先mark，后续再搞

位运算基础：
https://blog.csdn.net/goskalrie/article/details/52796360

加减乘除

1：https://blog.csdn.net/zuochao_2013/article/details/79183621

2：https://www.jianshu.com/p/7bba031b11e7

https://www.cnblogs.com/ygj0930/p/6412875.html

https://blog.csdn.net/hhy107107/article/details/82801780