删除排序数组中的重复数字

class Solution {
public:
    /**
     * @param A: a list of integers
     * @return : return an integer
     */
    int removeDuplicates(vector<int> &nums) {
        // write your code here
       int i = 0;
        if(!nums.size())
            return 0;
        for (int j = 1; j < nums.size(); ++j) {
            if (nums[j] != nums[i]) {
                nums[++i] = nums[j];
            }
        }   
        return i+1;
    }
};