Simple Python solution


  • 0
    Y
    class Solution(object):
        def strStr(self, haystack, needle):
            """
            :type haystack: str
            :type needle: str
            :rtype: int
            """
            if len(needle) == 0:
                return 0
            if len(needle) > len(haystack):
                return -1
            h, n = len(haystack), len(needle)
            for i in range(h-n+1):
                if haystack[i:i+n] == needle:
                    return i
            return -1
    

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