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