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-- Perl Weekly Challenge 163
-- Task 2
CREATE SCHEMA IF NOT EXISTS pwc163;
CREATE OR REPLACE FUNCTION
pwc163.task2_reduce( n int[] )
RETURNS int[]
AS $CODE$
DECLARE
summy int;
index int;
res int[];
BEGIN
FOR index IN 2 .. array_length( n, 1 ) LOOP
IF index = 2 THEN
res := array_append( res, n[ index ] );
ELSE
res := array_append( res, n[ index ] + res[ array_length( res, 1 ) ] );
END IF;
END LOOP;
RETURN res;
END
$CODE$
LANGUAGE plpgsql;
CREATE OR REPLACE FUNCTION
pwc163.task2_plpgsql( n int[] )
RETURNS int
AS $CODE$
DECLARE
BEGIN
WHILE array_length( n, 1 ) > 1 LOOP
n := pwc163.task2_reduce( n );
END LOOP;
RETURN n[ 1 ];
END
$CODE$
LANGUAGE plpgsql;
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