e 数组要开到 n 的两倍即
```cpp
struct node
{
int to , nxt;
}e[32010];
```
by Hell0_W0rld @ 2023-01-17 09:34:10
@[DongYUyao](/user/719978)
by Hell0_W0rld @ 2023-01-17 09:34:34
@[xionglangqi](/user/555345) thx
by DYYqwq @ 2023-01-17 09:35:34
@[xionglangqi](/user/555345) 可是为什么最后一个点寄掉了捏？
by DYYqwq @ 2023-01-17 09:36:59
ans 初始赋值不能是 $0$，应该是 $-\infty$，否则答案都是负数就寄了 @[DongYUyao](/user/719978)
by Hell0_W0rld @ 2023-01-17 09:39:32
@[xionglangqi](/user/555345) OK
by DYYqwq @ 2023-01-17 09:41:17
@[xionglangqi](/user/555345) [你 谷 日 爆](https://www.luogu.com.cn/record/100044296)
by DYYqwq @ 2023-01-17 09:44:32
@[DongYUyao](/user/719978) 好吧，没爆
by DYYqwq @ 2023-01-17 09:44:56
直接用 max_element 吧
by Hell0_W0rld @ 2023-01-17 09:46:50
@[xionglangqi](/user/555345) 神犇啊，咋用啊QAQ
by DYYqwq @ 2023-01-17 09:49:48