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+--
+-- Perl Weekly Challenge 236
+-- Task 2
+--
+-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-236/>
+--
+
+CREATE SCHEMA IF NOT EXISTS pwc236;
+
+CREATE OR REPLACE FUNCTION
+pwc236.task2_plpgsql( nums int[] )
+RETURNS int
+AS $CODE$
+DECLARE
+	current_start int;
+	loops int := 0;
+	next int;
+BEGIN
+
+	FOR current_start in 1 .. array_length( nums, 1 ) LOOP
+		next := nums[ current_start ];
+
+		WHILE next >= 1 AND next <= array_length( nums, 1 ) LOOP
+		      IF nums[ next ] = current_start THEN
+		      	 loops := loops + 1;
+			 EXIT;
+		      END IF;
+
+		      next := nums[ next ];
+		END LOOP;
+	END LOOP;
+
+	RETURN loops;
+END
+
+$CODE$
+LANGUAGE plpgsql;