@[Jzy0228](/user/245089) 首先并查集写错了，其次数组越界。
by yyandy @ 2022-06-09 12:55:18
```cpp
int getfa(int x)
{
if(x == fa[x]) return fa[x];
fa[x] = getfa(fa[x]);
return fa[x];
}
```
by yyandy @ 2022-06-09 12:55:41