- Added solutions by Eric Cheung.

- Added solutions by Ulrich Rieke.
- Added solutions by Feng Chang.
- Added solutions by Mark Anderson.
- Added solutions by Andrew Shitov.
- Added solutions by Niels van Dijke.
- Added solutions by E. Choroba.
- Added solutions by PokGoPun.
- Added solutions by Ali Moradi.
- Added solutions by Andreas Mahnke.
- Added solutions by Peter Meszaros.
- Added solutions by David Ferrone.
- Added solutions by W. Luis Mochan.
- Added solutions by Thomas Kohler.

41 files changed, 948 insertions, 441 deletions

diff --git a/challenge-326/eric-cheung/python/ch-1.py b/challenge-326/eric-cheung/python/ch-1.py
new file mode 100755
index 0000000000..e9b004ffaa
--- /dev/null
+++ b/challenge-326/eric-cheung/python/ch-1.py
@@ -0,0 +1,10 @@
+

+from datetime import datetime

+

+## strDate = "2025-02-02"  ## Example 1

+## strDate = "2025-04-10"  ## Example 2

+strDate = "2025-09-07"  ## Example 3

+

+objDate = datetime.strptime(strDate, "%Y-%m-%d").timetuple()

+

+print (objDate.tm_yday)

diff --git a/challenge-326/eric-cheung/python/ch-2.py b/challenge-326/eric-cheung/python/ch-2.py
new file mode 100755
index 0000000000..347f9d2014
--- /dev/null
+++ b/challenge-326/eric-cheung/python/ch-2.py
@@ -0,0 +1,11 @@
+

+## arrInt = [1, 3, 2, 4]  ## Example 1

+## arrInt = [1, 1, 2, 2]  ## Example 2

+arrInt = [3, 1, 3, 2]  ## Example 3

+

+arrOutput = []

+

+for nIndx in range(1, len(arrInt), 2):

+    arrOutput = arrOutput + [arrInt[nIndx]] * arrInt[nIndx - 1]

+

+print (arrOutput)

diff --git a/challenge-326/feng-chang/README.md b/challenge-326/feng-chang/README.md
index 6d43a92a22..74e56de3ed 100644
--- a/challenge-326/feng-chang/README.md
+++ b/challenge-326/feng-chang/README.md
@@ -1,2 +1 @@
-# blog
-* [PWC #217](https://seaker.github.io/jekyll/update/2023/05/16/PWC-217.html)
+Solutions by Feng Chang.
diff --git a/challenge-326/feng-chang/raku/ch-1.raku b/challenge-326/feng-chang/raku/ch-1.raku
new file mode 100644
index 0000000000..637716a725
--- /dev/null
+++ b/challenge-326/feng-chang/raku/ch-1.raku
@@ -0,0 +1,5 @@
+#!/bin/env raku
+
+unit sub MAIN(Str:D $s);
+
+put $s.Date.day-of-year;
diff --git a/challenge-326/feng-chang/raku/ch-2.raku b/challenge-326/feng-chang/raku/ch-2.raku
new file mode 100644
index 0000000000..15baa6a610
--- /dev/null
+++ b/challenge-326/feng-chang/raku/ch-2.raku
@@ -0,0 +1,5 @@
+#!/bin/env raku
+
+unit sub MAIN(*@ints);
+
+put @ints.rotor(2).map({ .[1] xx .[0] }).flat;
diff --git a/challenge-326/perlboy1967/perl/ch1.pl b/challenge-326/perlboy1967/perl/ch-1.pl
index f194426bb6..f194426bb6 100755
--- a/challenge-326/perlboy1967/perl/ch1.pl
+++ b/challenge-326/perlboy1967/perl/ch-1.pl
diff --git a/challenge-326/perlboy1967/perl/ch2.pl b/challenge-326/perlboy1967/perl/ch-2.pl
index 1d542bf4bd..1d542bf4bd 100755
--- a/challenge-326/perlboy1967/perl/ch2.pl
+++ b/challenge-326/perlboy1967/perl/ch-2.pl
diff --git a/challenge-326/ulrich-rieke/cpp/ch-1.cpp b/challenge-326/ulrich-rieke/cpp/ch-1.cpp
new file mode 100755
index 0000000000..cfa8ba6374
--- /dev/null
+++ b/challenge-326/ulrich-rieke/cpp/ch-1.cpp
@@ -0,0 +1,34 @@
+#include <vector>

