Count Sign Changes
Ignoring zeros, count how many times consecutive remaining values change sign (positive to negative or vice versa).
Input: the first line has an integer N; the second line has N integers separated by spaces.
Output: one integer — the number of sign changes after removing zeros.
Constraints:
- 1 ≤ N ≤ 2000
- −109 ≤ ai ≤ 109
Sample Tests
Input 1
6 3 -2 0 -5 4 1
Output 1
2
Input 2
3 0 0 0
Output 2
0
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