80. 删除排序数组中的重复项 II

class Solution 
{
public:
    int removeDuplicates(vector<int>& nums) 
    {
        int j = 0;
        for(int i = 0;i < nums.size();i ++)
        {
            if(j < 2 || nums[i] > nums[j - 2])
            {
                nums[j++] = nums[i];
            }
        }
        return j;
    }
};