merelo",
@@ -266,7 +263,6 @@
             "name" : "JJ Merelo"
          },
          {
-            "name" : "Jaldhar H. Vyas",
             "id" : "Jaldhar H. Vyas",
             "data" : [
                [
@@ -277,19 +273,21 @@
                   "Perl 6",
                   2
                ]
-            ]
+            ],
+            "name" : "Jaldhar H. Vyas"
          },
          {
             "name" : "Jeff",
+            "id" : "Jeff",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ],
-            "id" : "Jeff"
+            ]
          },
          {
+            "id" : "Jeremy Carman",
             "data" : [
                [
                   "Perl 5",
@@ -300,18 +298,17 @@
                   1
                ]
             ],
-            "id" : "Jeremy Carman",
             "name" : "Jeremy Carman"
          },
          {
-            "id" : "Jim Bacon",
+            "name" : "Jim Bacon",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
             ],
-            "name" : "Jim Bacon"
+            "id" : "Jim Bacon"
          },
          {
             "data" : [
@@ -332,7 +329,6 @@
             "name" : "Jo Christian Oterhals"
          },
          {
-            "name" : "Joelle Maslak",
             "id" : "Joelle Maslak",
             "data" : [
                [
@@ -343,7 +339,8 @@
                   "Perl 6",
                   2
                ]
-            ]
+            ],
+            "name" : "Joelle Maslak"
          },
          {
             "name" : "John Barrett",
@@ -356,28 +353,27 @@
             ]
          },
          {
+            "name" : "Juan Caballero",
+            "id" : "Juan Caballero",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ],
-            "id" : "Juan Caballero",
-            "name" : "Juan Caballero"
+            ]
          },
          {
             "name" : "Khalid",
-            "id" : "Khalid",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ]
+            ],
+            "id" : "Khalid"
          },
          {
             "name" : "Kian-Meng Ang",
-            "id" : "Kian-Meng Ang",
             "data" : [
                [
                   "Perl 5",
@@ -387,17 +383,18 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "id" : "Kian-Meng Ang"
          },
          {
-            "name" : "Kivanc Yazan",
+            "id" : "Kivanc Yazan",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "id" : "Kivanc Yazan"
+            "name" : "Kivanc Yazan"
          },
          {
             "id" : "Lars Balker",
@@ -414,8 +411,6 @@
             "name" : "Lars Balker"
          },
          {
-            "name" : "Laurent Rosenfeld",
-            "id" : "Laurent Rosenfeld",
             "data" : [
                [
                   "Perl 5",
@@ -429,27 +424,29 @@
                   "Blog",
                   1
                ]
-            ]
+            ],
+            "id" : "Laurent Rosenfeld",
+            "name" : "Laurent Rosenfeld"
          },
          {
-            "name" : "Mark Senn",
             "id" : "Mark Senn",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
-            ]
+            ],
+            "name" : "Mark Senn"
          },
          {
             "name" : "Martin Mugeni",
-            "id" : "Martin Mugeni",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
-            ]
+            ],
+            "id" : "Martin Mugeni"
          },
          {
             "id" : "Neil Bowers",
@@ -463,6 +460,7 @@
          },
          {
             "name" : "Nick Logan",
+            "id" : "Nick Logan",
             "data" : [
                [
                   "Perl 5",
@@ -472,8 +470,7 @@
                   "Perl 6",
                   2
                ]
-            ],
-            "id" : "Nick Logan"
+            ]
          },
          {
             "id" : "Oleksii Tsvietnov",
@@ -486,34 +483,34 @@
             "name" : "Oleksii Tsvietnov"
          },
          {
-            "name" : "Ozzy",
+            "id" : "Ozzy",
             "data" : [
                [
                   "Perl 6",
                   2
                ]
             ],
-            "id" : "Ozzy"
+            "name" : "Ozzy"
          },
          {
+            "id" : "Pavel Jurca",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "id" : "Pavel Jurca",
             "name" : "Pavel Jurca"
          },
          {
+            "name" : "Pete Houston",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "id" : "Pete Houston",
-            "name" : "Pete Houston"
+            "id" : "Pete Houston"
          },
          {
             "name" : "Philippe Bruhat",
@@ -550,8 +547,6 @@
             "id" : "Sean Meininger"
          },
          {
