<!-- lang: cpp -->
#include<iostream>
using namespace std;
struct edge
{
int a,b,cost;
edge *next;
edge(){next=NULL;}
};
edge *h,*p;
int d[101],n,e;
void BellmanFord()
{
int i;
for(i=0;i<n-1;i++)
{
for(p=h;p!=NULL;p=p->next)
if(d[p->b]>d[p->a]+p->cost)
d[p->b]=d[p->a]+p->cost;
}
}
int main()
{
int i,tmpa,tmpb,tmpc;
while(cin>>n>>e&&(n!=0||e!=0))
{
h=p=NULL;
for(i=0;i<n;i++)
d[i]=0xfffffff;
d[0]=0;
for(i=0;i<e;i++)
{
cin>>tmpa>>tmpb>>tmpc;
h=new edge;
h->a=tmpa-1;
h->b=tmpb-1;
h->cost=tmpc;
h->next=p;
p=h;
h=new edge;
h->a=tmpb-1;
h->b=tmpa-1;
h->cost=tmpc;
h->next=p;
p=h;
}
BellmanFord();
cout<<d[n-1]<<endl;
}
return 0;
}
转载于:https://my.oschina.net/fzyz999/blog/143353