Remove Duplicates from Sorted Array

class Solution {
public:
    int removeDuplicates(vector<int>& nums) {
        vector<int>new_nums;
        int s = nums.size();
        int len=0;
        for(int i=0;i<s;){    //注意：1，不能写c++ 2，i<s,而不是nums[i]
            int temp = nums[i];
            i++;
            len++;
            new_nums.push_back(nums[i-1]);
            while(nums[i] == temp){
                i++;
            }
        }
        nums.clear();
        nums = new_nums;
        return len;
        
    }
};