"""Leetcode 28. Implement strStr()
Easy

URL: https://leetcode.com/problems/implement-strstr/

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", needle = "bba"
Output: -1
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().
"""

class Solution(object):
    def strStr(self, haystack, needle):
        """
        :type haystack: str
        :type needle: str
        :rtype: int
        """
        pass


def main():
    pass


if __name__ == '__main__':
    main()

Add lc028_implement_strstr.py