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--
-- Perl Weekly Challenge 215
-- Task 2
--
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-215/>
--
CREATE SCHEMA IF NOT EXISTS pwc215;
CREATE OR REPLACE FUNCTION
pwc215.task2_plpgsql( c int, digits int[] )
RETURNS boolean
AS $CODE$
DECLARE
done boolean;
i int;
BEGIN
i := 2;
WHILE c > 0 LOOP
done := false;
WHILE i < array_length( digits, 1 ) LOOP
IF digits[ i ] = 0 AND digits[ i - 1 ] = 0 AND digits[ i + 1 ] = 0 THEN
digits[ i ] := 1;
done := true;
c := c - 1;
EXIT;
END IF;
i := i + 1;
END LOOP;
IF NOT done THEN
EXIT;
END IF;
END LOOP;
IF c = 0 THEN
RETURN true;
ELSE
RETURN false;
END IF;
END
$CODE$
LANGUAGE plpgsql;
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