Bus SystemTime Limit: 2000/1000 MS (Java/Others)Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 7163Accepted Submission(s): 1853
Problem Description
Because of the huge population of China, public transportation is very important. Bus is an important transportation method in traditional public transportation system. And it’s still playing an important role even now.The bus system of City X is quite strange. Unlike other city’s system, the cost of ticket is calculated based on the distance between the two stations. Here is a list which describes the relationship between the distance and the cost.
Your neighbor is a person who is a really miser. He asked you to help him to calculate the minimum cost between the two stations he listed. Can you solve this problem for him?To simplify this problem, you can assume that all the stations are located on a straight line. We use x-coordinates to describe the stations’ positions.
Input
The input consists of several test cases. There is a single number above all, the number of cases. There are no more than 20 cases.Each case contains eight integers on the first line, which are L1, L2, L3, L4, C1, C2, C3, C4, each number is non-negative and not larger than 1,000,000,000. You can also assume that L1<=L2<=L3<=L4.Two integers, n and m, are given next, representing the number of the stations and questions. Each of the next n lines contains one integer, representing the x-coordinate of the ith station. Each of the next m lines contains two integers, representing the start point and the destination.In all of the questions, the start point will be different from the destination.For each case,2<=N<=100,0<=M<=500, each x-coordinate is between -1,000,000,000 and 1,000,000,000, and no two x-coordinates will have the same value.
Output
For each question, if the two stations are attainable, print the minimum cost between them. Otherwise, print “Station X and station Y are not attainable.” Use the format in the sample.
Sample Input
21 2 3 4 1 3 5 74 212341 44 11 2 3 4 1 3 5 74 1123101 4
Sample Output
Case 1:The minimum cost between station 1 and station 4 is 3.The minimum cost between station 4 and station 1 is 3.Case 2:Station 1 and station 4 are not attainable.
数据类型用long long。INF设置成千亿最好，，，我百亿貌似都WA了。
还有输入输出用%I64d。。。
剩下的就是Floyd干的事了。
代码：
#include <stdio.h>#include <limits.h>#define INF 110000000000typedef long long ll ;ll graph[110][110] , p[110];//bool visited[110] ;ll min(ll a , ll b){return a>b?b:a ;}void floyd(int n){for(int k = 1 ; k <= n ; ++k){for(int i = 1 ; i <= n ; ++i){for(int j = 1 ; j <= n ; ++j){graph[i][j] = min(graph[i][j],graph[i][k]+graph[k][j]) ;}}}}int main(){int t , c = 1;scanf("%d",&t) ;while(t–){ll l1,l2,l3,l4,c1,c2,c3,c4 ;scanf("%I64d%I64d%I64d%I64d%I64d%I64d%I64d%I64d",&l1,&l2,&l3,&l4,&c1,&c2,&c3,&c4) ;int n , m ;scanf("%d%d",&n,&m) ;for(int i = 1 ; i <= n ; ++i){scanf("%I64d",&p[i]) ;}for(int i = 1 ; i <= n ; ++i){graph[i][i] = 0 ;for(int j = 1 ; j < i ; ++j){ll dis = p[i]-p[j] ;dis = dis>0?dis:-dis ;if(dis<=l1){graph[i][j] = graph[j][i] = c1 ;}else if(dis<=l2){graph[i][j] = graph[j][i] = c2 ;}else if(dis<=l3){graph[i][j] = graph[j][i] = c3 ;}else if(dis<=l4){graph[i][j] = graph[j][i] = c4 ;}else{graph[i][j] = graph[j][i] = INF ;}}}floyd(n) ;printf("Case %d:\n",c++) ;for(int i = 0 ; i < m ; ++i){int s , t ;scanf("%d%d",&s,&t) ;if(graph[s][t] >= INF){printf("Station %d and station %d are not attainable.\n",s,t) ;}else{printf("The minimum cost between station %d and station %d is %I64d.\n",s,t,graph[s][t]) ;}}}return 0 ;}与君共勉
享受每一刻的感觉，欣赏每一处的风景，这就是人生。
