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-- Perl Weekly Challenge 196
-- Task 1
CREATE SCHEMA IF NOT EXISTS pwc196;
CREATE OR REPLACE FUNCTION
pwc196.task1_plpgsql( l int[] )
RETURNS SETOF int[]
AS $CODE$
DECLARE
last_index int := 0;
BEGIN
FOR i IN 1 .. array_length(l,1) - 1 LOOP
IF i <= last_index THEN
CONTINUE;
END IF;
IF l[ i - 1 ] < l[ i ] AND l[ i ] < l[ i + 1 ] THEN
RETURN NEXT ARRAY[ l[i-1], l[i], l[i + 1] ]::int[];
last_index := i + 1;
END IF;
END LOOP;
RETURN;
END
$CODE$
LANGUAGE plpgsql;
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