leetcode:删除排序数组中的重复项

class :
    def removeDuplicates(self, nums: List[int]) -> int:
        if (len(nums) == 0):
            return 0
        i = 0
        for j in range(1,len(nums)):
            if nums[j] != nums[i]:
                i+=1
                nums[i] = nums[j]
      
        return i + 1