59 lines
1.3 KiB
Python
59 lines
1.3 KiB
Python
#coding: utf-8
|
|
''' mbinary
|
|
#########################################################################
|
|
# File : KMP.py
|
|
# Author: mbinary
|
|
# Mail: zhuheqin1@gmail.com
|
|
# Blog: https://mbinary.xyz
|
|
# Github: https://github.com/mbinary
|
|
# Created Time: 2018-12-11 14:02
|
|
# Description:
|
|
#########################################################################
|
|
'''
|
|
|
|
def getPrefixFunc(s):
|
|
'''return the list of prefix function of s'''
|
|
length = 0
|
|
i = 1
|
|
n = len(s)
|
|
ret = [0]
|
|
while i<n:
|
|
if s[i]==s[length]:
|
|
length +=1
|
|
ret.append(length)
|
|
i+=1
|
|
else:
|
|
if length==0:
|
|
ret.append(0)
|
|
i+=1
|
|
else:
|
|
length = ret[length-1]
|
|
return ret
|
|
|
|
def findAll(s,p):
|
|
pre = getPrefixFunc(p)
|
|
i = j =0
|
|
n,m = len(s),len(p)
|
|
ret = []
|
|
while i<n:
|
|
if s[i]==p[j]:
|
|
i+=1
|
|
j+=1
|
|
if j==m:
|
|
ret.append(i-j)
|
|
j=pre[j-1]
|
|
else:
|
|
if j==0: i+=1
|
|
else: j = pre[j-1]
|
|
return ret
|
|
def randStr(n=3):
|
|
return [randint(ord('a'),ord('z')) for i in range(n)]
|
|
|
|
if __name__ =='__main__':
|
|
from random import randint
|
|
s = randStr(50)
|
|
p = randStr(1)
|
|
print(s)
|
|
print(p)
|
|
print(findAll(s,p))
|