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ljxpython
test_engineer
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"""
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。
请注意 ,必须在不复制数组的情况下原地对数组进行操作。
示例 1:
输入: nums = [0,1,0,3,12]
输出: [1,3,12,0,0]
示例 2:
输入: nums = [0]
输出: [0]
提示:
1 <= nums.length <= 104
-231 <= nums[i] <= 231 - 1
进阶:你能尽量减少完成的操作次数吗?
"""
def moveZeroes( nums):
"""
:type nums: List[int]
:rtype: None Do not return anything, modify nums in-place instead.
"""
# 我个人的想法,检测到0就两两互换,换到后面
n = len(nums)
right = n -1
for i in range(n):
if nums[i] == 0:
j = i
while j < right:
nums[j],nums[j+1] = nums[j+1],nums[j]
j +=1
right -= 1
return nums
# 这道题遇到快慢指针,而且不改变非0顺序的解法
# 其实是当遇到非零,且快慢指针不相等时就移动一下位置
# 快慢指针不等于零,且索引相等,那么就不动
# 快指针等于零,此时快慢指针不相等,那么调换快慢指针位置
# 其实如果快慢指针不相等,相当于慢指针其实是在零的位置停留,不知道你理解不理解
def other_main(nums:list[int]):
slow = 0
for fast in range(len(nums)):
if nums[fast] != 0: # 只要不是0就处理
if slow != fast: # 只有位置不同时才需要交换,因为
nums[slow],nums[fast] = nums[fast],nums[slow]
slow +=1 # 无论是否交换,slow都应该前进
return nums
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