HDU 2680 Choose the best route (dijkstra+ Priority queue Optimization)

Choose the best route

Problem Descriptionone Day, Kiki wants to visit one of her friends. As she is liable to carsickness, she wants to arrive at her friend's home as soon as possible. Now give your a map of the city ' s traffic route, and the stations which is near Kiki's home so, she can take. Suppose Kiki can change the bus at any station. Please find the least time Kiki needs to spend. To make it easy, if the city has n bus stations, the stations would been expressed as an integer 1,2,3...N.

Inputthere is several test cases.
Each case begins with three integers n, m and S, (N<1000,M<20000,1=<S<=N) n stands for the number of bus statio NS in this city and M stands for the number of directed ways between bus stations. (maybe there is several ways between, bus stations.) s stands for the bus station that near Kiki ' s friend's home.
Then follow m lines, each line contains three integers p, q, T (0<t<=1000). means from station p to station Q there is a and it'll costs T minutes.
Then a line with an integer w (0<w<n), means the number of stations Kiki can take at the beginning. Then follows W integers stands for these stations.

Outputthe output contains one line for each data set:the least time Kiki needs to spend, if it's impossible to find such A route, just output "-1".

Sample INPUT5 8 51 2 21 5 31 3 42 4 72 5 62 3 53 5 14 5 122 34 3 41 2 31 3 42 3 211

Sample output1-1

1#include <cstdio>2#include <cstring>3#include <queue>4#include <vector>5#include <algorithm>6 using namespacestd;7 8 structEdge9 {Ten     intu,v,w; OneEdgeintUintVintW): U (U), V (v), W (w) {}; A }; -  - structHeapnode the { -     intu,d; -     BOOL operator< (Constheapnode& temp)Const -     { +         returnD>TEMP.D; -     } + }; A  atvector<int>g[1005]; -Vector<edge>edges; - Const intinf=0x3f3f3f3f; - intvis[1005]; - intd[1005]; - intEd; in intM,n; -  to voidInit () + { -      for(intI=1; i<=m;i++) the g[i].clear (); * edges.clear (); $ }Panax Notoginseng  - voidAddedge (intUintVintW) the { + Edges.push_back (Edge (U,v,w)); A     intm=edges.size (); theG[u].push_back (M-1); + } -  $ voidDijkstrainted) $ { -memset (Vis,0,sizeof(Vis)); -Priority_queueQ; theQ.push ((Heapnode) {ed,0}); -      for(intI=1; i<=m;i++)Wuyid[i]=inf; thed[ed]=0; -      while(!q.empty ()) Wu     { -         intu=q.top (). u; About Q.pop (); $         if(Vis[u]) -             Continue; -vis[u]=1; -          for(intI=0; I<g[u].size (); i++) A         { +edge& e=Edges[g[u][i]]; the             if(d[e.v]>d[u]+E.W) -             { $d[e.v]=d[u]+E.W; the Q.push ((heapnode) {E.V,D[E.V]}); the             } the         } the     } - } in  the intMain () the { About     intSt,a,b,c,num; the      while(SCANF ("%d%d%d", &m,&n,&ed)! =EOF) the     { the init (); +          for(intI=0; i<n;i++) -         { thescanf"%d%d%d",&a,&b,&c);Bayi Addedge (b,a,c); the         } the Dijkstra (ed); -scanf"%d",&num); -         intans=inf; the          while(num--) the         { thescanf"%d",&St); theans=min (ans,d[st]); -         } the         if(ans==inf) theprintf"-1\n"); the         Else94printf"%d\n", ans); the     } the     return 0; the}

HDU 2680 Choose the best route (dijkstra+ Priority queue Optimization)