Absolute distinct count in a sorted array

Given a sorted array of integers, return the number of distinct absolute values among the elements of the array. The input can contain duplicates values.

Input: [-3, -2, 0, 3, 4, 5]
Output: 5
There are 5 distinct absolute values
among the elements of this array, i.e.
0, 2, 3, 4 and 5)

Input:  [-1, -1, -1, -1, 0, 1, 1, 1, 1]
Output: 2

Input:  [-1, -1, -1, -1, 0]
Output: 2

Input:  [0, 0, 0]
Output: 1 

http://www.geeksforgeeks.org/absolute-distinct-count-array-sorted-absolute-values/