- Added solutions by Eric Cheung.

- Added solutions by Bob Lied.
- Added solutions by David Ferrone.
- Added solutions by Packy Anderson.
- Added solutions by PokGoPun.
- Added solutions by Niels van Dijke.
- Added solutions by Feng Chang.
- Added solutions by Mark Anderson.
- Added solutions by E. Choroba.
- Added solutions by Steven Wilson.

23 files changed, 3755 insertions, 3487 deletions

diff --git a/challenge-270/eric-cheung/python/ch-1.py b/challenge-270/eric-cheung/python/ch-1.py
new file mode 100755
index 0000000000..d0383836c7
--- /dev/null
+++ b/challenge-270/eric-cheung/python/ch-1.py
@@ -0,0 +1,25 @@
+

+def IsPosSpecial (arrInput, nRow, nCol):

+    if arrInput[nRow][nCol] == 0:

+        return False

+

+    for nRowLoop in range(len(arrInput)):

+        if nRowLoop == nRow:

+            continue

+        if arrInput[nRowLoop][nCol] == 1:

+            return False

+

+    for nColLoop in range(len(arrInput[0])):

+        if nColLoop == nCol:

+            continue

+        if arrInput[nRow][nColLoop] == 1:

+            return False

+

+    return True

+

+## arrMatrix = [[1, 0, 0], [0, 0, 1], [1, 0, 0]]  ## Example 1

+arrMatrix = [[1, 0, 0], [0, 1, 0], [0, 0, 1]]  ## Example 2

+

+arrOutput = [[nRowIndx, nColIndx] for nRowIndx in range(len(arrMatrix)) for nColIndx in range(len(arrMatrix[0])) if IsPosSpecial (arrMatrix, nRowIndx, nColIndx)]

+

+print (len(arrOutput))

diff --git a/challenge-270/eric-cheung/python/ch-2.py b/challenge-270/eric-cheung/python/ch-2.py
new file mode 100755
index 0000000000..fdd90ffe3d
--- /dev/null
+++ b/challenge-270/eric-cheung/python/ch-2.py
@@ -0,0 +1,25 @@
+

+nCost = 0

+

+## Example 1

+arrInt = [4, 1]

+nX = 3

+nY = 2

+

+## Example 2

+## arrInt = [2, 3, 3, 3, 5]

+## nX = 2

+## nY = 1

+

+while len(set(arrInt)) > 1:

+    arrInt = sorted(arrInt)

+    

+    if len(set(arrInt)) == 2 and arrInt.count(arrInt[0]) == 1:

+        nCost = nCost + nX

+    else:

+        arrInt[1] = arrInt[1] + 1

+        nCost = nCost + nY

+

+    arrInt[0] = arrInt[0] + 1

+

+print (nCost)

diff --git a/challenge-271/eric-cheung/python/ch-1.py b/challenge-271/eric-cheung/python/ch-1.py
new file mode 100755
index 0000000000..4913afcb8a
--- /dev/null
+++ b/challenge-271/eric-cheung/python/ch-1.py
@@ -0,0 +1,10 @@
+

+import numpy as np

+

+## arrMatrix = [[0, 1], [1, 0]]  ## Example 1

+## arrMatrix = [[0, 0, 0], [1, 0, 1]]  ## Example 2

+arrMatrix = [[0, 0], [1, 1], [0, 0]]  ## Example 3

+

+arrNumOne = [arrMatrix[nLoop].count(1) for nLoop in range(len(arrMatrix))]

+

+print (np.argmax(arrNumOne) + 1)

diff --git a/challenge-271/eric-cheung/python/ch-2.py b/challenge-271/eric-cheung/python/ch-2.py
new file mode 100755
index 0000000000..847b810677
--- /dev/null
+++ b/challenge-271/eric-cheung/python/ch-2.py
@@ -0,0 +1,9 @@
+

+## arrInt = [0, 1, 2, 3, 4, 5, 6, 7, 8]  ## Example 1

+arrInt = [1024, 512, 256, 128, 64]  ## Example 2

+

+arrOrder = [[bin(nElem).replace("0b", "").count("1"), nElem] for nElem in arrInt]

+

+arrOutput = [nElem for strSort, nElem in sorted(arrOrder, key = lambda nElem: (nElem[0], nElem[1]))]

