80. Remove Duplicates from Sorted Array II (Array)

Follow up for "Remove Duplicates":
What if duplicates are allowed at most twice?

For example,
Given sorted array nums = [1,1,1,2,2,3],

Your function should return length = 5, with the first five elements of nums being 1, 1, 2, 2 and 3. It doesn't matter what you leave beyond the new length.

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