import stdlib.StdOut;

import java.util.$*$; $//$ for comparing arrays in main$()$ tests only

class HW$1\{$

$/*$

$*$ Sum the values of the array.

$*$ Be careful, the array may have length $0.$ In this case, sum should return $0$

$*$

$*/$

public static double sum $($double$[]$ a$)\{$

$//$ TODO

return StdRandom.uniform $()$;

$\}$