65 lines
1.2 KiB
C++
65 lines
1.2 KiB
C++
#include<stdio.h>
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#define max 1001
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#define INF 100000000
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int N;
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int v[max];
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int dis[max];
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int g[max][max];
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void dijk()
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{
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int i,j,mark,mindis;
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for(i=0;i<=N;i++)
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{
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v[i] = 0;
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dis[i] = INF;
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}
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dis[0] = 0;
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v[0] = 1;
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for(i=0;i<=N;i++)
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{
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mindis = INF;
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mark = 0;
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for(j=0;j<=N;j++)
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if(!v[j] && dis[j] < mindis)
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{
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mindis = dis[j];
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mark = j;
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}
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v[mark] = j;
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for(j=0;j<=N;j++)
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if(!v[j] && dis[j] > dis[mark] + g[mark][j])
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dis[j] = dis[mark] + g[mark][j];
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}
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}
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int main()
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{
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int W,M,Q,i,j,d,a,b;
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while(~scanf("%d%d%d",&N,&M,&Q))
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{
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for(i=0;i<max;i++)
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for(j=0;j<max;j++)
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{
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if(i==j)g[i][j] = 0;
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else
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g[i][j] = INF;
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}
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while(M--)
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{
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scanf("%d%d%d",&a,&b,&d);
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if(d < g[a][b])
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g[a][b] = d;
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}
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scanf("%d",&W);
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while(W--)
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{
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scanf("%d",&a);
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g[0][a] = 0;
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}
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dijk();
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if(dis[Q] == INF)
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printf("-1\n");
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else
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printf("%d\n",dis[Q]);
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}
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}
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