本文转载自:http://www.javaxxz.com/thread-359442-1-1.html Edward, the emperor of the Marjar Empire, wants to build some bidirectional highways so that he can reach other cities from the capital as fast as possible. Thus, he proposed the highway project.The…

题目大意:一张带权无向图,权有两个参数(d,c),分别表示走过这条边的时间和建造这条边的代价.要求选出一些边,使得0节点到其他点的距离之和最短,并在最短的基础上求最小代价. 题目分析:这是16年浙江省赛的一道题.先求出0到所有点的最短路,然后找出所有可能在最短路径上的边,最后在每一个节点的入边之中都选一条具有最小代价的边.多么简单的一道题!!! 代码如下: # include<iostream> # include<cstdio> # include<cstring>…

题目链接:http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=5718 题意: 有n个点 m(n,m<=10^5)条路,现在要建路,每条路连接uv两个点,所需时间是time花费是cost,现要求从0点到达其他点的,让时间和最小,当有多种选择时要求修路的总花费最小,输出最小时间及花费: 可以看成最短路问题 我们定义两个数组Time[i]表示从起点到 i 点所需的最小时间,Cost[i]表示到达 i 的那个点 u 到 i 的最小花费:…

题目链接: http://www.icpc.moe/onlinejudge/showProblem.do?problemCode=3946 题解: 用dijkstra跑单元最短路径,如果对于顶点v,存在一系列边(ui,v)使得dis[v]最小(dis[v]表示0到v的距离).这些边能且只能选一条,那么我们自然应该选cost最小的那个边了. #include<iostream> #include<cstdio> #include<cstring> #include<…

http://acm.zju.edu.cn/onlinejudge/showProblem.do?problemId=5718   Highway Project Time Limit: 2 Seconds      Memory Limit: 65536 KB Edward, the emperor of the Marjar Empire, wants to build some bidirectional highways so that he can reach other cities…

ZOJ Problem Set - 3946 Highway Project Time Limit: 2 Seconds      Memory Limit: 65536 KB Edward, the emperor of the Marjar Empire, wants to build some bidirectional highways so that he can reach other cities from the capital as fast as possible. Thus…

Highway Project Time Limit: 2 Seconds      Memory Limit: 65536 KB Edward, the emperor of the Marjar Empire, wants to build some bidirectional highways so that he can reach other cities from the capital as fast as possible. Thus, he proposed the highw…

关于几个的区别和联系:http://www.cnblogs.com/zswbky/p/5432353.html d.每组的第一行是三个整数T,S和D,表示有T条路,和草儿家相邻的城市的有S个(草儿家到这个城市的距离设为0),草儿想去的地方有D个: 求D个城市中距离草儿家最近的距离. s.进行1次单源最短路,找出距离最小的即可. c.Dijkstra单源最短路 /* Dijkstra单源最短路 权值必须是非负 单源最短路径,Dijkstra算法,邻接矩阵形式,复杂度为O(n^2) 求出源beg到所…

Highway Project Time Limit: 2 Seconds      Memory Limit: 65536 KB Edward, the emperor of the Marjar Empire, wants to build some bidirectional highways so that he can reach other cities from the capital as fast as possible. Thus, he proposed the highw…

L - Subway(最短路spfa) You have just moved from a quiet Waterloo neighbourhood to a big, noisy city. Instead of getting to ride your bike to school every day, you now get to walk and take the subway. Because you don't want to be late for class, you want…