* Add <cstdlib> header for later cpp compatibility.
Signed-off-by: Mike Inouye <mikeinouye@google.com>
* Add include comment and use <cmath> for abs instead.
Signed-off-by: Mike Inouye <mikeinouye@google.com>
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Signed-off-by: Mike Inouye <mikeinouye@google.com>