water

class Solution {

public:

    int removeDuplicates(vector<int>& nums) {

        for(vector<int>::iterator it=nums.begin();it!=nums.end();)

        {

            int cur=*it;

            it++;

            while(it != nums.end() && *it == cur)nums.erase(it);

        }

        return nums.size();

    }

};