+#include <string>

+#include <sstream>

+#include <iostream>

+#include <chrono>

+

+std::vector<std::string> split( const std::string & text , char delimiter ) {

+   std::vector<std::string> tokens ;

+   std::string word ;

+   std::istringstream istr { text } ;

+   while ( std::getline( istr , word , delimiter ))

+      tokens.push_back( word ) ;

+   return tokens ;

+}

+

+int number_of_days( std::chrono::sys_days const & first , 

+      std::chrono::sys_days const & second ) {

+   return (second - first).count( ) ;

+}

+

+int main( ) {

+   std::cout << "Enter a valid date in the form YYYY-MM-DD!\n" ;

+   std::string dateline ;

+   std::cin >> dateline ;

+   auto parts { split( dateline , '-' ) } ;

+   std::chrono::year ye( std::stoi( parts[0] ) ) ;

+   std::chrono::month m( std::stoi( parts[1] ) ) ;

+   std::chrono::day d( std::stoi( parts[2] ) ) ;

+   std::chrono::year_month_day given = ye/ m / d ;

+   std::chrono::year_month_day start = ye/ 1 / 1 ;

+   std::cout << (number_of_days( start , given ) + 1 ) << '\n' ;

+   return 0 ;

+}

+

diff --git a/challenge-326/ulrich-rieke/cpp/ch-2.cpp b/challenge-326/ulrich-rieke/cpp/ch-2.cpp
new file mode 100755
index 0000000000..f7871488fc
--- /dev/null
+++ b/challenge-326/ulrich-rieke/cpp/ch-2.cpp
@@ -0,0 +1,38 @@
+#include <vector>

+#include <string>

+#include <sstream>

+#include <iostream>

+

+std::vector<std::string> split( const std::string & text , char delimiter ) {

+   std::vector<std::string> tokens ;

+   std::string word ;

+   std::istringstream istr { text } ;

+   while ( std::getline( istr , word , delimiter ))

+      tokens.push_back( word ) ;

+   return tokens ;

+}

+

+int main( ) {

+   std::cout << "Enter an even amount of positive integers separated by blanks!\n";

+   std::string line ;

+   std::getline( std::cin , line ) ;

+   auto tokens { split( line , ' ' ) } ;

+   std::vector<int> numbers ;

+   for ( auto s : tokens ) 

+      numbers.push_back(std::stoi( s ) ) ;

+   std::vector<int> solution ;

+   int len = numbers.size( ) ;

+   int pos = 0 ;

+   while ( pos < len - 1 ) {

+      int howmany = numbers[pos] ;

+      for ( int i = 0 ; i < howmany ; i++ ) 

+	 solution.push_back( numbers[pos + 1] ) ;

+      pos += 2 ;

+   }

+   std::cout << "( " ;

+   for ( int i : solution ) {

+      std::cout << i << ' ' ;

+   }

+   std::cout << ")\n" ;

+   return 0 ;

+}

diff --git a/challenge-326/ulrich-rieke/haskell/ch-1.hs b/challenge-326/ulrich-rieke/haskell/ch-1.hs
new file mode 100755
index 0000000000..40b49d3554
--- /dev/null
+++ b/challenge-326/ulrich-rieke/haskell/ch-1.hs
@@ -0,0 +1,20 @@
+module Challenge326

+   where

+import Data.Time.Calendar 

+import Data.List.Split ( splitOn ) 

+

+solution :: String -> Integer

+solution input = 

+   let [ part1 , part2 , part3 ] = splitOn "-" input

+       year                      = (read part1 :: Integer ) 

+       month                     = read part2

+       day                       = read part3

+       start                     = fromGregorian year 1 1 

+   in (diffDays ( fromGregorian year month day ) start) + 1

+

+main :: IO ( ) 

+main = do

+   putStrLn "Enter a date in the form YYYY-MM-DD !" 

