给你改了下，过了
```cpp
#include <bits/stdc++.h>
using namespace std;
int n,m,cnt=0,sum=0,tot=1;
struct edge
{
int from,to,val;
bool operator <(const edge Com)const
{
return val<Com.val;
}
void getin(int I,int J)
{
int x;
scanf("%d" , &x);
if(x)
{
from=I;
to=J;
val=x;
}
}
};
edge ve[500*500+5];
int fa[501];
int fdx(int x)
{
if(fa[x]==x) return x;
return fa[x]=fdx(fa[x]);
}
void unxy(int x,int y)
{
fa[fdx(x)]=fdx(y);
}
void work()
{
for(int i=1;i<=cnt&&tot<=m;i++)
{
if(fdx(ve[i].from)!=fdx(ve[i].to))
{
++tot;
sum+=ve[i].val;
unxy(ve[i].from,ve[i].to);
}
}
}
int main()
{
cin>>n>>m;
for(int i=1;i<=m;i++)
{
for(int j=1;j<=m;j++)
{
ve[++cnt].getin(i,j);
}
}
for(int i=1;i<=m;i++)
{
ve[i].from=0;
ve[i].to=i;
ve[i].val=n;
}
for(int i=1;i<=m;i++)
{
fa[i]=i;
}
sort(ve+1,ve+cnt+1);
work();
printf("%d",sum);
return 0;
}
```
by Vegetableless @ 2023-08-22 15:45:59
@[caojiaming](/user/775551)
by Vegetableless @ 2023-08-22 15:50:10