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;

}
};