LeetCode26. 删除排序数组中的重复项

class Solution {
    public int removeDuplicates(int[] nums) {
        if (nums == null || nums.length == 0) return 0;
        int index = 0;
        for (int i = 0; i < nums.length; i++) {
            if (nums[i] != nums[index]) {
                nums[++index] = nums[i];
            }
        }
        return index+1;
    }
}