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--
-- Perl Weekly Challenge 268
-- Task 1
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-268>
--
CREATE SCHEMA IF NOT EXISTS pwc268;
CREATE OR REPLACE FUNCTION
pwc268.task1_plpgsql( l int[], r int[] )
RETURNS int
AS $CODE$
WITH sorted_left AS ( SELECT v, row_number() OVER ( order by 1 ) as r FROM unnest( l ) v )
, sorted_right AS ( SELECT v, row_number() OVER ( order by 1 ) as r FROM unnest( r ) v )
, diffs AS (
SELECT l.v - r.v as d
FROM sorted_left l, sorted_right r
WHERE l.r = r.r
)
SELECT d
FROM diffs d
GROUP BY d
HAVING count(*) = ( SELECT array_length( l, 1 ) );
$CODE$
LANGUAGE sql;
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