HDU today（最短路徑）

HDU TodayCrawling in process... Crawling failed Time Limit:5000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u

6
xiasha westlake
xiasha station 60
xiasha ShoppingCenterofHangZhou 30
station westlake 20
ShoppingCenterofHangZhou supermarket 10
xiasha supermarket 50
supermarket westlake 10
-1

50


Hint:
The best route is:
xiasha->ShoppingCenterofHangZhou->supermarket->westlake


雖然偶爾會迷路，但是因?yàn)橛辛四愕膸椭?**和**從此還是過上了幸福的生活。

��全劇終��

# include <stdio.h>
# include <stdlib.h>
# include <string.h>
int map[160][160];
int pra[160];
int visit[160];
int dis[160];
const int inf=1<<20;
int n,m;
int dijstra(int start)
{
 	 int min,rec;
 	 for(int i=1;i<=m;i++)
 	 {
		 pra[i]=0;
		 dis[i]=inf;
		 visit[i]=0;
	 }
	 dis[start]=0;
	 for(int i=1;i<=m;i++)
	 {
	  	min=inf;
		for(int j=1;j<=m;j++)
		{
		 	if(!visit[j]&&min>dis[j])
		 	{
				 min=dis[j];
				 rec=j;
	        }
		}
		visit[rec]=1;
		if(rec==2)break;
		for(int j=1;j<=m;j++)
		{
		    if(!visit[j]&&dis[j]>map[rec][j]+dis[rec])
			{
				  dis[j]=map[rec][j]+dis[rec];
				  pra[j]=rec;
	        }
		}	 	 
	 }
	 return min;
}		 
int main()
{
 	while(scanf("%d",&n)!=EOF&&n!=-1)
 	{
	    char str1[40],str2[40];
	    char str[160][40];
	    int val,num1,num2;
	    int i,j,t;
		m=3;
	    memset(map,0x7f,sizeof(map));
	    scanf("%s%s",&str[1],&str[2]);
	    for(i=1;i<=n;i++)
	    {
		     scanf("%s%s%d",&str1,&str2,&val);
			 for(j=1;j<=m;j++)
 		 	 {
	  		  	if(strcmp(str1,str[j])==0)
					{
					 	num1=j;
						break;
					}
		     }
			 if(j>m)
			 {
			  	strcpy(str[m++],str1);
				num1=m-1;
		     }
			 for(j=1;j<=m;j++)
			 {
 	  		    if(strcmp(str2,str[j])==0)
 	  		    	{
					 	num2=j;
						break;
				    }
			 }
			 if(j>m)
			 {
			  	strcpy(str[m++],str2);
				num2=m-1;
			 }
			 if(map[num1][num2]>val)
			 	map[num1][num2]=map[num2][num1]=val;		 
	    }
	    t=dijstra(1);
	 	if(strcmp(str[1],str[2])==0)
             printf("0\n");
   		else 
		   {
		   	 if(t==inf)
				printf("-1\n");
			 else 	 
	            printf("%d\n",t);
		   }
	 }   
}