输入: [0,1,0,3,12]
输出: [1,3,12,0,0]

class Solution:
    def moveZeroes(self, nums: List[int]) -> None:
        """
        Do not return anything, modify nums in-place instead.
        """
        count_flags = 0
        while 0 in nums:
            count_flags += 1
            nums.pop(nums.index(0))
        nums.extend([0 for _ in range(count_flags)])