力扣 移动零

https://leetcode.cn/problems/move-zeroes/description/

思路

双指针法，定义两个指针 l r ，它们维护了一段元素都是0的区间nums[l:r]

	nums[l] == 0	nums[l] != 0
nums[r] == 0	r+=1	不存在
nums[r] != 0	swap;l+=1;r+=1	l+=1;r+=1

class Solution:
    def moveZeroes(self, nums: List[int]) -> None:
        l = 0
        for r in range(len(nums)):
            if nums[r] != 0:
                if nums[l] == 0:
                    nums[l], nums[r] = nums[r], nums[l]
                l += 1