#28 Implement strStr() | Top Interview Questions | Ultimate Leetcode Challenge
Implement strStr()
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Problem Statement - 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().
Example 1:
Input: haystack = "hello", needle = "ll"
Output: 2
Example 2:
Input: haystack = "aaaaa", needle = "bba"
Output: -1
Example 3:
Input: haystack = "", needle = ""
Output: 0
Constraints:
haystack.length, needle.length = [0, 5 * 10^4]
haystack and needle consist of only lower-case English characters.
Link to the problem --- https://leetcode.com/problems/impleme...
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