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--
-- Perl Weekly Challenge 200
-- Task 1
--
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-200/>
--
CREATE SCHEMA IF NOT EXISTS pwc200;
CREATE OR REPLACE FUNCTION
pwc200.task1_plpgsql( list int[] )
RETURNS SETOF int[]
AS $CODE$
DECLARE
BEGIN
FOR i IN 2 .. array_length( list, 1 ) - 1 LOOP
IF list[ i + 1 ] - list [ i ] = list[ i ] - list[ i - 1 ] THEN
RETURN NEXT array[ list[ i - 1 ], list[ i ], list[ i + 1 ] ];
END IF;
END LOOP;
RETURN;
END
$CODE$
LANGUAGE plpgsql;
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