Dijkstra模板

数据：

6
0 2 5
0 3 30
1 0 2
1 4 8
2 5 7
2 1 15
4 3 4
5 3 10
5 4 18
-1 -1 -1

#include<iostream>
#include<cstring>
#include<cstdio>
#define INF 1000000
#define MAXN 20
int n,Edge[MAXN][MAXN],s[MAXN],dist[MAXN],path[MAXN];
void Dijkstra(int v0)
{
int i,j,k;
for(i=0;i<n;++i)
{
dist[i] = Edge[v0][i];s[i] = 0;
if(i!=v0&&dist[i]<INF)path[i] = v0;
else path[i]=-1;
}
s[v0] = 1; dist[v0] = 0;
for(i=0;i<n-1;++i)
{
int min = INF,u=v0;
for(j=0;j<n;++j)
{
if(!s[j]&&dist[j]<min)
{
u = j;min = dist[j];
}
}
s[u] = 1;
for(k=0;k<n;++k)
{
if(!s[k]&&Edge[u][k]<INF&&dist[u]+Edge[u][k]<dist[k])
{
dist[k] = dist[u] + Edge[u][k];path[k] = u;
}
}
}
}
int main()
{
int i,j;
int u,v,w;
scanf("%d",&n);
while(1)
{
scanf("%d%d%d",&u,&v,&w);
if(u==-1&&v==-1&&w==-1)break;
Edge[u][v] = w;
}
for(i=0;i<n;++i)
{
for(j=0;j<n;++j)
{
if(i==j)Edge[i][j] = 0;
else if(Edge[i][j]==0)Edge[i][j] = INF;
}
}
Dijkstra(0);
int shortest[MAXN];
for(i=1;i<n;++i)
{
printf("%d\t",dist[i]);
memset(shortest,0,sizeof(shortest));
int k=0;
shortest[k] = i;
while(path[shortest[k]]!=0)
{
k++;shortest[k] = path[shortest[k-1]];
}
k++;shortest[k] = 0;
for(j=k;j>0;j--)
printf("%d->",shortest[j]);
printf("%d\n",shortest[0]);
}
return 0;
}