-            "name" : "Simon Proctor",
-            "id" : "Simon Proctor",
             "data" : [
                [
                   "Perl 5",
@@ -565,20 +560,23 @@
                   "Blog",
                   2
                ]
-            ]
+            ],
+            "id" : "Simon Proctor",
+            "name" : "Simon Proctor"
          },
          {
+            "name" : "Simon Reinhardt",
+            "id" : "Simon Reinhardt",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ],
-            "id" : "Simon Reinhardt",
-            "name" : "Simon Reinhardt"
+            ]
          },
          {
             "name" : "Steve Rogerson",
+            "id" : "Steve Rogerson",
             "data" : [
                [
                   "Perl 5",
@@ -588,65 +586,62 @@
                   "Perl 6",
                   2
                ]
-            ],
-            "id" : "Steve Rogerson"
+            ]
          },
          {
+            "name" : "Steven Wilson",
             "id" : "Steven Wilson",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
-            ],
-            "name" : "Steven Wilson"
+            ]
          },
          {
-            "name" : "Tiago Stock",
+            "id" : "Tiago Stock",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
             ],
-            "id" : "Tiago Stock"
+            "name" : "Tiago Stock"
          },
          {
+            "id" : "Tore Andersson",
             "data" : [
                [
                   "Perl 5",
                   2
                ]
             ],
-            "id" : "Tore Andersson",
             "name" : "Tore Andersson"
          },
          {
-            "id" : "Veesh Goldman",
+            "name" : "Veesh Goldman",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
             ],
-            "name" : "Veesh Goldman"
+            "id" : "Veesh Goldman"
          },
          {
+            "name" : "William Gilmore",
             "id" : "William Gilmore",
             "data" : [
                [
                   "Perl 5",
                   1
                ]
-            ],
-            "name" : "William Gilmore"
+            ]
          }
       ]
    },
    "series" : [
       {
-         "colorByPoint" : 1,
-         "name" : "Perl Weekly Challenge - 001",
          "data" : [
             {
                "drilldown" : "Adam Russell",
@@ -654,44 +649,44 @@
                "name" : "Adam Russell"
             },
             {
-               "y" : 1,
+               "drilldown" : "Ailbhe Tweedie",
                "name" : "Ailbhe Tweedie",
-               "drilldown" : "Ailbhe Tweedie"
+               "y" : 1
             },
             {
+               "drilldown" : "Alex Daniel",
                "y" : 2,
-               "name" : "Alex Daniel",
-               "drilldown" : "Alex Daniel"
+               "name" : "Alex Daniel"
             },
             {
-               "name" : "Andrezgz",
+               "drilldown" : "Andrezgz",
                "y" : 2,
-               "drilldown" : "Andrezgz"
+               "name" : "Andrezgz"
             },
             {
-               "name" : "Antonio Gamiz",
+               "drilldown" : "Antonio Gamiz",
                "y" : 2,
-               "drilldown" : "Antonio Gamiz"
+               "name" : "Antonio Gamiz"
             },
             {
+               "drilldown" : "Arpad Toth",
                "name" : "Arpad Toth",
-               "y" : 2,
-               "drilldown" : "Arpad Toth"
+               "y" : 2
             },
             {
-               "y" : 2,
+               "drilldown" : "Athanasius",
                "name" : "Athanasius",
-               "drilldown" : "Athanasius"
+               "y" : 2
             },
             {
-               "drilldown" : "Bob Kleemann",
                "y" : 2,
-               "name" : "Bob Kleemann"
+               "name" : "Bob Kleemann",
+               "drilldown" : "Bob Kleemann"
             },
             {
                "drilldown" : "Daniel Mantovani",
-               "name" : "Daniel Mantovani",
-               "y" : 1
+               "y" : 1,
+               "name" : "Daniel Mantovani"
             },
             {
                "y" : 3,
@@ -704,19 +699,19 @@
                "y" : 2
             },
             {
-               "y" : 2,
+               "drilldown" : "David Kayal",
                "name" : "David Kayal",
-               "drilldown" : "David Kayal"
+               "y" : 2
             },
             {
+               "drilldown" : "Doug Schrag",
                "name" : "Doug Schrag",
-               "y" : 2,
-               "drilldown" : "Doug Schrag"
+               "y" : 2
             },
             {
