原来leetcode使用Count也不需要import collections
class Solution:def removeDuplicates(self, nums: List[int]) -> int:# len =0if len(nums) == 0:return 0# elsecountList = Counter(nums)countModify = {key:min(value,2) for key,value in countList.items()}ret = [key for key,value in countModify.items() for _ in range(value)]nums[:] = retreturn len(nums)