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--
-- Perl Weekly Challenge 252
-- Task 2
-- See <https://perlweeklychallenge.org/blog/perl-weekly-challenge-252/>
--
CREATE SCHEMA IF NOT EXISTS pwc252;
CREATE OR REPLACE FUNCTION
pwc252.task2_plperl( int )
RETURNS SETOF int
AS $CODE$
my ( $size ) = @_;
die "Cannot have a size less than 3!" if ( $size <= 3 );
if ( $size % 2 == 0 ) {
for ( 1 .. $size / 2 ) {
return_next( $_ );
return_next( $_ * -1 );
}
}
else {
for ( 1 .. ( $size - 1 ) / 2 ) {
return_next( $_ );
return_next( $_ * -1 );
}
my $next = int( $size / 2 ) + 1;
return_next( $next );
return_next( $next + 1 );
return_next( ( $next + $next + 1 ) * -1 );
}
return undef;
$CODE$
LANGUAGE plperl;
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