-               "drilldown" : "Dr James A. Smith",
+               "y" : 4,
                "name" : "Dr James A. Smith",
-               "y" : 4
+               "drilldown" : "Dr James A. Smith"
             },
             {
                "drilldown" : "Duncan C. White",
@@ -724,8 +719,8 @@
                "y" : 2
             },
             {
-               "name" : "Eddy HS",
                "y" : 2,
+               "name" : "Eddy HS",
                "drilldown" : "Eddy HS"
             },
             {
@@ -739,24 +734,24 @@
                "drilldown" : "Fred Zinn"
             },
             {
-               "drilldown" : "Freddie B",
                "name" : "Freddie B",
-               "y" : 2
+               "y" : 2,
+               "drilldown" : "Freddie B"
             },
             {
+               "drilldown" : "Gustavo Chaves",
                "y" : 1,
-               "name" : "Gustavo Chaves",
-               "drilldown" : "Gustavo Chaves"
+               "name" : "Gustavo Chaves"
             },
             {
-               "y" : 2,
                "name" : "JJ Merelo",
+               "y" : 2,
                "drilldown" : "JJ Merelo"
             },
             {
+               "drilldown" : "Jaldhar H. Vyas",
                "name" : "Jaldhar H. Vyas",
-               "y" : 4,
-               "drilldown" : "Jaldhar H. Vyas"
+               "y" : 4
             },
             {
                "y" : 2,
@@ -769,34 +764,34 @@
                "drilldown" : "Jeremy Carman"
             },
             {
-               "drilldown" : "Jim Bacon",
                "y" : 1,
-               "name" : "Jim Bacon"
+               "name" : "Jim Bacon",
+               "drilldown" : "Jim Bacon"
             },
             {
-               "y" : 5,
                "name" : "Jo Christian Oterhals",
+               "y" : 5,
                "drilldown" : "Jo Christian Oterhals"
             },
             {
-               "drilldown" : "Joelle Maslak",
+               "y" : 4,
                "name" : "Joelle Maslak",
-               "y" : 4
+               "drilldown" : "Joelle Maslak"
             },
             {
-               "drilldown" : "John Barrett",
                "y" : 1,
-               "name" : "John Barrett"
+               "name" : "John Barrett",
+               "drilldown" : "John Barrett"
             },
             {
-               "drilldown" : "Juan Caballero",
+               "y" : 2,
                "name" : "Juan Caballero",
-               "y" : 2
+               "drilldown" : "Juan Caballero"
             },
             {
-               "drilldown" : "Khalid",
                "y" : 2,
-               "name" : "Khalid"
+               "name" : "Khalid",
+               "drilldown" : "Khalid"
             },
             {
                "drilldown" : "Kian-Meng Ang",
@@ -804,14 +799,14 @@
                "name" : "Kian-Meng Ang"
             },
             {
-               "name" : "Kivanc Yazan",
                "y" : 2,
+               "name" : "Kivanc Yazan",
                "drilldown" : "Kivanc Yazan"
             },
             {
-               "y" : 4,
+               "drilldown" : "Lars Balker",
                "name" : "Lars Balker",
-               "drilldown" : "Lars Balker"
+               "y" : 4
             },
             {
                "drilldown" : "Laurent Rosenfeld",
@@ -824,9 +819,9 @@
                "name" : "Mark Senn"
             },
             {
-               "drilldown" : "Martin Mugeni",
+               "y" : 2,
                "name" : "Martin Mugeni",
-               "y" : 2
+               "drilldown" : "Martin Mugeni"
             },
             {
                "drilldown" : "Neil Bowers",
@@ -834,44 +829,44 @@
                "y" : 1
             },
             {
-               "y" : 4,
+               "drilldown" : "Nick Logan",
                "name" : "Nick Logan",
-               "drilldown" : "Nick Logan"
+               "y" : 4
             },
             {
-               "drilldown" : "Oleksii Tsvietnov",
                "name" : "Oleksii Tsvietnov",
-               "y" : 2
+               "y" : 2,
+               "drilldown" : "Oleksii Tsvietnov"
             },
             {
-               "y" : 2,
+               "drilldown" : "Ozzy",
                "name" : "Ozzy",
-               "drilldown" : "Ozzy"
+               "y" : 2
             },
             {
+               "drilldown" : "Pavel Jurca",
                "y" : 2,
-               "name" : "Pavel Jurca",
-               "drilldown" : "Pavel Jurca"
+               "name" : "Pavel Jurca"
             },
             {
+               "drilldown" : "Pete Houston",
                "y" : 2,
