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--
-- Perl Weekly Challenge 262
-- Task 2
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-262>
--
CREATE SCHEMA IF NOT EXISTS pwc262;
CREATE OR REPLACE FUNCTION
pwc262.task2_plpgsql( k int, nums int[] )
RETURNS int
AS $CODE$
DECLARE
pairs_count int := 0;
BEGIN
FOR i IN 1 .. array_length( nums, 1 ) LOOP
FOR j IN ( i + 1 ) .. array_length( nums, 1 ) LOOP
IF nums[ i ] <> nums[ j ] THEN
CONTINUE;
END IF;
IF mod( i * j, k ) <> 0 THEN
CONTINUE;
END IF;
pairs_count := pairs_count + 1;
END LOOP;
END LOOP;
RETURN pairs_count;
END
$CODE$
LANGUAGE plpgsql;
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