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LC-实现函数 strStr
阅读量:691 次
发布时间:2019-03-17

本文共 663 字,大约阅读时间需要 2 分钟。

实现函数 strStr

/*实现函数 strStr函数声明如下:char *strStr(char *str, char *dest)返回一个指针,指向dest第一次在str中出现的位置,如果dest不是str的子串,则返回null*/#include
#include
#include
using namespace std;class Solution { public: char *strStr(char *str, char *dest) { if (str == NULL && dest == NULL) return NULL; if (str == NULL || dest == NULL) return NULL; size_t result = strStrImpl(str, dest); if (result == -1) return NULL; char* resPtr = str; size_t index = 0; while (index < result) { index++; resPtr++; } return resPtr; } char strStrImpl(string str, string dest) { size_t res = str.find(dest); return (res != str.npos) ? res : -1; }};

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