输入：

-2147483648 -2147483648
1 1

输出：

int

寄了的题解：

https://www.luogu.com.cn/blog/chendre/solution-p1401

https://www.luogu.com.cn/blog/664908/solution-p1401

https://www.luogu.com.cn/blog/FurippuWRY/solution-p1401