leetCode练题——28. Implement strStr()

1、题目

28. Implement strStr()——Easy

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().

2、我的解答

用python3自带的方法 find 就可以了。。。。

 # -*- coding: utf-8 -*-
 # @Time    : 2020/2/4 11:03
 # @Author  : SmartCat0929
 # @Email   : 1027699719@qq.com
 # @Link    : https://github.com/SmartCat0929
 # @Site    :
 # @File    : 28. Implement strStr().py

 class Solution:
     def strStr(self, haystack: str, needle: str) -> int:
             a=haystack.find(needle)
             return a
 print(Solution().strStr("happynewyear",""))