80. Remove Duplicates from Sorted Array II

class Solution(object):
    def removeDuplicates(self, nums):
        """
        :type nums: List[int]
        :rtype: int
        """
        
        n=len(nums)
        if n<3:
            return 
            
        count=1
        pointer=0
        while pointer<n-1:
            pointer+=1
            if nums[pointer]==nums[pointer-1] and count!=0:
                count-=1
            elif nums[pointer]==nums[pointer-1] and count==0:
                nums.pop(pointer)
                n-=1
                pointer-=1
            else:
                count=1