移动零 python

给定一个数组 nums，编写一个函数将所有 0 移动到数组的末尾，同时保持非零元素的相对顺序。

示例:

输入: [0,1,0,3,12]
输出: [1,3,12,0,0]

说明:

1. 必须在原数组上操作，不能拷贝额外的数组。
2. 尽量减少操作次数。

• 执行用时为 36 ms 的范例

class Solution(object):
    def moveZeroes(self, nums):
        """
        :type nums: List[int]
        :rtype: void Do not return anything, modify nums in-place instead.
        """
        
        n = len(nums)
        z = 0
        i = 0
        while i + z < n:
            if nums[i] == 0:
                z += 1
                del nums[i]
            else:
                i += 1
        while z > 0:
            nums.append(0)
            z -= 1

• 执行用时为 40 ms 的范例

class Solution(object):
    def moveZeroes(self, nums):
        """
        :type nums: List[int]
        :rtype: void Do not return anything, modify nums in-place instead.
        """
        j = 0
        for i in range(len(nums)):
            if nums[i] !=0:
                nums[j], nums[i] = nums[i], nums[j]
                j +=1

最多提交

• 执行用时为 44 ms 的范例

class Solution(object):
    def moveZeroes(self, nums):
        """
        :type nums: List[int]
        :rtype: void Do not return anything, modify nums in-place instead.
        """
        total = len(nums)
        none_zero = 0

        for i in nums:
            if i == 0:
                continue
            nums[none_zero] = i
            none_zero += 1

        for i in range(none_zero, total, 1):
            nums[i] = 0

• 48ms

class Solution(object):
    def moveZeroes(self, nums):
        """
        :type nums: List[int]
        :rtype: void Do not return anything, modify nums in-place instead.
        """
        length = len(nums)
        i = 0
        j = 0
        while i < length and j < length:
            if  nums[i] != 0:
                i += 1
                j = max(i, j)
            elif nums[j] == 0:
                j += 1
            else:
                nums[i], nums[j] = nums[j], nums[i]