```cpp
void con(int a,int b)
{
int top;
while(fa[a]!=a) a=fa[a]=fa[fa[a]];
fa[top]=b;
}
```
`top` 没有赋初值
by guodong @ 2021-11-07 21:10:43
@[l55584](/user/184271) 你 con 里 top 未初始化。
顺便说一下，-Wall 与 -Werror 是个好东西。
by Carnival @ 2021-11-07 21:13:01
谢谢谢谢
by l55584 @ 2021-11-07 22:32:37
con里top???未初始化
by ChaseDream @ 2022-05-30 13:06:08