Leetcode 028 Implement strStr()

Implement strStr().

Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.

Clarification:

What should we return when needle is an empty string? This is a great question to ask during an interview.

For the purpose of this problem, we will return 0 when needle is an empty string. This is consistent to C’s strstr() and Java’s indexOf().

Input: haystack = "hello", needle = "ll"
Output: 2

Input: haystack = "aaaaa", needle = "bba"
Output: -1

Input: haystack = "", needle = ""
Output: 0

• Soruda bize iki string veriliyor ve birinci string içerisinde ikinci string hangi indexte başladığı soruluyor.

    def strStr(self, haystack: str, needle: str) -> int:
        if not needle:
            return 0
        
        for i in range(len(haystack)):
            if (haystack[i:i+len(needle)]) == needle:
                return i
        return -1