Leetcode-Implement strStr()-Python
2017-08-17 19:39
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Implement strStr()
从字符串中找出给定子字符串的索引,若不存在则返回-1。Description
解题思路:
用python解决这道题很简单,因为python字符串自带的find的方法可以直接实现。
def strStr(self, haystack, needle): """ :type haystack: str :type needle: str :rtype: int """ return haystack.find(needle)
不采用find()方法的解题思路:
采用brute force方式,即依次从字符串的每个位置开始,截取和子字符串相同长度的字符串,与给定的子字符串进行比较。
def strStr(self, haystack, needle): """ :type haystack: str :type needle: str :rtype: int """ for i in range(len(haystack)-len(needle)+1): if haystack[i:i+len(needle)] == needle: return i return -1
改进:http://blog.csdn.net/linhuanmars/article/details/20276833
提出了一种rolling hash的方式。
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