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+--
+-- Perl Weekly Challenge 322
+-- Task 2
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-322>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc322;
+
+CREATE OR REPLACE FUNCTION
+pwc322.task2_plpgsql( n int[] )
+RETURNS SETOF int
+AS $CODE$
+DECLARE
+   current int;
+   r       int;
+BEGIN
+
+	FOR current IN SELECT x FROM unnest( n ) x LOOP
+	    WITH sorting AS (
+	    	 SELECT row_number() over ( order by y ) as sorted, y
+		 FROM   unnest( n ) y
+	    )
+	    SELECT sorted
+	    INTO r
+	    FROM sorting
+	    WHERE y = current;
+
+	    RETURN NEXT r;
+
+	END LOOP;
+
+END
+$CODE$
+LANGUAGE plpgsql;