+   dateline <- getLine

+   print $ solution dateline

+       

diff --git a/challenge-326/ulrich-rieke/haskell/ch-2.hs b/challenge-326/ulrich-rieke/haskell/ch-2.hs
new file mode 100755
index 0000000000..d563d8ca9c
--- /dev/null
+++ b/challenge-326/ulrich-rieke/haskell/ch-2.hs
@@ -0,0 +1,13 @@
+module Challenge326_2

+   where

+import Data.List.Split (chunksOf )

+

+solution :: [Int] -> [Int]

+solution list = foldl1 ( ++ ) $ map (\subli -> replicate ( head subli )

+ ( last subli ) ) $ chunksOf 2 list

+

+main :: IO ( ) 

+main = do

+   putStrLn "Enter an even amount of positive integers separated by blanks!"

+   numberline <- getLine

+   print $ solution $ map read $ words numberline

diff --git a/challenge-326/ulrich-rieke/perl/ch-1.pl b/challenge-326/ulrich-rieke/perl/ch-1.pl
new file mode 100755
index 0000000000..7512dda549
--- /dev/null
+++ b/challenge-326/ulrich-rieke/perl/ch-1.pl
@@ -0,0 +1,18 @@
+#!/usr/bin/perl ;

+use strict ;

+use warnings ;

+use feature 'say' ;

+use Date::Calc qw ( Delta_Days );

+

+say "Enter a date in the form YYYY-MM-DD !" ;

+my $line = <STDIN> ;

+chomp $line ;

+$line =~ s/\-0/\-/g ;

+if ( $line =~ /^(\d{4})\-(\d+)\-(\d+)$/ ) {

+   my ( $year , $month , $day ) = ( $1 , $2 , $3 ) ;

+   my $diff_days = Delta_Days( $year , 1 , 1 , $year , $month , $day) ;

+   say $diff_days + 1 ;

+}

+else {

+   say "Data not in the right format!" ;

+}

diff --git a/challenge-326/ulrich-rieke/perl/ch-2.pl b/challenge-326/ulrich-rieke/perl/ch-2.pl
new file mode 100755
index 0000000000..d46ee43e94
--- /dev/null
+++ b/challenge-326/ulrich-rieke/perl/ch-2.pl
@@ -0,0 +1,20 @@
+#!/usr/bin/perl ;

+use strict ;

+use warnings ;

+use feature 'say' ;

+

+say "Enter an even amount of positive integers separated by blanks!" ;

+my $line = <STDIN> ;

+chomp $line ;

+my @numbers = split( /\s/ , $line ) ;

+my $len = scalar( @numbers ) ;

+my @solution ;

+my $pos = 0 ;

+while ( $pos < $len - 1 ) {

+   my $howmany = $numbers[$pos] ;

+   for (0..$howmany - 1) {

+      push( @solution , $numbers[$pos + 1] ) ;

+   }

+   $pos += 2 ;

+}

+say "(" . join( ',' , @solution) . ")" ;

diff --git a/challenge-326/ulrich-rieke/raku/ch-1.raku b/challenge-326/ulrich-rieke/raku/ch-1.raku
new file mode 100755
index 0000000000..659a324bbe
--- /dev/null
+++ b/challenge-326/ulrich-rieke/raku/ch-1.raku
@@ -0,0 +1,16 @@
+use v6 ;

+

+say "Enter a valid date in the form YYYY-MM-DD !" ;

+my $line = $*IN.get ;

+my $someDate ;

+$line ~~ s:g/\- 0/\-/ ;

+if ( $line ~~ /^(\d ** 4) '-' (\d+) '-' (\d+)$/ ) {

+   my ( $year , $month , $day ) = ( +$0 , +$1 , +$2 ) ;

+   say ( $year , $month , $day ) ;

+   $someDate = Date.new( $year , $month , $day ) ;

+   my $start = Date.new( $year , 1 , 1 ) ;

+   say ($someDate - $start) + 1 ;

+}

+else {

+   say "Invalid format!" ;

