[LeetCode] strStr

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Implement strStr().

Returns the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.

Update (2014-11-02):
The signature of the function had been updated to return the index instead of the pointer. If you still see your function signature returns a char * or String, please click the reload button  to reset your code definition.

 1 class Solution {
 2 public:
 3     int strStr(string haystack, string needle) {
 4         string::size_type pos = 0;
 5         if (( pos = haystack.find(needle)) != string::npos)
 6             return pos;
 7         else
 8             return -1;
 9     }
10 };

[LeetCode] strStr

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原文地址：http://www.cnblogs.com/vincently/p/4432683.html