@[yhliuhao](/user/850632) 并查集合并写错了
```cpp
fa[m[i].v]=fa[m[i].u];
```
改成
```cpp
fa[find(m[i].v)] = find(m[i].u);
```
by Iniaugoty @ 2023-08-22 10:46:05
@[gty314159](/user/768612)
已解决，感谢
by yhliuhao @ 2023-08-22 10:48:42