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--
-- Perl Weekly Challenge 204
-- Task 1
--
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-204/>
--
CREATE SCHEMA IF NOT EXISTS pwc204;
CREATE OR REPLACE FUNCTION
pwc204.task1_plpgsql( l int[] )
RETURNS int
AS $CODE$
DECLARE
monotonic_mode bool;
i int;
BEGIN
FOR i IN 2 .. array_length( l, 1 ) LOOP
IF l[ i ] = l[ i - 1 ] THEN
CONTINUE;
END IF;
IF monotonic_mode IS NULL THEN
IF l[ i ] > l[ i - 1 ] THEN
monotonic_mode := true;
ELSE
monotonic_mode := false;
END IF;
END IF;
IF monotonic_mode AND l[ i ] < l[ i - 1 ] THEN
RETURN 0;
END IF;
IF NOT monotonic_mode AND l[ i ] > l[ i - 1 ] THEN
RETURN 0;
END IF;
END LOOP;
RETURN 1;
END
$CODE$
LANGUAGE plpgsql;
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