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.
思路：没用KMP，直接字符串比较，O（m*n）
class Solution { public: int strStr(char *haystack, char *needle) { int hayLen = strlen(haystack); int needLen= strlen(needle); for(int i = 0; i <= hayLen-needLen; i++) { int k = i; int j = 0; for(/* */; j <needLen; /* */) { if(haystack[k] == needle[j]) { k++; j++; } else break; } if(j == needLen) return i; } return -1; } };
原文：http://www.cnblogs.com/diegodu/p/4280086.html