PWC 341

Task 1 Raku done
Task 2 Raku done

Task 1 PL/Perl done
Task 2 PL/Perl done

Task 1 PL/PgSQL done
Task 2 PL/PgSQL done

Task 1 PL/Java done
Task 2 PL/Java done

Task 1 Python done
Task 2 Python done

21 files changed, 372 insertions, 3 deletions

diff --git a/challenge-341/luca-ferrari/blog-1.txt b/challenge-341/luca-ferrari/blog-1.txt
new file mode 100644
index 0000000000..2fa473d077
--- /dev/null
+++ b/challenge-341/luca-ferrari/blog-1.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2025/10/02/PerlWeeklyChallenge341.html#task1
diff --git a/challenge-341/luca-ferrari/blog-10.txt b/challenge-341/luca-ferrari/blog-10.txt
new file mode 100644
index 0000000000..482fb5c6cc
--- /dev/null
+++ b/challenge-341/luca-ferrari/blog-10.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2025/10/02/PerlWeeklyChallenge341.html#task2pljava
diff --git a/challenge-341/luca-ferrari/blog-2.txt b/challenge-341/luca-ferrari/blog-2.txt
new file mode 100644
index 0000000000..2478b191d6
--- /dev/null
+++ b/challenge-341/luca-ferrari/blog-2.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2025/10/02/PerlWeeklyChallenge341.html#task2
diff --git a/challenge-341/luca-ferrari/blog-3.txt b/challenge-341/luca-ferrari/blog-3.txt
new file mode 100644
index 0000000000..8249ff790e
--- /dev/null
+++ b/challenge-341/luca-ferrari/blog-3.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2025/10/02/PerlWeeklyChallenge341.html#task1plperl
diff --git a/challenge-341/luca-ferrari/blog-4.txt b/challenge-341/luca-ferrari/blog-4.txt
new file mode 100644
index 0000000000..78d9dcc704
--- /dev/null
+++ b/challenge-341/luca-ferrari/blog-4.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2025/10/02/PerlWeeklyChallenge341.html#task2plperl
diff --git a/challenge-341/luca-ferrari/blog-5.txt b/challenge-341/luca-ferrari/blog-5.txt
new file mode 100644
index 0000000000..86efca83bb
--- /dev/null
+++ b/challenge-341/luca-ferrari/blog-5.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2025/10/02/PerlWeeklyChallenge341.html#task1plpgsql
diff --git a/challenge-341/luca-ferrari/blog-6.txt b/challenge-341/luca-ferrari/blog-6.txt
new file mode 100644
index 0000000000..14f40b3af9
--- /dev/null
+++ b/challenge-341/luca-ferrari/blog-6.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2025/10/02/PerlWeeklyChallenge341.html#task2plpgsql
diff --git a/challenge-341/luca-ferrari/blog-7.txt b/challenge-341/luca-ferrari/blog-7.txt
new file mode 100644
index 0000000000..7f7d1b01bb
--- /dev/null
+++ b/challenge-341/luca-ferrari/blog-7.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2025/10/02/PerlWeeklyChallenge341.html#task1python
diff --git a/challenge-341/luca-ferrari/blog-8.txt b/challenge-341/luca-ferrari/blog-8.txt
new file mode 100644
index 0000000000..de5aa1d3d5
--- /dev/null
+++ b/challenge-341/luca-ferrari/blog-8.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2025/10/02/PerlWeeklyChallenge341.html#task2python
diff --git a/challenge-341/luca-ferrari/blog-9.txt b/challenge-341/luca-ferrari/blog-9.txt
new file mode 100644
index 0000000000..9ca442ab45
--- /dev/null
+++ b/challenge-341/luca-ferrari/blog-9.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2025/10/02/PerlWeeklyChallenge341.html#task1pljava
diff --git a/challenge-341/luca-ferrari/pljava/pom.xml b/challenge-341/luca-ferrari/pljava/pom.xml
index 353e1821da..674fcf6c4d 100644
--- a/challenge-341/luca-ferrari/pljava/pom.xml
+++ b/challenge-341/luca-ferrari/pljava/pom.xml
@@ -7,14 +7,14 @@
 
