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Discussion of Problem 1205. By the Underground or by Foot?

Who can help me!why wrong???
Posted by t c 20 Apr 2002 22:53

#include<fstream.h>
#include<stdio.h>
#include<math.h>
struct data
{
  int  adjvex;
  double lowcost;
  int in_g;
}closedge[210];
int n;
double distance[210][210];
double g_speed,r_speed;
double sx_dt[210],sy_dt[210],ax_d,ay_d,bx_d,by_d;
///////////////////////////
void read()
{
    int i,j;
    double tempx,tempy;
    cin>>r_speed>>g_speed;
    cin>>n;
  for(i=1;i<=n;i++)
      cin>>sx_dt[i]>>sy_dt[i];
  for(i=0;i<=n+1;i++)
      for(j=0;j<=n+1;j++)
         distance[i][j]=-1;

  cin>>i>>j;
  while(i!=0||j!=0)
  {
     tempx=sx_dt[i]-sx_dt[j];
     tempy=sy_dt[i]-sy_dt[j];
     distance[j][i]=distance[i][j]=sqrt
(tempx*tempx+tempy*tempy)/g_speed;
     cin>>i>>j;
  }
  cin>>ax_d>>ay_d>>bx_d>>by_d;
  for(i=1;i<=n;i++)
  {
     tempx=sx_dt[i]-ax_d;
     tempy=sy_dt[i]-ay_d;
     distance[i][0]=distance[0][i]=sqrt
(tempx*tempx+tempy*tempy)/r_speed;
     tempx=sx_dt[i]-bx_d;
     tempy=sy_dt[i]-by_d;
     distance[i][n+1]=distance[n+1][i]=sqrt
(tempx*tempx+tempy*tempy)/r_speed;
  }
  tempx=ax_d-bx_d;tempy=ay_d-by_d;
  distance[n+1][0]=distance[0][n+1]=sqrt
(tempx*tempx+tempy*tempy)/r_speed;
}
//////////////////
int find_min()
{
    int i,mini=1;
    double min=-1;
    for(i=1;i<=n+1;i++)
    {
        if(closedge[i].in_g==0)
            if(min==-1||min>closedge[i].lowcost)
            {
              mini=i;
              min=closedge[i].lowcost;
            }
    }
    return mini;
}
////////////////////////////
void main()
{
  int i,j,k;
  int route[210],rou_num=0;
  double tempx,tempy;
  //freopen("in.txt","r",stdin);
  read();//return;
   k=0;closedge[0].adjvex=0;closedge[0].in_g=1;closedge[0].lowcost=0;

  for(i=1;i<=n+1;i++){closedge[i].adjvex=0;closedge
[i].lowcost=distance[0][i];closedge[i].in_g=0;}

 for(i=1;i<=n+1;i++)
 {
     k=find_min();
     //cout<<k<<" ";//return ;
     if(k==(n+1))break;
     closedge[k].in_g=1;
     for(j=1;j<=n+1;j++)
         if(closedge[j].in_g==0)
         if(distance[k][j]>=0&&distance[k][j]+closedge
[k].lowcost<closedge[j].lowcost)
         {
             closedge[j].adjvex=k;closedge
[j].lowcost=distance[k][j]+closedge[k].lowcost;
         }
 }
 cout.precision(8);
 cout<<closedge[n+1].lowcost<<endl;
 k=n+1;
 //cout<<closedge[n+1].adjvex;return ;
 while(k!=0)
 {
    rou_num++;
    k=route[rou_num]=closedge[k].adjvex;
 }
 cout<<(rou_num-1);//return ;
 for(i=rou_num-1;i>=1;i--)
 cout<<" "<<route[i];
}