from typing import List


def removeDuplicates(nums: List[int]):
    # 暴力解法
    lens = len(nums)
    # i = 0
    # while i < lens-1:
    #     if nums[i] == nums[i + 1]:
    #         nums.remove(nums[i])
    #         lens -= 1
    #         while i != 0:
    #             i -= 1
    #     else:
    #         i += 1
    # return len(nums)

    # 快慢指针法
    if not nums:
        return 0

    slow = 1
    for fast in range(1,lens):
        if nums[fast] != nums[fast - 1]:
            nums[slow] = nums[fast]
            slow += 1
    return slow


print(removeDuplicates([0, 0, 1, 1, 2, 3, 3]))