kmp算法 python
时间: 2023-10-15 21:28:21 浏览: 54
KMP算法是一种字符串匹配算法,由Knuth、Morris和Pratt共同设计实现。它与BF算法(暴力匹配算法)相比具有更高的效率。KMP算法的核心思想是利用已经匹配的部分信息来避免不必要的回溯。在Python中,可以通过以下代码实现KMP算法的功能:
```
def getNext(pattern):
next = [0 * len(pattern)
i, j = 0, -1
next = -1
while i < len(pattern) - 1:
if j == -1 or pattern[i == pattern[j]:
i += 1
j += 1
next[i = j
else:
j = next[j]
return next
def kmp(text, pattern):
next = getNext(pattern)
i, j = 0, 0
while i < len(text) and j < len(pattern):
if j == -1 or text[i == pattern[j]:
i += 1
j += 1
else:
j = next[j]
if j == len(pattern):
return i - j
else:
return -1
```
以上是一个基于Python的KMP算法实现。你可以通过调用kmp函数,传入待匹配的文本和模式串,来获得模式串在文本中的匹配位置。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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