Remove Duplicates from Sorted Array II

class Solution {public:    int removeDuplicates(vector<int>& nums)     {        const int n=nums.size();        if(0==n)            return 0;        int temp=nums[0];        int length=0;        for(int i=1;i<n;++i)        {            if(nums[i]==temp)                ++length;            else            {                nums[i-length]=nums[i];                temp=nums[i];            }        }                return n-length;            }};