   <groupId>PWC</groupId>
   <artifactId>
-    PWC333
+    PWC341
   </artifactId>
   <version>
     1
   </version>
 
-  <name>Perl Weekly Challenge 333 with package PWC333</name>
-  <description>Implementation of the tasks in PL/Java for PWC 333</description>
+  <name>Perl Weekly Challenge 341 with package PWC341</name>
+  <description>Implementation of the tasks in PL/Java for PWC 341</description>
 
   <properties>
     <project.build.sourceEncoding>US-ASCII</project.build.sourceEncoding>
diff --git a/challenge-341/luca-ferrari/pljava/src/main/java/Task1.java b/challenge-341/luca-ferrari/pljava/src/main/java/Task1.java
new file mode 100644
index 0000000000..284db05e0b
--- /dev/null
+++ b/challenge-341/luca-ferrari/pljava/src/main/java/Task1.java
@@ -0,0 +1,77 @@
+
+
+
+package PWC341;
+
+/**
+ * PL/Java implementation for PWC 341
+ * Task 1
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-341>
+ *
+ *
+ * To compile on the local machine:
+
+ $ export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64/  # if not already set
+ $ mvn clean build
+ $ scp target/PWC341-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC341-1.jar', 'PWC341', true );
+ select sqlj.set_classpath( 'public', 'PWC341' );
+
+ select pwc341.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC341-1.jar', 'PWC341', true );
+
+*/
+
+import org.postgresql.pljava.*;
+import org.postgresql.pljava.annotation.Function;
+import static org.postgresql.pljava.annotation.Function.Effects.IMMUTABLE;
+import static org.postgresql.pljava.annotation.Function.OnNullInput.RETURNS_NULL;
+
+import java.util.*;
+import java.util.stream.*;
+import java.sql.SQLException;
+import java.util.logging.*;
+import java.sql.ResultSet;
+import java.sql.Date;
+
+public class Task1 {
+
+    private final static Logger logger = Logger.getAnonymousLogger();
+
+    @Function( schema = "pwc341",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final String[] task1_pljava( String sentence, String[] keys ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc341.task1_pljava" );
+
+	List<String> words = new LinkedList<String>();
+	for ( String w : sentence.split( "\\s+" ) )
+	    words.add( w );
+
+	Iterator<String> iter = words.iterator();
+	while ( iter.hasNext() ) {
+	    String current_word = iter.next();
+	    boolean ok = true;
+	    for ( String k : keys )
+		if ( current_word.contains( k ) )
+		    ok = false;
+
+	    if ( ! ok )
+		iter.remove();
+	}
+
+	String result[] = new String[ words.size() ];
+	int i = 0;
+	for ( String w : words )
+	    result[ i++ ] = w;
+
+	return result;
+    }
+}
diff --git a/challenge-341/luca-ferrari/pljava/src/main/java/Task2.java b/challenge-341/luca-ferrari/pljava/src/main/java/Task2.java
new file mode 100644
index 0000000000..d7463aabe0
--- /dev/null
+++ b/challenge-341/luca-ferrari/pljava/src/main/java/Task2.java
@@ -0,0 +1,62 @@
+
+
+
+package PWC341;
+
+/**
+ * PL/Java implementation for PWC 341
+ * Task 2
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-341>
+ *
+ *
+ * To compile on the local machine:
+
+ $ export JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64/  # if not already set
+ $ mvn clean build
+ $ scp target/PWC341-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC341-1.jar', 'PWC341', true );
+ select sqlj.set_classpath( 'public', 'PWC341' );
+
+ select pwc341.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC341-1.jar', 'PWC341', true );
+
+*/
+
+import org.postgresql.pljava.*;
+import org.postgresql.pljava.annotation.Function;
