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--
-- Perl Weekly Challenge 258
-- Task 2
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-258>
--
CREATE SCHEMA IF NOT EXISTS pwc258;
CREATE OR REPLACE FUNCTION
pwc258.task2_plpgsql( k int, nums int[] )
RETURNS int
AS $CODE$
DECLARE
v_sum int := 0;
count_of_ones int := 0;
BEGIN
FOR i IN 1 .. array_length( nums, 1 ) LOOP
SELECT sum( v::int )
INTO count_of_ones
FROM regexp_split_to_table( i::bit( 8 )::text, '' ) v;
IF count_of_ones <> k THEN
continue;
END IF;
v_sum := v_sum + nums[ i ];
END LOOP;
RETURN v_sum;
END
$CODE$
LANGUAGE plpgsql;
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