28. Implement strStr()

[ritik307]

Implement strStr().

Return the index of the first occurrence of needle in a haystack, or -1 if the needle is not part of haystack. Clarification: What should we return when the 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 the 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

[ritik307]

@piyushsharma220699 I want to solve this in C++, Kindly assign this issue to me as a part of hacktoberfest-2021

[piyushsharma220699]

@ritik307 Assigned in C++