版权声明：文章都是原创，转载请注明~~~~ https://blog.csdn.net/SourDumplings/article/details/86529228
Easy
7241117FavoriteShare
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().
C++：
/*
@Date : 2019-01-15 20:46:07
@Author : 酸饺子 ([email protected])
@Link : https://github.com/SourDumplings
@Version : $Id$
*/
/*
https://leetcode.com/problems/implement-strstr/
*/
class Solution
{
public:
int strStr(string haystack, string needle)
{
if (needle.empty())
{
return 0;
}
return haystack.find(needle);
}
};
Java：
扫描二维码关注公众号，回复：
4963922 查看本文章
/**
* @Date : 2019-01-15 20:49:24
* @Author : 酸饺子 ([email protected])
* @Link : https://github.com/SourDumplings
* @Version : $Id$
*
* https://leetcode.com/problems/implement-strstr/
*/
class Solution
{
public int strStr(String haystack, String needle)
{
return haystack.indexOf(needle);
}
}