@[preying](/user/158475)
你的合并两集合写错了，改完就过了
```cpp
int u = find(mp[i].from),v = find(mp[i].to);
if(u!=v) {
// v[mp[i].from]=1;
// v[mp[i].to]=1;
// cout<<"sajh"<<mp[i].from<<" "<<mp[i].to<<endl;
fa[v]=u;
sum+=mp[i].l;
t++;
}
```
by yizhiming @ 2022-10-30 21:44:41
缩进挂了一行，凑合看吧
by yizhiming @ 2022-10-30 21:45:07
@[yizhiming](/user/369399) 感谢大佬orzorz
by preying @ 2022-11-02 16:10:35