PWC 252

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 Python done
Task 2 Python done

Task 1 Java done
Task 2 Java done

20 files changed, 295 insertions, 0 deletions

diff --git a/challenge-252/luca-ferrari/blog-1.txt b/challenge-252/luca-ferrari/blog-1.txt
new file mode 100644
index 0000000000..f410e3161f
--- /dev/null
+++ b/challenge-252/luca-ferrari/blog-1.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2024/01/15/PerlWeeklyChallenge252.html#task1
diff --git a/challenge-252/luca-ferrari/blog-2.txt b/challenge-252/luca-ferrari/blog-2.txt
new file mode 100644
index 0000000000..175a30bc9d
--- /dev/null
+++ b/challenge-252/luca-ferrari/blog-2.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2024/01/15/PerlWeeklyChallenge252.html#task2
diff --git a/challenge-252/luca-ferrari/blog-3.txt b/challenge-252/luca-ferrari/blog-3.txt
new file mode 100644
index 0000000000..153b11f11a
--- /dev/null
+++ b/challenge-252/luca-ferrari/blog-3.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2024/01/15/PerlWeeklyChallenge252.html#task1plperl
diff --git a/challenge-252/luca-ferrari/blog-4.txt b/challenge-252/luca-ferrari/blog-4.txt
new file mode 100644
index 0000000000..df5d6c25dc
--- /dev/null
+++ b/challenge-252/luca-ferrari/blog-4.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2024/01/15/PerlWeeklyChallenge252.html#task2plperl
diff --git a/challenge-252/luca-ferrari/blog-5.txt b/challenge-252/luca-ferrari/blog-5.txt
new file mode 100644
index 0000000000..8db6bdda83
--- /dev/null
+++ b/challenge-252/luca-ferrari/blog-5.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2024/01/15/PerlWeeklyChallenge252.html#task1plpgsql
diff --git a/challenge-252/luca-ferrari/blog-6.txt b/challenge-252/luca-ferrari/blog-6.txt
new file mode 100644
index 0000000000..122385a3fa
--- /dev/null
+++ b/challenge-252/luca-ferrari/blog-6.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2024/01/15/PerlWeeklyChallenge252.html#task2plpgsql
diff --git a/challenge-252/luca-ferrari/blog-7.txt b/challenge-252/luca-ferrari/blog-7.txt
new file mode 100644
index 0000000000..b9eb4b6eb6
--- /dev/null
+++ b/challenge-252/luca-ferrari/blog-7.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2024/01/15/PerlWeeklyChallenge252.html#task1python
diff --git a/challenge-252/luca-ferrari/blog-8.txt b/challenge-252/luca-ferrari/blog-8.txt
new file mode 100644
index 0000000000..a94acff5f2
--- /dev/null
+++ b/challenge-252/luca-ferrari/blog-8.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2024/01/15/PerlWeeklyChallenge252.html#task2python
diff --git a/challenge-252/luca-ferrari/blog_10.txt b/challenge-252/luca-ferrari/blog_10.txt
new file mode 100644
index 0000000000..addc13bcda
--- /dev/null
+++ b/challenge-252/luca-ferrari/blog_10.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2024/01/15/PerlWeeklyChallenge252.html#task1java
diff --git a/challenge-252/luca-ferrari/blog_9.txt b/challenge-252/luca-ferrari/blog_9.txt
new file mode 100644
index 0000000000..6d2f931e4d
--- /dev/null
+++ b/challenge-252/luca-ferrari/blog_9.txt
@@ -0,0 +1 @@
+https://fluca1978.github.io/2024/01/15/PerlWeeklyChallenge252.html#task2java
diff --git a/challenge-252/luca-ferrari/java/ch_1.java b/challenge-252/luca-ferrari/java/ch_1.java
new file mode 100644
index 0000000000..c903dfbb88
--- /dev/null
+++ b/challenge-252/luca-ferrari/java/ch_1.java
@@ -0,0 +1,13 @@
+public class ch_1 {
+    public static void main( String argv[] ) {
+	int sum = 0;
+	for ( int i = 0; i < argv.length; i++ ) {
+	    if ( argv.length % ( i + 1 ) != 0 )
+		continue;
+
+	    sum += Math.pow( Integer.parseInt( argv[ i ] ), 2 );
+	}
+
+	System.out.println( sum );
+    }
+}
diff --git a/challenge-252/luca-ferrari/java/ch_2.java b/challenge-252/luca-ferrari/java/ch_2.java
