[leetcode]Remove Duplicates from Sorted Array II

简单题，但也思考了一会。就是pos标志下一个要写入的位置，而current标志下一个可以写入的内容。

public class Solution {
    public int removeDuplicates(int[] A) {
    	if (A.length == 0 || A.length == 1) return A.length;
        int pos = 0;
		int current = 0; 
		boolean encounted = false;
		while (current < A.length)
		{
			if (current == 0 || A[current] != A[current-1])
			{
				A[pos] = A[current];
				pos++;
				current++;
				encounted = false;
			}
			else // A[current] == A[current-1]
			{
				if (!encounted)
				{
					A[pos] = A[current];
					pos++;
					current++;
					encounted = true;
				}
				else
				{
					current++;
				}
			}
		}
		return pos;
    }
}