PWC 262

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

3 files changed, 135 insertions, 3 deletions

diff --git a/challenge-262/luca-ferrari/pljava/pom.xml b/challenge-262/luca-ferrari/pljava/pom.xml
index d05bdc8222..d227373f13 100644
--- a/challenge-262/luca-ferrari/pljava/pom.xml
+++ b/challenge-262/luca-ferrari/pljava/pom.xml
@@ -7,14 +7,14 @@
 
   <groupId>PWC</groupId>
   <artifactId>
-    PWC261
+    PWC262
   </artifactId>
   <version>
     1
   </version>
 
-  <name>Perl Weekly Challenge 261 with package PWC261</name>
-  <description>Implementation of the tasks in PL/Java for PWC 261</description>
+  <name>Perl Weekly Challenge 262 with package PWC262</name>
+  <description>Implementation of the tasks in PL/Java for PWC 262</description>
 
   <properties>
     <project.build.sourceEncoding>US-ASCII</project.build.sourceEncoding>
diff --git a/challenge-262/luca-ferrari/pljava/src/main/java/Task1.java b/challenge-262/luca-ferrari/pljava/src/main/java/Task1.java
new file mode 100644
index 0000000000..02e1474d67
--- /dev/null
+++ b/challenge-262/luca-ferrari/pljava/src/main/java/Task1.java
@@ -0,0 +1,66 @@
+
+
+
+package PWC262;
+
+/**
+ * PL/Java implementation for PWC 262
+ * Task 1
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-262>
+ *
+ *
+ * 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/PWC262-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC262-1.jar', 'PWC262', true );
+ select sqlj.set_classpath( 'public', 'PWC262' );
+
+ select pwc262.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC262-1.jar', 'PWC262', 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 = "pwc262",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final int task1_pljava( int[] nums ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc262.task1_pljava" );
+
+	int positives = 0;
+	int negatives = 0;
+
+	for ( int current : nums )
+	    if ( current >= 0 )
+		positives++;
+	    else
+		negatives++;
+
+	return positives >= negatives ? positives : negatives;
+
+    }
+}
diff --git a/challenge-262/luca-ferrari/pljava/src/main/java/Task2.java b/challenge-262/luca-ferrari/pljava/src/main/java/Task2.java
new file mode 100644
index 0000000000..0260bb29b3
--- /dev/null
+++ b/challenge-262/luca-ferrari/pljava/src/main/java/Task2.java
@@ -0,0 +1,66 @@
+
+
+
+package PWC262;
+
+/**
+ * PL/Java implementation for PWC 262
+ * Task 2
+ * See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-262>
+ *
+ *
+ * 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/PWC262-1.jar  luca@rachel:/tmp
+
+
+ * To install into PostgreSQL execute:
+
+ select sqlj.install_jar( 'file:///tmp/PWC262-1.jar', 'PWC262', true );
+ select sqlj.set_classpath( 'public', 'PWC262' );
+
+ select pwc262.task2_pljava();
+
+ and then to redeploy:
+
+ select sqlj.replace_jar( 'file:///tmp/PWC262-1.jar', 'PWC262', 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 = "pwc262",
+	       onNullInput = RETURNS_NULL,
+	       effects = IMMUTABLE )
+    public static final int task2_pljava( int k, int[] nums ) throws SQLException {
+	logger.log( Level.INFO, "Entering pwc262.task2_pljava" );
+
+	int pairs = 0;
+	for ( int i = 0; i < nums.length; i++ )
+	    for ( int j = i + 1; j < nums.length; j++ )
+		if ( nums[ i ] != nums[ j ]
+		     || ( i * j ) % k != 0 )
+		    continue;
+		else
+		    pairs++;
+
+	return pairs;
+
+    }
+}