PWC 251

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

4 files changed, 131 insertions, 0 deletions

diff --git a/challenge-251/luca-ferrari/postgresql/ch-1.plperl b/challenge-251/luca-ferrari/postgresql/ch-1.plperl
new file mode 100644
index 0000000000..7152e60c8a
--- /dev/null
+++ b/challenge-251/luca-ferrari/postgresql/ch-1.plperl
@@ -0,0 +1,23 @@
+--
+-- Perl Weekly Challenge 251
+-- Task 1
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-251/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc251;
+
+CREATE OR REPLACE FUNCTION
+pwc251.task1_plperl( int[] )
+RETURNS int
+AS $CODE$
+   my ( $nums ) = @_;
+   my $sum = 0;
+   
+   for  ( 0 .. $nums->@* - 2 ) {
+	next if $_ % 2 != 0;
+        $sum += $nums->@[ $_ ] . $nums->@[ $_ + 1 ];
+   }
+
+   return $sum;
+$CODE$
+LANGUAGE plperl;
diff --git a/challenge-251/luca-ferrari/postgresql/ch-1.sql b/challenge-251/luca-ferrari/postgresql/ch-1.sql
new file mode 100644
index 0000000000..83c215c5f6
--- /dev/null
+++ b/challenge-251/luca-ferrari/postgresql/ch-1.sql
@@ -0,0 +1,29 @@
+--
+-- Perl Weekly Challenge 251
+-- Task 1
+--
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-251/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc251;
+
+CREATE OR REPLACE FUNCTION
+pwc251.task1_plpgsql( nums int[] )
+RETURNS int
+AS $CODE$
+DECLARE
+	s text;
+	v int := 0;
+BEGIN
+	FOR i IN 1 .. array_length( nums, 1 ) - 1 LOOP
+	    IF i % 2 = 0 THEN
+	       CONTINUE;
+	    END IF;
+
+	    v := v + ( nums[ i ]::text || nums[ i + 1 ]::text )::int;
+	END LOOP;
+
+	RETURN v;
+END
+$CODE$
+LANGUAGE plpgsql;
diff --git a/challenge-251/luca-ferrari/postgresql/ch-2.plperl b/challenge-251/luca-ferrari/postgresql/ch-2.plperl
new file mode 100644
index 0000000000..32d43ba6ef
--- /dev/null
+++ b/challenge-251/luca-ferrari/postgresql/ch-2.plperl
@@ -0,0 +1,63 @@
+--
+-- Perl Weekly Challenge 251
+-- Task 2
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-251/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc251;
+
+/**
+ * example
+ testdb=> select pwc251.task2_plperl( array[ [ 3,  7,  8],
+                   [ 9, 11, 13],
+                   [15, 16, 17]] );
+ task2_plperl 
+--------------
+           15
+(1 row)
+*/
+CREATE OR REPLACE FUNCTION
+pwc251.task2_plperl( int[][] )
+RETURNS int
+AS $CODE$
+   my ( $matrix ) = @_;
+
+   my $max_col = undef;
+
+   # search the max column value
+   my @max_col_indexes;
+   for my $col ( 0 .. $matrix->@[ 0 ]->@* - 1 ) {
+       $max_col_index[ $col ] = undef;
+
+       for my $row ( 0 .. $matrix->@* - 1 ) {
+       	   $max_col_index[ $col ] = $matrix->@[ $row ]->[ $col ] if ( ! $max_col_index[ $col ] || $max_col_index[ $col ] < $matrix->@[ $row ]->[ $col ] );
+       }
+   }
+   for my $row ( 0 .. $matrix->@* - 1 ) {
+       for my $col ( 0 .. $matrix->@[ $row ]->@* - 1 ) {
+       	   $max_col = $matrix->@[ $row ]->[ $col ] if ( ! $max_col || $max_col < $matrix->@[ $row ]->[ $col ] );
+       }
+   }
+
+  for my $row ( 0 .. $matrix->@* - 1 ) {
+      my $current_min = undef;
+      my $current_min_index = 0;
+      
+     for my $col ( 0 .. $matrix->@[ $row ]->@* - 1 ) {
+     	 if ( ! $current_min || $matrix->@[ $row ]->[ $col ] < $current_min ) {
+	    $current_min = $matrix->@[ $row ]->[ $col ];
+	    $current_min_index = $col;
+	 }
+     }
+
+     if ( $current_min == $max_col_index[ $current_min_index ] ) {
+     	return $current_min;
+     }
+
+
+  }
+
+  return -1;
+
+$CODE$
+LANGUAGE plperl;
diff --git a/challenge-251/luca-ferrari/postgresql/ch-2.sql b/challenge-251/luca-ferrari/postgresql/ch-2.sql
new file mode 100644
index 0000000000..fcdf6a6f9a
--- /dev/null
+++ b/challenge-251/luca-ferrari/postgresql/ch-2.sql
@@ -0,0 +1,16 @@
+--
+-- Perl Weekly Challenge 251
+-- Task 2
+--
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-251/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc251;
+
+CREATE OR REPLACE FUNCTION
+pwc251.task2_plpgsql( matrix int[][] )
+RETURNS int
+AS $CODE$
+   SELECT pwc251.task2_plperl( matrix );
+$CODE$
+LANGUAGE sql;