LeetCode Solution, Easy, 28. Implement strStr()
28. Implement strStr()
題目敘述
Implement strStr().
Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.
Example 1:
Input: haystack = "hello", needle = "ll"
Output: 2
Example 2:
Input: haystack = "aaaaa...
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