题目 Input our current position and a destination, an online map can recommend several paths. Now your job is to recommend two paths to your user: one is the shortest, and the other is the fastest. It is guaranteed that a path exists for any request. I…

题目 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 destinatio…

题目 A gas station has to be built at such a location that the minimum distance between the station and any of the residential housing is as far away as possible. However it must guarantee that all the houses are in its service range. Now given the map…

题目 There is a public bike service in Hangzhou City which provides great convenience to the tourists from all over the world. One may rent a bike at any station and return it to any other stations in the city. The Public Bike Management Center (PBMC)…

题目及题解 https://blog.csdn.net/CV_Jason/article/details/81385228 迪杰斯特拉重新认识 两个核心的存储结构: int dis[n]: //记录每个点到源头的最短距离 bool mark[n]; //标记每个顶点到 /*如果想要保存路径,创建一个 二维数组,或者vector[n], 里面的每个一维数组表示到达该节点的前一个节点,在(u为当前选出的新节点)当dis[v]==dis[u]+e[u][v],说明通过u到达v的路径也是最短路径,于是把…

题目 A family hierarchy is usually presented by a pedigree tree. Your job is to count those family members who have no child. Input Each input file contains one test case. Each case starts with a line containing 0 < N < 100, the number of nodes in a t…

本文章同步发布在CSDN:https://blog.csdn.net/weixin_44385565/article/details/90041078   1111 Online Map (30 分)   Input our current position and a destination, an online map can recommend several paths. Now your job is to recommend two paths to your user: one i…

PAT甲级1111. Online Map 题意: 输入我们当前的位置和目的地,一个在线地图可以推荐几条路径.现在你的工作是向你的用户推荐两条路径:一条是最短的,另一条是最快的.确保任何请求存在路径. 输入规格: 每个输入文件包含一个测试用例.对于每种情况, 第一行给出两个正整数N(2 <= N <= 500),M分别是地图上街道交叉路口的总数和街道数.然后M行跟随,每个描述一个街道的格式: V1 V2单程长度时间 其中V1和V2是街道两端的索引(从0到N-1);一- 方式是1,如果街道从V1…

预处理出最短路再进行暴力dfs求答案会比较好.直接dfs效率太低. #include<cstdio> #include<cstring> #include<cmath> #include<vector> #include<map> #include<queue> #include<stack> #include<algorithm> using namespace std; int n,m; int st,en…

题意:给了图,以及s和t,让你求s到t花费的最短路程.最短时间,以及输出对应的路径.   对于最短路程,如果路程一样,输出时间最少的. 对于最短时间,如果时间一样,输出节点数最少的.   如果最短路程和最短时间路径一样,合并输出一次即可. 纯粹就是练习dijkstra,没什么难的. 第一次dijkstra求最短路程,记录下每个节点的路程和时间. 第二次dijkstra求最短时间,记录下每个节点的时间和经过的节点数. pre数组用来存储前驱节点,保存路径 #include <iostream>…