+

+print (arrOutput)

diff --git a/challenge-271/perlboy1967/perl/ch1.pl b/challenge-271/perlboy1967/perl/ch-1.pl
index 0e548569b8..0e548569b8 100755
--- a/challenge-271/perlboy1967/perl/ch1.pl
+++ b/challenge-271/perlboy1967/perl/ch-1.pl
diff --git a/challenge-271/perlboy1967/perl/ch2.pl b/challenge-271/perlboy1967/perl/ch-2.pl
index e3c23e9007..e3c23e9007 100755
--- a/challenge-271/perlboy1967/perl/ch2.pl
+++ b/challenge-271/perlboy1967/perl/ch-2.pl
diff --git a/stats/pwc-challenge-270.json b/stats/pwc-challenge-270.json
new file mode 100644
index 0000000000..1ab6e4b33b
--- /dev/null
+++ b/stats/pwc-challenge-270.json
@@ -0,0 +1,574 @@
+{
+   "subtitle" : {
+      "text" : "[Champions: 30] Last updated at 2024-05-27 11:19:38 GMT"
+   },
+   "legend" : {
+      "enabled" : 0
+   },
+   "xAxis" : {
+      "type" : "category"
+   },
+   "tooltip" : {
+      "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/>",
+      "followPointer" : 1
+   },
+   "chart" : {
+      "type" : "column"
+   },
+   "drilldown" : {
+      "series" : [
+         {
+            "data" : [
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "name" : "Arne Sommer",
+            "id" : "Arne Sommer"
+         },
+         {
+            "id" : "Athanasius",
+            "name" : "Athanasius",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Raku",
+                  2
+               ]
+            ]
+         },
+         {
+            "id" : "BarrOff",
+            "data" : [
+               [
+                  "Raku",
+                  1
+               ]
+            ],
+            "name" : "BarrOff"
+         },
+         {
+            "id" : "Bob Lied",
+            "name" : "Bob Lied",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ]
+         },
+         {
+            "id" : "Bruce Gray",
+            "name" : "Bruce Gray",
+            "data" : [
+               [
+                  "Raku",
+                  2
+               ]
+            ]
+         },
+         {
+            "id" : "Dave Jacoby",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "name" : "Dave Jacoby"
+         },
+         {
+            "id" : "David Ferrone",
+            "name" : "David Ferrone",
+            "data" : [
+               [
+                  "Perl",
+                  1
+               ]
+            ]
+         },
+         {
+            "name" : "E. Choroba",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ],
+            "id" : "E. Choroba"
+         },
+         {
+            "id" : "Feng Chang",
+            "name" : "Feng Chang",
+            "data" : [
+               [
+                  "Raku",
+                  2
+               ]
+            ]
+         },
+         {
+            "id" : "Jan Krnavek",
+            "name" : "Jan Krnavek",
+            "data" : [
+               [
+                  "Raku",
+                  1
+               ]
+            ]
+         },
+         {
+            "name" : "Jorg Sommrey",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "Jorg Sommrey"
+         },
+         {
+            "name" : "Lance Wicks",
+            "data" : [
+               [
+                  "Perl",
+                  1
+               ]
+            ],
+            "id" : "Lance Wicks"
+         },
+         {
+            "id" : "Laurent Rosenfeld",
+            "name" : "Laurent Rosenfeld",
+            "data" : [
+               [
+                  "Perl",
+                  1
+               ],
+               [
+                  "Raku",
+                  1
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ]
+         },
+         {
+            "name" : "Luca Ferrari",
+            "data" : [
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  9
+               ]
+            ],
+            "id" : "Luca Ferrari"
+         },
+         {
+            "id" : "Mark Anderson",
+            "name" : "Mark Anderson",
+            "data" : [
+               [
+                  "Raku",
+                  1
+               ]
+            ]
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  1
+               ]
+            ],
+            "name" : "Matthew Neleigh",
+            "id" : "Matthew Neleigh"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "name" : "Matthias Muth",
+            "id" : "Matthias Muth"
+         },
+         {
+            "id" : "Nelo Tovar",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ],
+            "name" : "Nelo Tovar"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ],
+            "name" : "Niels van Dijke",
+            "id" : "Niels van Dijke"
+         },
+         {
+            "id" : "Packy Anderson",
+            "name" : "Packy Anderson",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ]
+         },
+         {
+            "id" : "Peter Campbell Smith",