new file mode 100644
index 0000000000..5a4b46083a
--- /dev/null
+++ b/challenge-252/luca-ferrari/java/ch_2.java
@@ -0,0 +1,40 @@
+import java.util.*;
+
+public class ch_2 {
+    public static void main( String argv[] ) throws Exception {
+	int size = Integer.parseInt( argv[ 0 ] );
+
+	if ( size <= 3 )
+	    throw new Exception( "Cannot work with a size less than 3!" );
+
+	List<Integer> nums = new LinkedList<Integer>();
+
+
+	if ( size % 2 == 0 ) {
+	    for ( int i = 1; i < size / 2 ; i++ ) {
+		nums.add( i );
+		nums.add( i * -1 );
+	    }
+	}
+	else {
+	    for ( int i = 1; i < ( size - 1 ) / 2 ; i++ ) {
+		nums.add( i );
+		nums.add( i * -1 );
+	    }
+
+	    int next = ( size - 1 ) / 2 + 1;
+	    nums.add( next );
+	    nums.add( next + 1 );
+	    nums.add( ( next * 2 + 1 ) * -1 );
+	}
+
+
+	boolean printedOne = false;
+	for ( int i : nums ) {
+	    System.out.print( i + ( printedOne ? ", " : "" ) );
+	    printedOne = true;
+	}
+
+	System.out.println();
+    }
+}
diff --git a/challenge-252/luca-ferrari/postgresql/ch-1.plperl b/challenge-252/luca-ferrari/postgresql/ch-1.plperl
new file mode 100644
index 0000000000..5d8298c3e7
--- /dev/null
+++ b/challenge-252/luca-ferrari/postgresql/ch-1.plperl
@@ -0,0 +1,24 @@
+--
+-- Perl Weekly Challenge 252
+-- Task 1
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-252/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc252;
+
+CREATE OR REPLACE FUNCTION
+pwc252.task1_plperl( int[] )
+RETURNS int
+AS $CODE$
+   my ( $nums ) = @_;
+
+   my ( $sum ) = 0;
+   
+   for ( 0 .. $nums->@* - 1 ) {
+       next if $nums->@* % ( $_ + 1 ) != 0;
+       $sum += $nums->@[ $_ ] ** 2;    
+   }
+
+   return( $sum );
+$CODE$
+LANGUAGE plperl;
diff --git a/challenge-252/luca-ferrari/postgresql/ch-1.sql b/challenge-252/luca-ferrari/postgresql/ch-1.sql
new file mode 100644
index 0000000000..2e629884e7
--- /dev/null
+++ b/challenge-252/luca-ferrari/postgresql/ch-1.sql
@@ -0,0 +1,29 @@
+--
+-- Perl Weekly Challenge 252
+-- Task 1
+--
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-252/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc252;
+
+CREATE OR REPLACE FUNCTION
+pwc252.task1_plpgsql( nums int[] )
+RETURNS int
+AS $CODE$
+DECLARE
+	sumx int := 0;
+BEGIN
+
+	FOR i IN 1 .. array_length( nums, 1 ) LOOP
+	    IF mod( array_length( nums, 1 ), i ) <> 0 THEN
+	       CONTINUE;
+	    END IF;
+
+	    sumx := sumx + pow( nums[ i ], 2 );
+	END LOOP;
+
+	RETURN sumx;
+END
+$CODE$
+LANGUAGE plpgsql;
diff --git a/challenge-252/luca-ferrari/postgresql/ch-2.plperl b/challenge-252/luca-ferrari/postgresql/ch-2.plperl
new file mode 100644
index 0000000000..a7abf56217
--- /dev/null
+++ b/challenge-252/luca-ferrari/postgresql/ch-2.plperl
@@ -0,0 +1,37 @@
+--
+-- Perl Weekly Challenge 252
+-- Task 2
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-252/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc252;
+
+CREATE OR REPLACE FUNCTION
+pwc252.task2_plperl( int )
+RETURNS SETOF int
+AS $CODE$
+   my ( $size ) = @_;
+
+   die "Cannot have a size less than 3!" if ( $size <= 3 );
+
+   if ( $size % 2 == 0 ) {
+      for ( 1 .. $size / 2 ) {
+      	  return_next( $_ );
+	  return_next( $_ * -1 );
+      }
+   }
+   else {
+       for ( 1 .. ( $size - 1 ) / 2 ) {
+      	  return_next( $_ );
+	  return_next( $_ * -1 );
+      }
+
+      my $next = int( $size / 2 ) + 1;
+      return_next( $next );
+      return_next( $next + 1 );
+      return_next( ( $next + $next + 1 ) * -1 );
+   }
+
+return undef;
+$CODE$
+LANGUAGE plperl;
diff --git a/challenge-252/luca-ferrari/postgresql/ch-2.sql b/challenge-252/luca-ferrari/postgresql/ch-2.sql
new file mode 100644
index 0000000000..b97601e8fa
--- /dev/null
+++ b/challenge-252/luca-ferrari/postgresql/ch-2.sql
@@ -0,0 +1,41 @@
+--
+-- Perl Weekly Challenge 252
