Leetcode 28: Implement strStr()

题目：

python3代码：

class Solution:
    def strStr(self, haystack: str, needle: str) -> int:
        if (len(haystack) == 0 and len(needle) == 0) or (len(haystack) != 0 and len(needle) == 0):
            return 0
        if len(haystack) < len(needle):
            return -1
        for i in range(len(haystack)-len(needle)+1):
            if haystack[i:i+len(needle)] == needle:
                return i
        return -1

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