+            "name" : "Peter Campbell Smith",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ]
+         },
+         {
+            "name" : "Peter Meszaros",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ],
+            "id" : "Peter Meszaros"
+         },
+         {
+            "id" : "Reinier Maliepaard",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  2
+               ]
+            ],
+            "name" : "Reinier Maliepaard"
+         },
+         {
+            "name" : "Robbie Hatley",
+            "data" : [
+               [
+                  "Perl",
+                  1
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "Robbie Hatley"
+         },
+         {
+            "id" : "Robert Ransbottom",
+            "data" : [
+               [
+                  "Raku",
+                  2
+               ]
+            ],
+            "name" : "Robert Ransbottom"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "name" : "Roger Bell_West",
+            "id" : "Roger Bell_West"
+         },
+         {
+            "name" : "Simon Green",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "Simon Green"
+         },
+         {
+            "name" : "Thomas Kohler",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  2
+               ]
+            ],
+            "id" : "Thomas Kohler"
+         },
+         {
+            "name" : "Ulrich Rieke",
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Raku",
+                  2
+               ]
+            ],
+            "id" : "Ulrich Rieke"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "name" : "W. Luis Mochan",
+            "id" : "W. Luis Mochan"
+         }
+      ]
+   },
+   "title" : {
+      "text" : "The Weekly Challenge - 270"
+   },
+   "plotOptions" : {
+      "series" : {
+         "borderWidth" : 0,
+         "dataLabels" : {
+            "enabled" : 1,
+            "format" : "{point.y}"
+         }
+      }
+   },
+   "yAxis" : {
+      "title" : {
+         "text" : "Total Solutions"
+      }
+   },
+   "series" : [
+      {
+         "colorByPoint" : 1,
+         "name" : "The Weekly Challenge - 270",
+         "data" : [
+            {
+               "drilldown" : "Arne Sommer",
+               "y" : 3,
+               "name" : "Arne Sommer"
+            },
+            {
+               "y" : 4,
+               "drilldown" : "Athanasius",
+               "name" : "Athanasius"
+            },
+            {
+               "name" : "BarrOff",
+               "drilldown" : "BarrOff",
+               "y" : 1
+            },
+            {
+               "y" : 2,
+               "drilldown" : "Bob Lied",
+               "name" : "Bob Lied"
+            },
+            {
+               "name" : "Bruce Gray",
+               "drilldown" : "Bruce Gray",
+               "y" : 2
+            },
+            {
+               "name" : "Dave Jacoby",
+               "drilldown" : "Dave Jacoby",
+               "y" : 3
+            },
+            {
+               "name" : "David Ferrone",
+               "drilldown" : "David Ferrone",
+               "y" : 1
+            },
+            {
+               "name" : "E. Choroba",
+               "y" : 2,
+               "drilldown" : "E. Choroba"
+            },
+            {
+               "name" : "Feng Chang",
+               "y" : 2,
+               "drilldown" : "Feng Chang"
+            },
+            {
+               "name" : "Jan Krnavek",
+               "y" : 1,
+               "drilldown" : "Jan Krnavek"
+            },
+            {
+               "name" : "Jorg Sommrey",
+               "drilldown" : "Jorg Sommrey",
+               "y" : 3
+            },
+            {
+               "name" : "Lance Wicks",
+               "drilldown" : "Lance Wicks",
+               "y" : 1
+            },
+            {
+               "name" : "Laurent Rosenfeld",
+               "y" : 3,
+               "drilldown" : "Laurent Rosenfeld"
+            },
+            {
+               "drilldown" : "Luca Ferrari",
+               "y" : 11,
+               "name" : "Luca Ferrari"
+            },
+            {
+               "y" : 1,
+               "drilldown" : "Mark Anderson",
+               "name" : "Mark Anderson"
+            },
+            {
+               "name" : "Matthew Neleigh",
+               "y" : 1,
+               "drilldown" : "Matthew Neleigh"
+            },
+            {
+               "drilldown" : "Matthias Muth",
+               "y" : 3,
+               "name" : "Matthias Muth"
+            },
+            {
+               "drilldown" : "Nelo Tovar",
+               "y" : 2,
+               "name" : "Nelo Tovar"
+            },
+            {
+               "drilldown" : "Niels van Dijke",
+               "y" : 2,
+               "name" : "Niels van Dijke"
+            },
+            {
+               "name" : "Packy Anderson",
