101. 删除排序数组中的重复数字 II

int removeDuplicates(vector<int> &nums) {
        if(nums.empty())
        return 0;
        int i=1;
        int j=0;
        int flag=1;
        for(;i<nums.size();i++)
        {
            if(nums[i]!=nums[j])
            {
                cout<<nums[i]<<" ";
                nums[j+1]=nums[i];
                j++;
                
    
                flag=1;
            }
            else if(nums[i]==nums[j])
            {
                if(flag>=2)
                 continue;
                else
                {
                    nums[j+1]=nums[i];
                    j++;
                    flag++;
                }
                
            }
        }
        nums.reserve(j+1);
        return j+1;
        // write your code here
    }