1.define只能替换mod(a),不能替换mod(3),mod(4)等。
2.include<>c++会忽略掉这一行‘>’以后的部分
3.膜拜红名大佬
by FantasyB @ 2022-01-17 12:36:17
@[_sto_pengzijun_orz_](/user/556362)
by FantasyB @ 2022-01-17 12:36:38
@[_sto_pengzijun_orz_](/user/556362)
当你试图调用-5-9时:
$mod(5+9)--->(-5-9%10+10)%10$
因此,请在define中善用括号
```
#define mod(a) ((a)%10+10)%10
```
by Gumbo @ 2022-08-01 10:51:55