+               "y" : 5,
+               "drilldown" : "Packy Anderson"
+            },
+            {
+               "drilldown" : "Peter Campbell Smith",
+               "y" : 3,
+               "name" : "Peter Campbell Smith"
+            },
+            {
+               "name" : "Peter Meszaros",
+               "y" : 2,
+               "drilldown" : "Peter Meszaros"
+            },
+            {
+               "name" : "Reinier Maliepaard",
+               "y" : 4,
+               "drilldown" : "Reinier Maliepaard"
+            },
+            {
+               "name" : "Robbie Hatley",
+               "y" : 2,
+               "drilldown" : "Robbie Hatley"
+            },
+            {
+               "drilldown" : "Robert Ransbottom",
+               "y" : 2,
+               "name" : "Robert Ransbottom"
+            },
+            {
+               "y" : 5,
+               "drilldown" : "Roger Bell_West",
+               "name" : "Roger Bell_West"
+            },
+            {
+               "y" : 3,
+               "drilldown" : "Simon Green",
+               "name" : "Simon Green"
+            },
+            {
+               "name" : "Thomas Kohler",
+               "drilldown" : "Thomas Kohler",
+               "y" : 4
+            },
+            {
+               "name" : "Ulrich Rieke",
+               "drilldown" : "Ulrich Rieke",
+               "y" : 4
+            },
+            {
+               "drilldown" : "W. Luis Mochan",
+               "y" : 3,
+               "name" : "W. Luis Mochan"
+            }
+         ]
+      }
+   ]
+}
diff --git a/stats/pwc-current.json b/stats/pwc-current.json
index 55bc5c0ec4..242f5d4a03 100644
--- a/stats/pwc-current.json
+++ b/stats/pwc-current.json
@@ -1,506 +1,108 @@
 {
-   "plotOptions" : {
-      "series" : {
-         "dataLabels" : {
-            "enabled" : 1,
-            "format" : "{point.y}"
-         },
-         "borderWidth" : 0
-      }
-   },
-   "chart" : {
-      "type" : "column"
-   },
-   "legend" : {
-      "enabled" : 0
-   },
-   "series" : [
-      {
-         "name" : "The Weekly Challenge - 270",
-         "colorByPoint" : 1,
-         "data" : [
-            {
-               "name" : "Arne Sommer",
-               "y" : 3,
-               "drilldown" : "Arne Sommer"
-            },
-            {
-               "drilldown" : "Athanasius",
-               "name" : "Athanasius",
-               "y" : 4
-            },
-            {
-               "drilldown" : "BarrOff",
-               "name" : "BarrOff",
-               "y" : 1
-            },
-            {
-               "y" : 2,
-               "name" : "Bruce Gray",
-               "drilldown" : "Bruce Gray"
-            },
-            {
-               "name" : "Dave Jacoby",
-               "y" : 3,
-               "drilldown" : "Dave Jacoby"
-            },
-            {
-               "drilldown" : "David Ferrone",
-               "y" : 1,
-               "name" : "David Ferrone"
-            },
-            {
-               "name" : "Jan Krnavek",
-               "y" : 1,
-               "drilldown" : "Jan Krnavek"
-            },
-            {
-               "y" : 3,
-               "name" : "Jorg Sommrey",
-               "drilldown" : "Jorg Sommrey"
-            },
-            {
-               "drilldown" : "Lance Wicks",
-               "name" : "Lance Wicks",
-               "y" : 1
-            },
-            {
-               "name" : "Laurent Rosenfeld",
-               "y" : 3,
-               "drilldown" : "Laurent Rosenfeld"
-            },
-            {
-               "drilldown" : "Luca Ferrari",
-               "y" : 11,
-               "name" : "Luca Ferrari"
-            },
-            {
-               "drilldown" : "Mark Anderson",
-               "y" : 1,
-               "name" : "Mark Anderson"
-            },
-            {
-               "name" : "Matthew Neleigh",
-               "y" : 1,
-               "drilldown" : "Matthew Neleigh"
-            },
-            {
-               "y" : 3,
-               "name" : "Matthias Muth",
-               "drilldown" : "Matthias Muth"
-            },
-            {
-               "name" : "Nelo Tovar",
-               "y" : 2,
-               "drilldown" : "Nelo Tovar"
-            },
-            {
-               "drilldown" : "Niels van Dijke",
-               "name" : "Niels van Dijke",
-               "y" : 2
-            },
-            {
-               "drilldown" : "Peter Campbell Smith",
-               "name" : "Peter Campbell Smith",
-               "y" : 3
-            },
-            {
-               "y" : 2,
-               "name" : "Peter Meszaros",
-               "drilldown" : "Peter Meszaros"
-            },
-            {
-               "drilldown" : "Reinier Maliepaard",
-               "y" : 4,
-               "name" : "Reinier Maliepaard"
