【leetcode❤python】 28. Implement strStr()

#-*- coding: UTF-8 -*-
#题意：大海捞刀，在长字符串中找出短字符串
#AC源码：滑动窗口双指针的方法
class Solution(object):
    def strStr(self, hayStack, needle):
        """
        :type haystack: str
        :type needle: str
        :rtype: int
        """
        if len(needle)>len(hayStack):return -1
        lenN=len(needle)
        needleDic=[];hayStackDic=[]
        for i  in xrange(len(needle)):
            needleDic.append(needle[i])
        for i in xrange(0,len(needle)):
              hayStackDic.append(hayStack[i])
        i=0      
        while 1:
            if needleDic==hayStackDic:
                return i
            del hayStackDic[0]
            if i+lenN>len(hayStack):break
            hayStackDic.append(hayStack[i+lenN])
            i+=1
        return -1

sol=Solution()
print sol.strStr("pi","pi")