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",""))