You got your odd/even mixed up. The first element is at index 0, which is even. Also, enter splice and statement modifiers.
while( @array ) {
my ( $even, $odd ) = splice @array, 0, 2;
push @odd, $odd if defined $odd;
push @even, $even if defined $even;
}
It is worth noting that this would be buggy if the list could possibly have undefs in it (not the case here; but I'd put a comment to that effect in the code).
Obscure trickery for the fun of reducing it further, but don't do this at home:
( $even[ @even ], $odd[ @odd ] ) = splice @array, 0, 2 while @array;
Makeshifts last the longest.
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