原代码中，我写的是：
```cpp
struct edge
{
int to;
int nex;
int val;
}e[maxn];
```
而后来我改成了：
```cpp
struct edge
{
int to;
int nex;
int val;
}e[maxn<<1];
```
却A了，原因至今是个谜
by first_fan @ 2019-09-18 00:09:59
@[first_fan](/space/show?uid=126484) 无向图边不开两倍的错怎么还有人犯（捂脸）
by StudyingFather @ 2019-09-18 00:26:37
原因可能是空间开小了会引起无限递归导致MLE
by Rhodoks @ 2019-09-18 00:41:56
数组越界在评测机上可能表现为 AC, WA, RE, TLE, MLE（
by fa_555 @ 2019-09-18 06:09:56
没事，反正把锅推给 UB 就对了（
by tiger0133 @ 2019-09-18 07:02:21
你存不下边的时候也会MLE
by zlnleo @ 2019-09-18 09:07:20
MLE其实大部分都是递归爆栈
数组开过大那种错误
应该没什么人会犯吧
by whyl @ 2019-09-18 09:10:50
@[first_fan](/space/show?uid=126484) %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
by BrandonSoong @ 2019-10-05 23:50:38
@[BS一夏雪](/space/show?uid=117111)
你是魔鬼吗
by first_fan @ 2019-10-05 23:57:08
刚好做到2333，话说这道题被标记为树链剖分也太牵强了2333
by BrandonSoong @ 2019-10-06 00:12:32