zoj 1586

//zoj 1586
#include<iostream>
#include<cstdio>
using namespace std;
#define N 1005
int a[N][N],low[N],n,ans;
int b[N];

int min(int x,int y)
{ return x<y?x:y; }

void prim(int u0)
{
int i,j,m,k;
ans=0;
for (i=1;i<n;i++) low[i]=a[u0][i];
low[u0]=-1;
for (i=1;i<n;i++)
{
m=1<<20;
for (j=0;j<n;j++)
if (low[j]!=-1&&low[j]<m)
{ m=low[j]; k=j; }
ans+=m;
low[k]=-1;
for (j=0;j<n;j++)
if (low[j]!=-1)low[j]=min(low[j],a[k][j]);
}
}

int main()
{
int i,j,t;
scanf("%d",&t);
while(t--)
{
scanf("%d",&n);
for(i=0;i<n;i++) scanf("%d",&b[i]);

for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
scanf("%d",&a[i][j]);
a[i][j]+=b[i]+b[j];
}
}
prim(0);
cout<<ans<<endl;
}
return 0;
}

***************************************************************************************************

#include<iostream>
#include<cstdio>
using namespace std;
#define N 1005
int a[N][N],low[N],n,ans;
int b[N];

int min(int x,int y)
{ return x<y?x:y; }

void prim(int u0)
{
int i,j,m,k;
ans=0;
for (i=1;i<n;i++) low[i]=a[u0][i];
low[u0]=-1;
for (i=1;i<n;i++)
{
m=1<<20;
for (j=0;j<n;j++)
if (low[j]!=-1&&low[j]<m)
{ m=low[j]; k=j; }
ans+=m;
low[k]=-1;
for (j=0;j<n;j++)
if (low[j]!=-1)low[j]=min(low[j],a[k][j]);
}
}

int main()
{
int i,j,t;
scanf("%d",&t);
while(t--)
{
scanf("%d",&n);
for(i=0;i<n;i++) scanf("%d",&b[i]);

for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
scanf("%d",&a[i][j]);
if(i=j) a[i][j]=1<<20; //对角线
else a[i][j]+=b[i]+b[j];
}
}
prim(0);
cout<<ans<<endl;
}
return 0;
}

**************************************************************************888

#include<iostream>
#include<cstdio>
using namespace std;
#define N 1005
#define INF 1000000
int a[N][N],low[N],n,ans;
int b[N];

int min(int x,int y)
{ return x<y?x:y; }

void prim(int u0)
{
int i,j,m,k;
ans=0;
for (i=1;i<n;i++) low[i]=a[u0][i];
low[u0]=-1;
for (i=1;i<n;i++)
{
m=1<<20;
for (j=0;j<n;j++)
if (low[j]!=-1&&low[j]<m)
{ m=low[j]; k=j; }
ans+=m;
low[k]=-1;
for (j=0;j<n;j++)
if (low[j]!=-1)low[j]=min(low[j],a[k][j]);
}
}

int main()
{
int i,j,t;
scanf("%d",&t);
while(t--)
{
scanf("%d",&n);
for(i=0;i<n;i++) scanf("%d",&b[i]);

for(i=0;i<n;i++)
{
for(j=0;j<n;j++)
{
scanf("%d",&a[i][j]);
if(i=j) a[i][j]=INF; //对角线
else a[i][j]+=b[i]+b[j];
}
}
prim(0);
cout<<ans<<endl;
}
return 0;
}