+-- Task 2
+--
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-252/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc252;
+
+CREATE OR REPLACE FUNCTION
+pwc252.task2_plpgsql( size int )
+RETURNS SETOF int
+AS $CODE$
+DECLARE
+	next_value int;
+BEGIN
+
+	IF size <= 3 THEN
+	   RAISE 'Cannot work with a size less than 3!';
+	END IF;
+
+	IF mod( size, 2 ) = 0 THEN
+	   FOR i IN 1 .. ( size / 2 ) LOOP
+	       RETURN NEXT i;
+	       RETURN NEXT (i * -1);
+	   END LOOP;
+	ELSE
+	    FOR i IN 2 .. ( size - 1 ) / 2  LOOP
+	       RETURN NEXT i;
+	       RETURN NEXT (i * -1);
+	   END LOOP;
+
+	   next_value := ( size - 1 ) / 2  + 1;
+	   RETURN NEXT next_value;
+	   RETURN NEXT next_value + 1;
+	   RETURN NEXT ( next_value + next_value + 1 ) * -1;
+	END IF;
+RETURN;
+END
+$CODE$
+LANGUAGE plpgsql;
diff --git a/challenge-252/luca-ferrari/python/ch-1.py b/challenge-252/luca-ferrari/python/ch-1.py
new file mode 100644
index 0000000000..cae2cc2c1c
--- /dev/null
+++ b/challenge-252/luca-ferrari/python/ch-1.py
@@ -0,0 +1,27 @@
+#!python
+
+#
+# Perl Weekly Challenge 252
+# Task 1
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-252/>
+#
+
+import sys
+
+# task implementation
+# the return value will be printed
+def main( argv ):
+    nums = list( map( int, argv ) )
+    sum = 0
+    for i in range( 0, len( nums ) ):
+        if len( nums ) % ( i + 1 ) == 0:
+            sum += nums[ i ] ** 2;
+
+    return sum
+
+
+# invoke the main without the command itself
+if __name__ == '__main__':
+    print( main( sys.argv[ 1: ] ) )
+
diff --git a/challenge-252/luca-ferrari/python/ch-2.py b/challenge-252/luca-ferrari/python/ch-2.py
new file mode 100644
index 0000000000..4862800e92
--- /dev/null
+++ b/challenge-252/luca-ferrari/python/ch-2.py
@@ -0,0 +1,39 @@
+#!python
+
+#
+# Perl Weekly Challenge 252
+# Task 2
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-252/>
+#
+
+import sys
+
+# task implementation
+# the return value will be printed
+def main( argv ):
+    size = int( argv[ 0 ] )
+    nums = []
+
+    if size % 2 == 0:
+        for i in range( 1, size / 2 ):
+            nums.append( i )
+            nums.append( i * -1 )
+    else:
+        for i in range( 1, int( ( size - 1 ) / 2 ) ):
+            nums.append( i )
+            nums.append( i * -1 )
+
+        next = max( nums ) + 1
+        nums.append( next )
+        nums.append( next + 1 )
+        nums.append( ( next + next + 1 ) * -1 )
+
+    return nums
+
+
+
+# invoke the main without the command itself
+if __name__ == '__main__':
+    print( main( sys.argv[ 1: ] ) )
+
diff --git a/challenge-252/luca-ferrari/raku/ch-1.p6 b/challenge-252/luca-ferrari/raku/ch-1.p6
new file mode 100644
index 0000000000..3dbb8a96cc
--- /dev/null
+++ b/challenge-252/luca-ferrari/raku/ch-1.p6
@@ -0,0 +1,12 @@
+#!raku
+
+#
+# Perl Weekly Challenge 252
+# Task 1
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-252/>
+#
+
+sub MAIN( *@nums where { @nums.elems == @nums.grep( * ~~ Int ).elems } ) {
+    @nums.kv.map( { @nums.elems %% ( $^index + 1 ) ?? $^value ** 2 !! 0  } ).sum.say;
+}
diff --git a/challenge-252/luca-ferrari/raku/ch-2.p6 b/challenge-252/luca-ferrari/raku/ch-2.p6
new file mode 100644
index 0000000000..952e96e397
--- /dev/null
+++ b/challenge-252/luca-ferrari/raku/ch-2.p6
@@ -0,0 +1,23 @@
+#!raku
+
+#
+# Perl Weekly Challenge 252
+# Task 2
+#
+# See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-252/>
+#
+
+sub MAIN( $n where { $n >= 3 && $n ~~ Int  } ) {
+    my @nums;
+
+    if $n %% 2 {
+	@nums.push: $_, $_ * -1 for 1 .. ( $n / 2 );
+    }
+    else {
+	@nums.push: $_, $_ * -1 for 1 .. ( ( $n - 2 ) / 2 );
+	my $next = @nums.max + 1;
+	@nums.push: $next, $next + 1, ( $next + $next + 1 ) * -1;
+    }
+
+    @nums.join( ',' ).say;
+}