+import static org.postgresql.pljava.annotation.Function.Effects.IMMUTABLE;
+import static org.postgresql.pljava.annotation.Function.OnNullInput.RETURNS_NULL;
+
+import java.util.*;
+import java.util.stream.*;
+import java.sql.SQLException;
+import java.util.logging.*;
+import java.sql.ResultSet;
+import java.sql.Date;
+
+public class Task2 {
+
+    private final static Logger logger = Logger.getAnonymousLogger();
+
+    @Function( schema = "pwc341",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final String task2_pljava( String word, String prefix ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc341.task2_pljava" );
+
+	int index = word.indexOf( prefix, 1 );
+	StringBuilder builder = new StringBuilder();
+
+	builder.append( word.substring( 0, index ) );
+	builder.reverse();
+	return builder.toString() + word.substring( index + 1 );
+
+    }
+}
diff --git a/challenge-341/luca-ferrari/plperl/ch-1.plperl b/challenge-341/luca-ferrari/plperl/ch-1.plperl
new file mode 100644
index 0000000000..54cf12b5f4
--- /dev/null
+++ b/challenge-341/luca-ferrari/plperl/ch-1.plperl
@@ -0,0 +1,29 @@
+--
+-- Perl Weekly Challenge 341
+-- Task 1
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-341>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc341;
+
+CREATE OR REPLACE FUNCTION
+pwc341.task1_plperl( text, text[] )
+RETURNS SETOF text
+AS $CODE$
+
+   my ( $text, $keys ) = @_;
+
+   for my $word ( split /\s+/, $text ) {
+       my $found = 0;
+       for my $key ( $keys->@* ) {
+       	   $found += scalar grep { $_ eq $key } split( //, $word );
+	   last if ( $found );
+       }
+       
+       return_next( $word ) unless ( $found );
+   }
+
+return undef;
+
+$CODE$
+LANGUAGE plperl;
diff --git a/challenge-341/luca-ferrari/plperl/ch-2.plperl b/challenge-341/luca-ferrari/plperl/ch-2.plperl
new file mode 100644
index 0000000000..6d40bb266e
--- /dev/null
+++ b/challenge-341/luca-ferrari/plperl/ch-2.plperl
@@ -0,0 +1,25 @@
+--
+-- Perl Weekly Challenge 341
+-- Task 2
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-341>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc341;
+
+CREATE OR REPLACE FUNCTION
+pwc341.task2_plperl( text, text )
+RETURNS text
+AS $CODE$
+
+   my ( $text, $prefix ) = @_;
+
+   my $index = index( $text, $prefix );
+   return $index unless( $index );
+
+   my @chars = split //, $text;
+   return join( '',
+                reverse( @chars[ 0 .. $index ] ),
+		@chars[ $index + 1 .. $#chars ] );
+   
+$CODE$
+LANGUAGE plperl;
diff --git a/challenge-341/luca-ferrari/plpgsql/ch-1.sql b/challenge-341/luca-ferrari/plpgsql/ch-1.sql
new file mode 100644
index 0000000000..41270eaabe
--- /dev/null
+++ b/challenge-341/luca-ferrari/plpgsql/ch-1.sql
@@ -0,0 +1,36 @@
+--
+-- Perl Weekly Challenge 341
+-- Task 1
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-341>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc341;
+
+CREATE OR REPLACE FUNCTION
+pwc341.task1_plpgsql( sentence text, keys text[] )
+RETURNS SETOF text
+AS $CODE$
+DECLARE
+	current_word text;
+	ko int;
+	k text;
+BEGIN
+	FOR current_word IN SELECT w FROM regexp_split_to_table( sentence, '\s+' ) w LOOP
+	    ko := 0;
+
+	    FOREACH k IN ARRAY keys LOOP
+	    	IF current_word ~ k THEN
+		   ko := ko + 1;
+		END IF;
+	    END LOOP;
+
+	    IF ko = 0 THEN
+	       RETURN NEXT current_word;
+	    END IF;
+
+	END LOOP;
+
+RETURN;
+END
+$CODE$
+LANGUAGE plpgsql;
diff --git a/challenge-341/luca-ferrari/plpgsql/ch-2.sql b/challenge-341/luca-ferrari/plpgsql/ch-2.sql
new file mode 100644
