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力扣算法笔试题复习:【字串】滑动窗口最大值

力扣算法笔试题复习:【字串】滑动窗口最大值

AI 横行的时代,算法岗依然需要现场 coding 的能力,该栏目将持续分享力扣原题。温故而知新,既然刷到了,就停下来复习一下再划走吧。

239. 滑动窗口最大值

给定一个整数数组 nums,一个大小为 k 的滑动窗口从数组最左侧开始,每次向右移动一个位置。题目要求返回每个窗口中的最大值。

例如,输入 nums = [1, 3, -1, -3, 5, 3, 6, 7]k = 3,窗口移动过程如下:

  • [1, 3, -1],最大值为 3
  • [3, -1, -3],最大值为 3
  • [-1, -3, 5],最大值为 5
  • [-3, 5, 3],最大值为 5
  • [5, 3, 6],最大值为 6
  • [3, 6, 7],最大值为 7

因此最终返回 [3, 3, 5, 5, 6, 7]

这道题的难点不在于计算一个窗口的最大值,而在于窗口移动以后,如何快速得到新窗口的最大值。如果每次都重新遍历窗口,需要 O(k) 的时间;而使用单调队列,可以把每次移动的均摊成本降到 O(1)。

第一种:逐个窗口查找最大值(会超时)

最直接的做法是枚举每个长度为 k 的窗口,然后使用 max 找出窗口内的最大值。

from typing import List


classSolution:
defmaxSlidingWindow(self, nums: List[int], k: int) -> List[int]:
        window_maximums = []
        array_length = len(nums)

for window_start in range(array_length - k + 1):
            window_end = window_start + k
            current_maximum = max(nums[window_start:window_end])
            window_maximums.append(current_maximum)

return window_maximums

长度为 n 的数组中,一共有 n-k+1 个窗口。每个窗口都要截取 k 个元素并寻找最大值,因此时间复杂度为 O((n-k+1)k),通常可以简化为 O(nk)。

这种方法逻辑简单,但相邻窗口之间存在大量重复计算。比如窗口从 [1, 3, -1] 移动到 [3, -1, -3] 时,元素 3 和 -1 仍然留在窗口中,却被重新比较了一遍。

时间复杂度 O(nk),空间复杂度 O(k)。如果不计算切片产生的临时空间,则额外空间为 O(1)。

第二种:单调队列(推荐写法)

要减少重复计算,需要在窗口移动时保留仍然有效的最大值候选。这里可以使用一个从队首到队尾对应元素值单调不增的双端队列。

队列中不直接保存元素值,而是保存它们在数组中的下标。这样既能通过 nums[index] 比较大小,也能判断队首元素是否已经离开当前窗口。

from typing import List
from collections import deque


classSolution:
defmaxSlidingWindow(self, nums: List[int], k: int) -> List[int]:
        window_maximums = []
        candidate_indices = deque()

for current_index in range(len(nums)):
# 移除队尾所有小于当前元素的候选
while (
                candidate_indices
and nums[candidate_indices[-1]] < nums[current_index]
            ):
                candidate_indices.pop()

            candidate_indices.append(current_index)

# 移除已经离开当前窗口的队首下标
            window_left = current_index - k + 1
if candidate_indices[0] < window_left:
                candidate_indices.popleft()

# 窗口形成后,队首就是当前窗口最大值
if current_index >= k - 1:
                maximum_index = candidate_indices[0]
                window_maximums.append(nums[maximum_index])

return window_maximums

这段代码主要完成三件事:维护单调性、删除过期元素,以及读取窗口最大值。

1. 为什么要从队尾删除较小元素

处理 nums[current_index] 时,如果队尾下标对应的元素比当前元素小,就将它从队列中删除。

原因是当前元素同时具备两个优势:

  • 当前元素更大;
  • 当前元素的位置更靠右,因此会更晚离开窗口。

例如,当前队列对应的元素是 [5, 3],新元素是 6。在后续包含 6 的窗口中,5 和 3 都不可能成为最大值,因为 6 比它们更大,而且比它们更晚过期。因此可以直接将它们从队尾删除。

经过处理后,队列对应的元素始终保持单调不增,队首自然就是当前窗口内最大的候选值。

代码中使用的是 nums[candidate_indices[-1]] < nums[current_index],因此遇到相等元素时,会同时保留它们的下标。这种写法没有问题:较早的相同元素过期后,较晚的相同元素仍然可以继续作为最大值。

如果改成 <=,也同样正确。此时会删除较早出现的相同元素,只保留位置更靠右的那个,因为它能够在窗口中停留更久。

2. 为什么队列中必须存下标

如果队列只保存元素值,就无法判断一个元素是否已经随着窗口移动而离开。

当前窗口的左边界为 current_index - k + 1。如果队首下标小于这个左边界,说明它已经不在当前窗口中,需要从队首删除。

例如,窗口大小 k = 3,当前遍历到下标 4,那么当前窗口覆盖的下标范围是 [2, 4]。此时任何小于 2 的下标都已经过期。

因此,存储下标能够同时解决两个问题:

  • 根据下标访问对应元素,维护单调性;
  • 根据下标判断元素是否离开窗口。

3. 为什么队首一定是最大值

队列中的下标按照进入顺序排列,其对应元素值则保持单调不增。因此,队首对应的元素一定不小于队列中的其他元素。

同时,程序会及时删除已经离开窗口的队首下标,所以队首元素始终属于当前窗口。当窗口长度达到 k 后,直接读取 nums[candidate_indices[0]],就是当前窗口最大值。

复杂度分析

虽然代码中存在一个 while 循环,但时间复杂度并不是 O(n²)。

每个数组下标最多执行两次队列操作:

  • 进入队列一次;
  • 从队首或队尾离开队列一次。

某个下标一旦被删除,就不会再次进入队列。因此,所有 while 循环在整个程序中的执行次数累计不会超过 n,总时间复杂度为 O(n)。

队列中最多保存当前窗口中的 k 个下标,所以空间复杂度为 O(k)。

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  1. CONNECT:[ UseTime:0.001007s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001965s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000854s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000905s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.004825s ]
  6. SELECT * FROM `set` [ RunTime:0.000743s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.002131s ]
  8. SELECT * FROM `article` WHERE `id` = 871391 LIMIT 1 [ RunTime:0.001417s ]
  9. UPDATE `article` SET `lasttime` = 1784735792 WHERE `id` = 871391 [ RunTime:0.049711s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.001065s ]
  11. SELECT * FROM `article` WHERE `id` < 871391 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001667s ]
  12. SELECT * FROM `article` WHERE `id` > 871391 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.006829s ]
  13. SELECT * FROM `article` WHERE `id` < 871391 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002376s ]
  14. SELECT * FROM `article` WHERE `id` < 871391 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002302s ]
  15. SELECT * FROM `article` WHERE `id` < 871391 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.030701s ]
0.339582s