-               "name" : "Pete Houston",
-               "drilldown" : "Pete Houston"
+               "name" : "Pete Houston"
             },
             {
-               "name" : "Philippe Bruhat",
+               "drilldown" : "Philippe Bruhat",
                "y" : 3,
-               "drilldown" : "Philippe Bruhat"
+               "name" : "Philippe Bruhat"
             },
             {
-               "drilldown" : "Prajith P",
                "name" : "Prajith P",
-               "y" : 1
+               "y" : 1,
+               "drilldown" : "Prajith P"
             },
             {
-               "drilldown" : "Sean Meininger",
                "name" : "Sean Meininger",
-               "y" : 2
+               "y" : 2,
+               "drilldown" : "Sean Meininger"
             },
             {
                "y" : 6,
@@ -879,9 +874,9 @@
                "drilldown" : "Simon Proctor"
             },
             {
+               "drilldown" : "Simon Reinhardt",
                "name" : "Simon Reinhardt",
-               "y" : 2,
-               "drilldown" : "Simon Reinhardt"
+               "y" : 2
             },
             {
                "drilldown" : "Steve Rogerson",
@@ -889,31 +884,36 @@
                "name" : "Steve Rogerson"
             },
             {
-               "drilldown" : "Steven Wilson",
                "y" : 2,
-               "name" : "Steven Wilson"
+               "name" : "Steven Wilson",
+               "drilldown" : "Steven Wilson"
             },
             {
+               "drilldown" : "Tiago Stock",
                "y" : 1,
-               "name" : "Tiago Stock",
-               "drilldown" : "Tiago Stock"
+               "name" : "Tiago Stock"
             },
             {
-               "name" : "Tore Andersson",
+               "drilldown" : "Tore Andersson",
                "y" : 2,
-               "drilldown" : "Tore Andersson"
+               "name" : "Tore Andersson"
             },
             {
                "drilldown" : "Veesh Goldman",
-               "y" : 1,
-               "name" : "Veesh Goldman"
+               "name" : "Veesh Goldman",
+               "y" : 1
             },
             {
                "y" : 1,
                "name" : "William Gilmore",
                "drilldown" : "William Gilmore"
             }
-         ]
+         ],
+         "colorByPoint" : 1,
+         "name" : "Perl Weekly Challenge - 001"
       }
-   ]
+   ],
+   "chart" : {
+      "type" : "column"
+   }
 }
diff --git a/stats/pwc-challenge-002.json b/stats/pwc-challenge-002.json
index 94dac8ffab..1aae64219e 100644
--- a/stats/pwc-challenge-002.json
+++ b/stats/pwc-challenge-002.json
@@ -1,260 +1,26 @@
 {
-   "series" : [
-      {
-         "colorByPoint" : 1,
-         "name" : "Perl Weekly Challenge - 002",
-         "data" : [
-            {
-               "drilldown" : "Adam Russell",
-               "name" : "Adam Russell",
-               "y" : 3
-            },
-            {
-               "drilldown" : "Ailbhe Tweedie",
-               "y" : 2,
-               "name" : "Ailbhe Tweedie"
-            },
-            {
-               "y" : 2,
-               "name" : "Alex Daniel",
-               "drilldown" : "Alex Daniel"
-            },
-            {
-               "drilldown" : "Andrezgz",
-               "name" : "Andrezgz",
-               "y" : 2
-            },
-            {
-               "drilldown" : "Arne Sommer",
-               "name" : "Arne Sommer",
-               "y" : 3
-            },
-            {
-               "drilldown" : "Arpad Toth",
-               "y" : 2,
-               "name" : "Arpad Toth"
-            },
-            {
-               "drilldown" : "Athanasius",
-               "y" : 2,
-               "name" : "Athanasius"
-            },
-            {
-               "y" : 2,
-               "name" : "Bob Kleemann",
-               "drilldown" : "Bob Kleemann"
-            },
-            {
-               "y" : 2,
-               "name" : "Chenyf",
-               "drilldown" : "Chenyf"
-            },
-            {
-               "drilldown" : "Daniel Mantovani",
-               "y" : 1,
-               "name" : "Daniel Mantovani"
-            },
-            {
-               "drilldown" : "Dave Jacoby",
-               "y" : 1,
-               "name" : "Dave Jacoby"
-            },
-            {
-               "drilldown" : "David Kayal",
-               "name" : "David Kayal",
-               "y" : 2
-            },
-            {
-               "name" : "Doug Schrag",
-               "y" : 2,
-               "drilldown" : "Doug Schrag"
-            },
-            {
-               "drilldown" : "Dr James A. Smith",
-               "y" : 4,