index 0000000000..d5947bac41
--- /dev/null
+++ b/challenge-341/luca-ferrari/plpgsql/ch-2.sql
@@ -0,0 +1,33 @@
+--
+-- Perl Weekly Challenge 341
+-- Task 2
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-341>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc341;
+
+CREATE OR REPLACE FUNCTION
+pwc341.task2_plpgsql( word text, p text )
+RETURNS text
+AS $CODE$
+DECLARE
+	i int;
+	j int;
+	tt text[];
+	r text := '';
+BEGIN
+	i := position( p IN word );
+	tt := regexp_split_to_array( word, '' );
+
+	j := i;
+	WHILE i > 0 LOOP
+	      r := r || tt[ i ];
+	      i := i - 1;
+	END LOOP;
+
+	r := r || array_to_string( tt[ j + 1 : ], '' );
+
+	RETURN r;
+END
+$CODE$
+LANGUAGE plpgsql;
diff --git a/challenge-341/luca-ferrari/python/ch-1.py b/challenge-341/luca-ferrari/python/ch-1.py
new file mode 100644
index 0000000000..011d3a9598
--- /dev/null
+++ b/challenge-341/luca-ferrari/python/ch-1.py
@@ -0,0 +1,34 @@
+#!python
+
+#
+# Perl Weekly Challenge 341
+# Task 1
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-341>
+#
+
+import sys
+
+# task implementation
+# the return value will be printed
+def task_1( args ):
+    sentence = args[ 0 ]
+    keys     = args[ 1 : ]
+    result   = []
+
+    for word in sentence.split():
+        found = False
+
+        for k in keys:
+            if k in word:
+                found = True
+
+        if not found:
+            result.append( word )
+
+    return ' '.join( result )
+
+
+# invoke the main without the command itself
+if __name__ == '__main__':
+    print( task_1( sys.argv[ 1: ] ) )
diff --git a/challenge-341/luca-ferrari/python/ch-2.py b/challenge-341/luca-ferrari/python/ch-2.py
new file mode 100644
index 0000000000..c27b0b937c
--- /dev/null
+++ b/challenge-341/luca-ferrari/python/ch-2.py
@@ -0,0 +1,25 @@
+#!python
+
+#
+# Perl Weekly Challenge 341
+# Task 2
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-341>
+#
+
+import sys
+
+# task implementation
+# the return value will be printed
+def task_2( args ):
+    word   = args[ 0 ]
+    prefix = args[ 1 ]
+
+    index = word.index( prefix )
+
+    return word[ index : 0 : -1 ] + word[ index : ]
+
+
+# invoke the main without the command itself
+if __name__ == '__main__':
+    print( task_2( sys.argv[ 1: ] ) )
diff --git a/challenge-341/luca-ferrari/raku/ch-1.raku b/challenge-341/luca-ferrari/raku/ch-1.raku
new file mode 100644
index 0000000000..4084ba207e
--- /dev/null
+++ b/challenge-341/luca-ferrari/raku/ch-1.raku
@@ -0,0 +1,25 @@
+#!raku
+
+#
+# Perl Weekly Challenge 341
+# Task 1
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-341>
+#
+
+sub MAIN( Str $text, *@keys ) {
+    $text.say and exit( 0 ) unless ( @keys.elems );
+
+    my @words;
+    for $text.split( / \s+ / ) -> $current-word {
+	my $found = 0;
+	for @keys {
+	    $found += $current-word.comb.grep( * ~~ $_ ).elems;
+	}
+	last if $found;
+
+	@words.push: $current-word;
+    }
+
+    @words.join( ' ' ).say;
+}
diff --git a/challenge-341/luca-ferrari/raku/ch-2.raku b/challenge-341/luca-ferrari/raku/ch-2.raku
new file mode 100644
index 0000000000..18cab1d04c
--- /dev/null
+++ b/challenge-341/luca-ferrari/raku/ch-2.raku
@@ -0,0 +1,13 @@
+#!raku
+
+#
+# Perl Weekly Challenge 341
+# Task 2
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-341>
+#
+
+sub MAIN( Str $text, Str $prefix where { $text ~~ / $prefix / } ) {
+    my $index = $text.comb( :skip-empty ).first( * ~~ $prefix, :k );
+    ( $text.comb[ 0 .. $index ].join.flip ~ $text.comb[ $index + 1 .. * - 1 ].join ).join.say;
+}