+}

diff --git a/challenge-326/ulrich-rieke/raku/ch-2.raku b/challenge-326/ulrich-rieke/raku/ch-2.raku
new file mode 100755
index 0000000000..6b76f9a851
--- /dev/null
+++ b/challenge-326/ulrich-rieke/raku/ch-2.raku
@@ -0,0 +1,16 @@
+use v6 ;

+

+say "Enter an even amount of positive integers separated by blanks!" ;

+my $line = $*IN.get ;

+my @numbers = $line.words.map( {.Int} ) ;

+my $len = @numbers.elems ;

+my @solution ;

+my $pos = 0 ;

+while ( $pos < $len - 1 ) {

+   my $howmany = @numbers[$pos] ;

+   for (0..$howmany - 1 ) {

+      @solution.push( @numbers[$pos + 1]) ;

+   }

+   $pos += 2 ;

+}

+say "(" ~ @solution.join( ',' ) ~ ")" ;

diff --git a/challenge-326/ulrich-rieke/rust/ch-1.rs b/challenge-326/ulrich-rieke/rust/ch-1.rs
new file mode 100755
index 0000000000..bd9f5ea83a
--- /dev/null
+++ b/challenge-326/ulrich-rieke/rust/ch-1.rs
@@ -0,0 +1,14 @@
+use std::io ;
+use chrono::{NaiveDate , Datelike} ;
+
+fn main() {
+    println!("Enter a day in the format YYYY-MM-DD!");
+    let mut inline : String = String::new( ) ;
+    io::stdin( ).read_line( &mut inline ).unwrap( ) ;
+    let trimmed = inline.trim( ) ;
+    let year : i32 = trimmed[0..4].parse::<i32>( ).unwrap( ) ;
+    let mo : u32 = trimmed[5..7].parse::<u32>( ).unwrap( ) ;
+    let d : u32 = trimmed[8..10].parse::<u32>( ).unwrap( ) ;
+    let date = NaiveDate::from_ymd_opt( year , mo , d ).unwrap( ) ;
+    println!("{}" , Datelike::ordinal0( &date ) + 1) ;
+}
diff --git a/challenge-326/ulrich-rieke/rust/ch-2.rs b/challenge-326/ulrich-rieke/rust/ch-2.rs
new file mode 100755
index 0000000000..63fc008484
--- /dev/null
+++ b/challenge-326/ulrich-rieke/rust/ch-2.rs
@@ -0,0 +1,21 @@
+use std::io ;
+
+fn main() {
+    println!("Enter an even amount of positive integers separated by blanks!");
+    let mut inline : String = String::new( ) ;
+    io::stdin( ).read_line( &mut inline ).unwrap( ) ;
+    let numbers : Vec<u32> = inline.trim( ).split_whitespace( ).map( |s| 
+	  s.parse::<u32>( ).unwrap( )).collect( ) ;
+    let mut solution : Vec<u32> = Vec::new( ) ;
+    let len : usize = numbers.len( ) ;
+    let mut pos : usize = 0 ;
+    while pos < len - 1 {
+       let howmany : usize = numbers[pos] as usize ;
+       let num : u32 = numbers[pos + 1] ;
+       for _ in 0..howmany {
+	  solution.push( num ) ;
+       }
+       pos += 2 ;
+    }
+    println!("{:?}" , solution ) ;
+}
diff --git a/stats/pwc-challenge-325.json b/stats/pwc-challenge-325.json
new file mode 100644
index 0000000000..ab6b3109a1
--- /dev/null
+++ b/stats/pwc-challenge-325.json
@@ -0,0 +1,593 @@
+{
+   "chart" : {
+      "type" : "column"
+   },
+   "drilldown" : {
+      "series" : [
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  2
+               ]
+            ],
+            "id" : "Adam Russell",
+            "name" : "Adam Russell"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "Ali Moradi",
+            "name" : "Ali Moradi"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ],
+            "id" : "Andreas Mahnke",
+            "name" : "Andreas Mahnke"
+         },
+         {
+            "data" : [
+               [
+                  "Raku",
+                  2
+               ]
+            ],
+            "id" : "Andrew Shitov",
+            "name" : "Andrew Shitov"
+         },
+         {
+            "data" : [
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "Arne Sommer",
+            "name" : "Arne Sommer"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Raku",
+                  2
+               ]
+            ],
+            "id" : "Athanasius",
+            "name" : "Athanasius"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ],
+            "id" : "Bob Lied",
+            "name" : "Bob Lied"
+         },
+         {
+            "data" : [
+               [
+                  "Blog",
+                  2
+               ]
+            ],
+            "id" : "David Ferrone",
+            "name" : "David Ferrone"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ],
+            "id" : "E. Choroba",
+            "name" : "E. Choroba"
+         },
+         {
+            "data" : [
+               [
+                  "Raku",
+                  2
+               ]
