另问，为什么用乘法得出的结果错误
by IT__windy @ 2022-08-17 11:26:45
因为double有精度误差
by 御坂10029号 @ 2022-08-17 11:29:29
@[IT__windy](/user/597716) 我当时也是这样，没有考虑到可能爆 long long 。
by _cyle_King @ 2022-08-17 11:30:32
>(x(i)-x(l))*(y(l)-y(l-1))>=(y(i)-y(l))*(x(l)-x(l-1)))--r;
什么东西，l和r混了吧
by zty1203 @ 2022-08-17 11:31:00
宏定义要加一个括号，像这样
by gujiga @ 2022-08-17 11:31:54
$#define a(i) (c[i]+i)$
by gujiga @ 2022-08-17 11:32:57
@[gujiga](/user/327969) 建议代码不要用 $\LaTeX$，用行内代码块
by 御坂10029号 @ 2022-08-17 11:34:06
`#define a(i) (c[i]+i)`
by 御坂10029号 @ 2022-08-17 11:34:30
```cpp
谢谢
```
by gujiga @ 2022-08-17 11:36:31
@[_cyle_King](/user/582035) 我开long long了...
by IT__windy @ 2022-08-17 12:14:45