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 虽然偶尔会迷路,但是因为有了你的帮助 **和**从此还是过上了幸福的生活。 ――全剧终――
原题链接:http://acm.hdu.edu.cn/showproblem.php?pid=2112
此题我的Dijkstra算法代码老是RE,找不到错误。。。
#include <iostream>
#include <cstdio>
#include <map>
#include <queue>
using namespace std;
const int INF=0x3f3f3f3f;
int a[155][155];
int dis[155];
bool vis[155];
int n,m;
void spfa()
{
for(int i=1; i<=n; i++)
{
dis[i]=INF;
vis[i]=false;
}
dis[1]=0;
vis[1]=true;
queue<int>q;
q.push(1);
while(!q.empty())
{
int p=q.front();
q.pop();
vis[p]=false;
for(int i=1; i<=n; i++)
{
if(dis[i]>dis[p]+a[p][i])
{
dis[i]=dis[p]+a[p][i];
if(!vis[i])
{
vis[i]=true;
q.push(i);
}
}
}
}
}
int main()
{
char s[35],e[35];
char ss[35],ee[35];
int d;
map<string,int>mapp;
while(scanf("%d",&m)!=EOF,m!=-1)
{
for(int i=0; i<155; i++)
{
for(int j=0; j<155; j++)
if(i==j) a[i][j]=0;
else a[i][j]=INF;
}
mapp.clear();
cin>>ss>>ee;
n=0;
mapp[ss]=++n;
if(mapp[ee]==0)
mapp[ee]=++n;
while(m--)
{
scanf("%s%s%d",&s,&e,&d);
if(mapp[s]==0) mapp[s]=++n;
if(mapp[e]==0) mapp[e]=++n;
if(a[mapp[s]][mapp[e]]>d)
a[mapp[s]][mapp[e]]=a[mapp[e]][mapp[s]]=d;
}
spfa();
if(dis[mapp[ee]]>=INF)
cout<<"-1"<<endl;
else
cout<<dis[mapp[ee]]<<endl;
}
return 0;
}
HDU 2112 HDU Today【最短路+map容器,spfa算法+Dijkstra算法】
原文:http://blog.csdn.net/hurmishine/article/details/52059242