要不您把头文件换bits/stdc++.h试试？
by moye到碗里来 @ 2018-02-09 17:00:09
您的edge数组开大了：
N<<1+5改为(N<<5)+1（这样同样可能会炸，因为数组过大）
```
noilinux@ubuntu:~/Desktop$ g++ x.cpp -g -Wall -Wextra
x.cpp:12:8: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses]
}edge[N<<1+5];
^
x.cpp:16:12: warning: suggest parentheses around ‘+’ inside ‘<<’ [-Wparentheses]
}question[N<<1+5];
^
x.cpp: In function ‘void addquestion(int, int)’:
x.cpp:29:43: warning: missing initializer for member ‘Question::LCA’ [-Wmissing-field-initializers]
question[++cntQ]=(Question){headq[u],v},headq[u]=cntQ;
^
x.cpp:30:43: warning: missing initializer for member ‘Question::LCA’ [-Wmissing-field-initializers]
question[++cntQ]=(Question){headq[v],u},headq[v]=cntQ;
^
```
by Creeper_LKF @ 2018-02-09 17:04:37
@[ezoiHY](/space/show?uid=48146)
by Creeper_LKF @ 2018-02-09 17:05:05
@[Creeper_LKF](/space/show?uid=43464) 难道不是（N<<1）+5 吗
by qwqKanade @ 2018-02-09 17:09:51
orz @[ezoiHY](/space/show?uid=48146)
by ezoixx130 @ 2018-02-09 17:12:52
@[ezoiHY](/space/show?uid=48146) 你位运算要加括号
例如（N<<1）+5
因为位运算符优先级小于+-×/
by star_magic_young @ 2018-02-09 17:22:12
谢谢
by ezoiHY @ 2018-02-10 08:53:10
@[ezoixx130](/space/show?uid=34886) 膜拜啊
by ezoiHY @ 2018-02-10 08:53:48