+            ],
+            "id" : "Feng Chang",
+            "name" : "Feng Chang"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "Jaldhar H. Vyas",
+            "name" : "Jaldhar H. Vyas"
+         },
+         {
+            "data" : [
+               [
+                  "Raku",
+                  2
+               ]
+            ],
+            "id" : "Jan Krnavek",
+            "name" : "Jan Krnavek"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "Jorg Sommrey",
+            "name" : "Jorg Sommrey"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ],
+            "id" : "Kjetil Skotheim",
+            "name" : "Kjetil Skotheim"
+         },
+         {
+            "data" : [
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  10
+               ]
+            ],
+            "id" : "Luca Ferrari",
+            "name" : "Luca Ferrari"
+         },
+         {
+            "data" : [
+               [
+                  "Raku",
+                  2
+               ]
+            ],
+            "id" : "Mark Anderson",
+            "name" : "Mark Anderson"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "Matthias Muth",
+            "name" : "Matthias Muth"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ],
+            "id" : "Niels van Dijke",
+            "name" : "Niels van Dijke"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "Packy Anderson",
+            "name" : "Packy Anderson"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "Peter Campbell Smith",
+            "name" : "Peter Campbell Smith"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ],
+            "id" : "Peter Meszaros",
+            "name" : "Peter Meszaros"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "Robbie Hatley",
+            "name" : "Robbie Hatley"
+         },
+         {
+            "data" : [
+               [
+                  "Raku",
+                  2
+               ]
+            ],
+            "id" : "Robert Ransbottom",
+            "name" : "Robert Ransbottom"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Raku",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "Roger Bell_West",
+            "name" : "Roger Bell_West"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "Simon Green",
+            "name" : "Simon Green"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  2
+               ]
+            ],
+            "id" : "Thomas Kohler",
+            "name" : "Thomas Kohler"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Raku",
+                  2
+               ]
+            ],
+            "id" : "Ulrich Rieke",
+            "name" : "Ulrich Rieke"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  1
+               ]
+            ],
+            "id" : "W. Luis Mochan",
+            "name" : "W. Luis Mochan"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ],
+            "id" : "Walt Mankowski",
+            "name" : "Walt Mankowski"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ]
+            ],
+            "id" : "Wanderdoc",
+            "name" : "Wanderdoc"
+         },
+         {
+            "data" : [
+               [
+                  "Perl",
+                  2
+               ],
+               [
+                  "Blog",
+                  2
+               ]
+            ],
+            "id" : "Yitzchak Scott-Thoennes",
+            "name" : "Yitzchak Scott-Thoennes"
+         }
+      ]
+   },
+   "legend" : {
+      "enabled" : 0
+   },
+   "plotOptions" : {
+      "series" : {
+         "borderWidth" : 0,
+         "dataLabels" : {
+            "enabled" : 1,
+            "format" : "{point.y}"
+         }
+      }
+   },
+   "series" : [
+      {
+         "colorByPoint" : 1,
+         "data" : [
+            {
+               "drilldown" : "Adam Russell",
+               "name" : "Adam Russell",
+               "y" : 4
+            },
+            {
+               "drilldown" : "Ali Moradi",
+               "name" : "Ali Moradi",
+               "y" : 3
+            },
+            {
+               "drilldown" : "Andreas Mahnke",
+               "name" : "Andreas Mahnke",
+               "y" : 2
+            },
+            {
+               "drilldown" : "And