-            },
-            {
-               "drilldown" : "Robbie Hatley",
-               "y" : 2,
-               "name" : "Robbie Hatley"
-            },
-            {
-               "drilldown" : "Robert Ransbottom",
-               "y" : 2,
-               "name" : "Robert Ransbottom"
-            },
-            {
-               "y" : 5,
-               "name" : "Roger Bell_West",
-               "drilldown" : "Roger Bell_West"
-            },
-            {
-               "y" : 3,
-               "name" : "Simon Green",
-               "drilldown" : "Simon Green"
-            },
-            {
-               "y" : 4,
-               "name" : "Thomas Kohler",
-               "drilldown" : "Thomas Kohler"
-            },
-            {
-               "y" : 4,
-               "name" : "Ulrich Rieke",
-               "drilldown" : "Ulrich Rieke"
-            },
-            {
-               "name" : "W. Luis Mochan",
-               "y" : 3,
-               "drilldown" : "W. Luis Mochan"
-            }
-         ]
-      }
-   ],
-   "xAxis" : {
-      "type" : "category"
-   },
    "tooltip" : {
-      "headerFormat" : "<span style='font-size:11px'>{series.name}</span><br/>",
       "followPointer" : 1,
+      "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/>"
    },
+   "xAxis" : {
+      "type" : "category"
+   },
    "title" : {
-      "text" : "The Weekly Challenge - 270"
+      "text" : "The Weekly Challenge - 271"
    },
    "drilldown" : {
       "series" : [
          {
-            "name" : "Arne Sommer",
-            "id" : "Arne Sommer",
-            "data" : [
-               [
-                  "Raku",
-                  2
-               ],
-               [
-                  "Blog",
-                  1
-               ]
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-         },
-         {
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-                  2
-               ],
-               [
-                  "Raku",
-                  2
-               ]
-            ],
-            "id" : "Athanasius"
-         },
-         {
-            "data" : [
-               [
-                  "Raku",
-                  1
-               ]
-            ],
-            "id" : "BarrOff",
-            "name" : "BarrOff"
-         },
-         {
-            "name" : "Bruce Gray",
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-               [
-                  "Raku",
-                  2
-               ]
-            ],
-            "id" : "Bruce Gray"
-         },
-         {
-            "name" : "Dave Jacoby",
-            "id" : "Dave Jacoby",
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-                  "Perl",
-                  2
-               ],
-               [
-                  "Blog",
-                  1
-               ]
-            ]
-         },
-         {
-            "data" : [
-               [
-                  "Perl",
-                  1
-               ]
-            ],
+            "name" : "David Ferrone",
             "id" : "David Ferrone",
-            "name" : "David Ferrone"
-         },
-         {
-            "id" : "Jan Krnavek",
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-                  "Raku",
-                  1
-               ]
-            ],
-            "name" : "Jan Krnavek"
-         },
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             "data" : [
                [
                   "Perl",
                   2
-               ],
-               [
-                  "Blog",
-                  1
-               ]
-            ],
-            "id" : "Jorg Sommrey",
-            "name" : "Jorg Sommrey"
-         },
-         {
-            "id" : "Lance Wicks",
-            "data" : [
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-                  "Perl",
-                  1
-               ]
-            ],
-            "name" : "Lance Wicks"
-         },
-         {
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-                  "Perl",
-                  1
-               ],
-               [
-                  "Raku",
-                  1
-               ],
-               [
-                  "Blog",
-                  1
                ]
-            ],
-            "id" : "Laurent Rosenfeld",
-            "name" : "Laurent Rosenfeld"
+            ]
          },
          {
-            "name" : "Luca Ferrari",
+            "name" : "Feng Chang",
+            "id" : "Feng Chang",
             "data" : [
                [
                   "Raku",
                   2
-               ],
-               [
-                  "Blog",
-                  9
                ]
-            ],
-            "id" : "Luca Ferrari"
+            ]
          },
          {
+            "id" : "Mark Anderson",
             "name" : "M