116 lines
2.4 KiB
C++
116 lines
2.4 KiB
C++
#include <iostream>
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#include <cstdio>
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#include <map>
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#include <vector>
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#include <cstring>
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#include <algorithm>
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using namespace std;
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const int maxn=10005;
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const int INF=0x3fffffff;
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int que[maxn];
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int st[110];
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int g[110][110];
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int inque[maxn];
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int dis[maxn];
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int n, num;
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struct Node
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{
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int v, cost;
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Node(int v_,int cost_)
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{
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v=v_, cost=cost_;
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}
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};
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map<int,int>mp;
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vector<Node>vt[maxn];
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void spfa(int start)
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{
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int h=0, t=0;
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for(int i=1; i<=n; i++)
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{
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dis[i]=INF;
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inque[i]=0;
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}
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dis[start]=0;
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inque[start]=1;
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que[t++]=start;
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while(h!=t)
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{
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int u=que[h++];
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inque[u]=0;
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if(h==maxn) h=0;
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for(int i=0; i<vt[u].size(); i++)
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{
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int v=vt[u][i].v, cost=vt[u][i].cost;
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if(dis[v]>dis[u]+cost)
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{
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dis[v]=dis[u]+cost;
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if(!inque[v])
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{
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inque[v]=1;
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que[t++]=v;
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if(t==maxn) t=0;
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}
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}
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}
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}
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for(int i=1; i<=n; i++)
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{
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if(dis[i]<=600)
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{
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g[mp[start]][mp[i]]=1;
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}
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}
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}
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void floyd()
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{
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for(int k=0; k<=num+1; k++)
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for(int i=0; i<=num+1; i++)
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for(int j=0; j<=num+1; j++)
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{
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if(g[i][j]>g[i][k]+g[k][j])
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g[i][j]=g[i][k]+g[k][j];
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}
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}
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int main()
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{
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int h, m, u, v, cost;
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while(cin >> n, n)
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{
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cin >> num;
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mp.clear();
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for(int i=0; i<=n; i++)
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vt[i].clear();
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for(int i=0; i<=num+2; i++)
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for(int j=0; j<=num+2; j++)
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{
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g[i][j]=INF;
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if(i==j) g[i][j]=0;
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}
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for(int i=1; i<=num; i++)
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{
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scanf("%d",st+i);
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mp[st[i]]=i;
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}
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st[0]=1;
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mp[1]=0;
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st[num+1]=n;
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mp[n]=num+1;
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cin >> m;
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for(int i=0; i<m; i++)
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{
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scanf("%d%d%d",&u,&v,&cost);
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vt[u].push_back(Node(v,cost));
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vt[v].push_back(Node(u,cost));
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}
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for(int i=0; i<=num; i++)
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spfa(st[i]);
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floyd();
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if(g[0][num+1]==INF)
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cout << -1 <<endl;
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else
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cout << g[0][num+1]-1 <<endl;
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}
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return 0;
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}
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