@[char_yin](/user/247531) 路径压缩
by hht2005 @ 2020-01-05 07:59:46
@[hht2005](/user/151722) 谢谢大佬，改过来了
by hulne @ 2020-01-05 08:04:48
按秩合并
by 谷民 @ 2020-01-05 08:46:18
改成
```cpp
int find(int o){
if(o == fa[o]) return o;
else return fa[o]=find(fa[o]);
}
```
by Happy_Orca @ 2020-01-05 08:55:51