题目描述:Kiki想去他的一个朋友家,他的朋友家包括所有的公交站点一共有n 个,一共有m条线路,线路都是单向的,然后Kiki可以在他附近的几个公交站乘车,求最短的路径长度是多少. 解题报告:这道题的特点就是有多个起点,但是这并不影响我们使用迪杰斯特拉来解这道题,和前面出现的一个题目一样,我们可以增加一个虚拟的起点,然后令所有的真实的起点到这个虚拟的起点的距离都赋为1,然后就成功的转化成了单源的最短路问题了,并且是单个终点,然后用迪杰斯特拉就OK了,值得注意的就是这题里面的路线都是单向的,即所给出…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2680 Choose the best route Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 7201    Accepted Submission(s): 2350 Problem Description One day , Kiki…

题目连接 http://acm.hdu.edu.cn/showproblem.php?pid=2680 Choose the best route Description One 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 you a ma…

题意:小A要乘车到s车站,他有w个起始车站可选,问最短时间. 思路:用Floyd超时,Dijkstra遍历,但是也超时.仔细看看你会发现这道题目好像是多源点单终点问题,终点已经确定,那么我们可以直接转置邻接矩阵,从终点找最小的起点,转换成了单源最短路问题. 代码: #include<cstdio> #include<set> #include<cmath> #include<stack> #include<cstring> #include<…

题目:http://acm.hdu.edu.cn/showproblem.php?pid=2680 /************************************************************************/ /* hdu Arbitrage dijkstra算法 题目大意:dijkstra算法,求点与点之间最短距离.因为此题的起始点不定,所以可用 反向图来求得,终点确定,从终点出发,dijkstra算法,求出其他点到终点最小距离. 本题数据量较大,用fl…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2680 题目意思:实质就是给定一个多源点到单一终点的最短路. 卑鄙题---有向图.初始化map时 千万不要写成 map[i][j] = map[j][i] = X. #include <iostream> #include <cstdio> #include <cstdlib> #include <cstring> using namespace std; #de…

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 you a map of the city’s traffic route, and the stations which are near Kiki…

http://acm.hdu.edu.cn/showproblem.php?pid=2680 Problem Description One 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 you a map of the city’s tra…

Problem Description One 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 you a map of the city’s traffic route, and the stations which are near Kik…

http://acm.hdu.edu.cn/showproblem.php?pid=2680 Choose the best route Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 9602    Accepted Submission(s): 3111 Problem Description One day , Kiki wants…