28. Implement strStr()

Easy


Implement strStr().

Given two strings needle and haystack, 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

 

Constraints:

  • 1 <= haystack.length, needle.length <= 104
  • haystack and needle consist of only lowercase English characters.




 class Solution:
    def strStr(self, haystack: str, needle: str) -> int:

        return haystack.find(needle)

Random Note


  1. Effectively Using Django REST Framework Serializers
  2. How To Use DRF Serializers Effectively in Django
  3. My personal django rest framework serializer notes
  4. How to use DRF serializers effectively during write operations