28. 实现 strStr().ipynb

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    "class Solution:\n",
    "    def strStr(self, haystack: str, needle: str) -> int:\n",
    "        if len(needle) <= 0 or len(haystack) <= 0:\n",
    "            return -1\n",
    "        for i in range(len(haystack)):\n",
    "            if needle[0] == haystack[i] and haystack[i:i+len(needle)] == needle:\n",
    "                return i\n",
    "        return -1\n",
    "s = Solution()\n",
    "s.strStr('hello','')"
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