CHALLENGE ACTIVITY

$7\mathrm{.}4\mathrm{.}3$: Compute the distance between element positions.

$541664\mathrm{.}3809148.$qx$3$zqy$7$

Compute the distance between the positions of the first and last zero element in the given array. For example, if the array is $301049506$ your algorithm should yield $7-1=6.$

If the array contains a single zero, return $0.$ If it doesn't contain any zeroes, return a negative value.