```cpp
int find(int x){
if(fa[x]==x){
return x;
}else{
fa[x]=find(x);
return fa[x];
}
}
```
find函数第五行无限递归自己，卡死循环，会爆栈MLE，改成
```cpp
fa[x] = find(f[x]);
```
就可以了
by 2308weibowen @ 2024-05-02 23:15:52
@[2308weibowen](/user/1098596) 感谢，此帖结
by Xieaotong @ 2024-05-16 18:32:12