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力扣算法笔试题复习:【滑动窗口】找到字符串中所有字母异位词

力扣算法笔试题复习:【滑动窗口】找到字符串中所有字母异位词
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。

438. 找到字符串中所有字母异位词

原题地址:

https://leetcode.cn/problems/find-all-anagrams-in-a-string/description/

题目给定两个字符串 s 和 p,要求在 s 中找到所有是 p 的字母异位词的子串,并返回这些子串的起始索引。

所谓字母异位词,就是两个字符串使用的字符种类和每种字符出现次数完全相同,只是排列顺序可以不同。比如 "abc""bac""cba" 都互为字母异位词;但 "abb" 和 "abc" 就不是,因为字符出现次数不同。

举个例子:

输入:

s = "cbaebabacd"p = "abc"

输出:

[06]

原因是:

  • 下标 0 开始的子串 "cba" 是 "abc" 的异位词;
  • 下标 6 开始的子串 "bac" 也是 "abc" 的异位词。

再看一个:

s = "abab"p = "ab"

输出:

[012]

因为 "ab""ba""ab" 都是 "ab" 的异位词。

这道题的核心其实很明确:在 s 中不断截取长度为 len(p) 的子串,判断这个子串是否和 p 具有相同的字符组成。如果相同,就记录当前起始下标。

第一种:固定长度窗口 + 排序比较

最直接的想法是:因为要找的是 p 的异位词,所以目标子串的长度一定和 p 相同。于是可以在 s 上维护一个长度固定为 len(p) 的窗口,每次截取一个子串,将这个子串排序后与排序后的 p 比较。

如果两个排序结果相同,说明它们字符组成一致,也就是字母异位词。

classSolution:deffindAnagrams(self, s: str, p: str) -> list[int]:        result = []        window_size = len(p)        sorted_p = sorted(p)        start = 0while start + window_size <= len(s):            window = s[start:start + window_size]if sorted(window) == sorted_p:                result.append(start)            start += 1return result

这段代码的逻辑非常直接:

  • window_size = len(p):固定窗口长度;
  • sorted_p = sorted(p):提前对 p 排序,避免每次重复排序;
  • 每次从 s 中截取长度为 window_size 的子串;
  • 对当前子串排序后与 sorted_p 比较;
  • 如果相等,说明当前窗口是一个合法异位词,记录起始下标。

以 s = "cbaebabacd"p = "abc" 为例:

  • s[0:3] = "cba",排序后是 ['a', 'b', 'c'],命中,记录 0
  • s[1:4] = "bae",排序后不是 ['a', 'b', 'c'],跳过;
  • ...
  • s[6:9] = "bac",排序后是 ['a', 'b', 'c'],命中,记录 6

这种写法非常容易理解,本质上就是枚举每一个长度为 len(p) 的候选子串,然后判断它是不是异位词。

不过它的问题也比较明显:每移动一次窗口,都需要对子串重新排序。如果 p 的长度是 m,排序一次的复杂度是 O(m log m);而窗口最多会移动 n - m + 1 次,所以整体时间复杂度是:

O((n - m + 1) * m log m)

近似记为 O(n * m log m)

空间复杂度主要来自排序产生的临时数组,为 O(m)

这种方法适合作为入门理解,但如果数据规模较大,重复排序会带来不必要的开销。

第二种:滑动窗口 + 字符频次统计

判断两个字符串是否为异位词,本质上不需要排序。只要它们的字符频次完全一致,就一定是异位词。

因此可以用哈希表或数组统计字符出现次数。由于本题通常只涉及英文小写字母,所以可以用长度为 26 的数组表示字符频次:

  • target_count 记录 p 中每个字符出现的次数;
  • window_count 记录当前窗口中每个字符出现的次数;
  • 当两个数组相等时,说明当前窗口是 p 的异位词。
classSolution:deffindAnagrams(self, s: str, p: str) -> list[int]:        result = []        s_len, p_len = len(s), len(p)if s_len < p_len:return result        target_count = [0] * 26        window_count = [0] * 26for char in p:            target_count[ord(char) - ord('a')] += 1for right in range(s_len):# 右侧字符进入窗口            right_char_index = ord(s[right]) - ord('a')            window_count[right_char_index] += 1# 当窗口长度超过 p_len 时,左侧字符移出窗口if right >= p_len:                left_char_index = ord(s[right - p_len]) - ord('a')                window_count[left_char_index] -= 1# 窗口长度达到 p_len 后,开始判断是否匹配if right >= p_len - 1:if window_count == target_count:                    start = right - p_len + 1                    result.append(start)return result

这版写法的核心是维护一个固定长度的滑动窗口。

右指针 right 不断向右移动,每次把 s[right] 加入窗口。当窗口长度超过 p_len 时,就把最左侧那个字符移出窗口。这样可以保证窗口始终最多只有 p_len 个字符。

当 right >= p_len - 1 时,说明窗口长度已经达到 p_len,此时就可以判断当前窗口的字符频次是否等于 p 的字符频次。如果相等,当前窗口就是一个异位词,起始位置为:

right - p_len + 1

比如 s = "cbaebabacd"p = "abc"

  • 当窗口为 "cba" 时,字符频次和 "abc" 一致,记录下标 0
  • 窗口继续右移;
  • 当窗口变成 "bac" 时,字符频次再次一致,记录下标 6

这种方法避免了每次对子串排序,窗口每移动一步只做两件事:

  1. 加入一个新字符;
  2. 移除一个旧字符。

由于字符集大小固定为 26,比较两个长度为 26 的数组可以视为常数时间。因此整体时间复杂度是 O(n),空间复杂度是 O(1)

总结

这道题本质上是在字符串 s 中寻找所有长度固定为 len(p) 的窗口,并判断窗口内字符频次是否与 p 一致。

排序比较的写法最直观,但每个窗口都要重新排序,时间开销较大;滑动窗口配合字符频次数组,可以在窗口右移时增量维护状态,把整体复杂度优化到 O(n)。一句话总结:异位词判断看字符频次,固定长度子串问题优先考虑滑动窗口。

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  1. CONNECT:[ UseTime:0.000539s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000786s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000279s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000309s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000445s ]
  6. SELECT * FROM `set` [ RunTime:0.000205s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000595s ]
  8. SELECT * FROM `article` WHERE `id` = 822735 LIMIT 1 [ RunTime:0.000462s ]
  9. UPDATE `article` SET `lasttime` = 1786200283 WHERE `id` = 822735 [ RunTime:0.000645s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000191s ]
  11. SELECT * FROM `article` WHERE `id` < 822735 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000396s ]
  12. SELECT * FROM `article` WHERE `id` > 822735 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000304s ]
  13. SELECT * FROM `article` WHERE `id` < 822735 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000676s ]
  14. SELECT * FROM `article` WHERE `id` < 822735 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001072s ]
  15. SELECT * FROM `article` WHERE `id` < 822735 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000856s ]
0.085346s