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  • pat1030. Travel Plan (30)

    1030. Travel Plan (30)

    时间限制
    400 ms
    内存限制
    65536 kB
    代码长度限制
    16000 B
    判题程序
    Standard
    作者
    CHEN, Yue

    A traveler's map gives the distances between cities along the highways, together with the cost of each highway. Now you are supposed to write a program to help a traveler to decide the shortest path between his/her starting city and the destination. If such a shortest path is not unique, you are supposed to output the one with the minimum cost, which is guaranteed to be unique.

    Input Specification:

    Each input file contains one test case. Each case starts with a line containing 4 positive integers N, M, S, and D, where N (<=500) is the number of cities (and hence the cities are numbered from 0 to N-1); M is the number of highways; S and D are the starting and the destination cities, respectively. Then M lines follow, each provides the information of a highway, in the format:

    City1 City2 Distance Cost

    where the numbers are all integers no more than 500, and are separated by a space.

    Output Specification:

    For each test case, print in one line the cities along the shortest path from the starting point to the destination, followed by the total distance and the total cost of the path. The numbers must be separated by a space and there must be no extra space at the end of output.

    Sample Input
    4 5 0 3
    0 1 1 20
    1 3 2 30
    0 3 4 10
    0 2 2 20
    2 3 1 20
    
    Sample Output
    0 2 3 3 40
    

    提交代码

      1 #include<cstdio>
      2 #include<algorithm>
      3 #include<iostream>
      4 #include<cstring>
      5 #include<queue>
      6 #include<vector>
      7 #include<stack>
      8 using namespace std;
      9 #define inf 260000 
     10 int dist[505],cost[505];
     11 struct node{
     12     int v,dist,cost;
     13     node *next;
     14     node(){
     15         next=NULL;
     16     }
     17 };
     18 int main(){
     19     //freopen("D:\input.txt","r",stdin);
     20     int n,m,s,d;
     21     scanf("%d %d %d %d",&n,&m,&s,&d);
     22     node *h=new node[n];
     23     int *fr=new int[n];
     24     int i,a,b,dis,c;
     25     node *p;
     26     
     27     //cout<<n<<endl;
     28     
     29     for(i=0;i<m;i++){
     30         scanf("%d %d %d %d",&a,&b,&dis,&c);
     31         p=new node();
     32         p->v=b;
     33         p->dist=dis;
     34         p->cost=c;
     35         p->next=h[a].next;
     36         h[a].next=p;
     37         
     38         p=new node();
     39         p->v=a;
     40         p->dist=dis;
     41         p->cost=c;
     42         p->next=h[b].next;
     43         h[b].next=p;
     44     }
     45     
     46     for(i=0;i<n;i++){
     47         dist[i]=cost[i]=inf;
     48         fr[i]=i;
     49     }
     50     //memset(dist,-1,sizeof(dist));
     51     //memset(cost,-1,sizeof(cost));
     52     dist[s]=cost[s]=0;
     53     //int totaldist=0,totalcost=0;
     54     
     55     //cout<<n<<endl;
     56     
     57     int e=s;
     58     while(e!=d){
     59         p=h[e].next;
     60         while(p){
     61             if(dist[p->v]>dist[e]+p->dist){
     62                 dist[p->v]=dist[e]+p->dist;
     63                 cost[p->v]=cost[e]+p->cost;
     64                 fr[p->v]=e;
     65             }
     66             else{
     67                 if(dist[p->v]==dist[e]+p->dist&&cost[p->v]>cost[e]+p->cost){
     68                     cost[p->v]=cost[e]+p->cost;
     69                     fr[p->v]=e;
     70                 }
     71             }
     72             p=p->next;
     73         }
     74         dist[e]=0;
     75         
     76         int mindist=inf,mincost=inf;
     77         for(i=0;i<n;i++){
     78                 if(dist[i]&&dist[i]<mindist){
     79                     mindist=dist[i];
     80                     mincost=cost[i];
     81                     e=i;
     82                 }
     83                 else{
     84                     if(dist[i]&&dist[i]==mindist&&cost[i]<mincost){
     85                         mincost=cost[i];
     86                         e=i;
     87                     }
     88                 }
     89         }
     90     }
     91     stack<int> ss;
     92     int fro=d;
     93     while(fr[fro]!=fro){
     94         ss.push(fro);
     95         fro=fr[fro];
     96     }
     97     ss.push(fro);
     98     printf("%d",ss.top());
     99     ss.pop();
    100     while(!ss.empty()){
    101         printf(" %d",ss.top());
    102         ss.pop();
    103     }
    104     printf(" %d %d
    ",dist[d],cost[d]);
    105     delete []fr;
    106     delete []h;
    107     return 0;
    108 }
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  • 原文地址:https://www.cnblogs.com/Deribs4/p/4767946.html
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