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## Re:只能c++过 我也是醉了

Posted by chaiyinlei at 2017-03-23 02:14:50 on Problem 2031
In Reply To:只能c++过 我也是醉了 Posted by:chaiyinlei at 2017-03-23 02:14:36
```#include<stdio.h>
#include<math.h>
#include<string.h>
#include<stdlib.h>
#define inf 0x3f3f3f
double dis[105],lu[105][105],qiu[105][4];;
int vis[105],n;
void prim()
{
for(int i=1;i<=n;i++)
{
dis[i]=lu[1][i];
vis[i]=0;
}
dis[1]=0;vis[1]=1;
for(int i=2;i<=n;i++)
{
double min=inf;
int p;
for(int j=1;j<=n;j++)
{
if(!vis[j]&&dis[j]<min)
{
min=dis[j];
p=j;
}
}
vis[p]=1;
for(int j=1;j<=n;j++)
{
if(!vis[j]&&dis[j]>lu[p][j])
dis[j]=lu[p][j];
}
}
double sum=0;
for(int i=1;i<=n;i++)
{
sum+=dis[i];
}
printf("%.3lf\n",sum);
}
void qiuti()
{
double x,y,z,l,r;
for(int i=1;i<=n;i++)
{
for(int j=i+1;j<=n;j++)
{
x=qiu[i][0]-qiu[j][0];
y=qiu[i][1]-qiu[j][1];
z=qiu[i][2]-qiu[j][2];
l=sqrt(x*x+y*y+z*z);
r=qiu[i][3]+qiu[j][3];
if(l<=r)                  //小于等于
lu[j][i]=lu[i][j]=0;
else
lu[j][i]=lu[i][j]=l-r;
}
}
}
int main()
{
while(scanf("%d",&n),n)
{
memset(qiu,0,sizeof(qiu));
int i,j;
for(i=1;i<=n;i++)
for(j=i;j<=n;j++)
lu[i][j]=lu[j][i]=inf;
for(i=1;i<=n;i++)
{
scanf("%lf %lf %lf %lf",&qiu[i][0],&qiu[i][1],&qiu[i][2],&qiu[i][3]);
}
qiuti();
prim();
}
}```

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