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-- Perl Weekly Challenge 196
-- Task 2
CREATE SCHEMA IF NOT EXISTS pwc196;
CREATE OR REPLACE FUNCTION
pwc196.task2_plpgsql( l int[])
RETURNS SETOF int[]
AS $CODE$
DECLARE
c_start int := 0;
c_end int := 0;
BEGIN
FOR i IN 0 .. array_length( l, 1 ) LOOP
IF i < c_end THEN
CONTINUE;
END IF;
c_start := i;
c_end := c_start;
WHILE c_end < array_length( l, 1 ) AND l[ c_end + 1 ] = l[ c_end ] + 1 LOOP
c_end := c_end + 1;
END LOOP;
IF c_start < c_end THEN
RETURN NEXT ARRAY[ c_start, c_end ]::int[];
END IF;
END LOOP;
RETURN;
END
$CODE$
LANGUAGE plpgsql;
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