Implement atoi to convert a string to an integer.

Hint:Carefully consider all possible input cases. If you want a challenge, please do not see below and ask yourself what are the possible input cases.

Notes:It is intended for this problem to be specified vaguely (ie, no given input specs). You are responsible to gather all the input requirements up front.

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题意：

就是自己实现atoi，这题最坑的是越界的时候应该返回最大或最小值max_int 与min_int，但题目中没有提示——当然这样设计的一个目的可能是防止刷题人直接调用itoa函数。注意 后面有字符时，直接跳出输出前面的数，与atoi一致。

我的做法是定义long long型，超限时break。