Remove Duplicates from Sorted Array II

Follow up for "Remove Duplicates":
What if duplicates are allowed at most twice?

For example,
Given sorted array A = [1,1,1,2,2,3],

Your function should return length = 5, and A is now [1,1,2,2,3].

int removeDuplicates(int A[], int n) {
	if (n == 1)
		return 1;
	int last = A[0];
	int count = 0;
	int Dup_count = 1;
	for (int cur = 1; cur < n; ++cur)
	{
		if (A[cur] == last){
			if (Dup_count >= 2)
				count++;
			else
				A[cur - count] = A[cur];
			Dup_count++;
		}
		else
		{
			Dup_count = 1;
			last = A[cur];
			A[cur - count] = A[cur];
		}
	}
	return n - count;
}