最短路. 记录一下到某个点,最后是哪辆车乘到的最短距离.换乘次数以及从哪个位置推过来的,可以开$map$记录一下. #include<map> #include<set> #include<ctime> #include<cmath> #include<queue> #include<string> #include<stack> #include<vector> #include<cstdio>…

可以转到我的CSDN查看同样的文章https://blog.csdn.net/weixin_44385565/article/details/89003683 1131 Subway Map (30 分) In the big cities, the subway systems always look so complex to the visitors. To give you some sense, the following figure shows the map of Beijing…

PAT甲级1131. Subway Map 题意: 在大城市,地铁系统对访客总是看起来很复杂.给你一些感觉,下图显示了北京地铁的地图.现在你应该帮助人们掌握你的电脑技能!鉴于您的用户的起始位置,您的任务是找到他/她目的地的最快方式. 输入规格: 每个输入文件包含一个测试用例.对于每种情况,第一行包含正整数N(<= 100),地铁线数.然后N行跟随,第i(i = 1,...,N)行以格式描述第i条地铁线: M S [1] S [2] ... S [M] 其中M(<= 100)是停止次数,S [i…

In the big cities, the subway systems always look so complex to the visitors. To give you some sense, the following figure shows the map of Beijing subway. Now you are supposed to help people with your computer skills! Given the starting position of…

In the big cities, the subway systems always look so complex to the visitors. To give you some sense, the following figure shows the map of Beijing subway. Now you are supposed to help people with your computer skills! Given the starting position of…

In the big cities, the subway systems always look so complex to the visitors. To give you some sense, the following figure shows the map of Beijing subway. Now you are supposed to help people with your computer skills! Given the starting position of…

In the big cities, the subway systems always look so complex to the visitors. To give you some sense, the following figure shows the map of Beijing subway. Now you are supposed to help people with your computer skills! Given the starting position of…

题目:https://pintia.cn/problem-sets/994805342720868352/problems/994805347523346432 题意: 告诉你一个地铁线路图,站点都是用四位数来编号. 现在问你从某一起点到某一终点,经过站数最少的乘车方式是什么?要输出方案. 如果站数相同要输出换乘较少的. 思路: 首先肯定是搜索没有问题了.因为要输出方案,所以bfs不太方便存答案.很容易想到用dfs 比较麻烦的是输出方案的时候,线路相同的那些站都合并在同一个线路里了.那么我们就再…

题意:给出起点和终点,计算求出最短路径(最短路径即所经过的站点最少的),若最短路径不唯一,则选择其中换乘次数最少的一条线路. 思路:本题虽然也是求最短路径,但是此路径是不带权值的,路径长度即所经过的边数,故可以用DFS来求解,而不是用一般的Dijkstra之类的.相信若只是求最短路径,大多数人都会做,就是从起点start开始深度遍历,遍历到终点end时,与全局变量进行比较.更新.本题的关键是,更新最优路径时需要比较“换乘次数”,如何求解它呢?我是这么思考的——首先,考虑用一个二维数组int mp…

明天就要考PAT,为了应付期末已经好久没有刷题了啊啊啊啊,今天开了一道最短路,状态不是很好 1.没有读清题目要求,或者说没有读完题目,明天一定要注意 2.vis初始化的时候从1初始化到n,应该从0开始,以后初始化就从0到n即可 题目大意:给一张地图,两个结点中既有距离也有时间,有的单行有的双向,要求根据地图推荐两条路线:一条是最快到达路线,一条是最短距离的路线. 第一行给出两个整数N和M,表示地图中地点的个数和路径的条数.接下来的M行每一行给出:道路结点编号V1 道路结点编号V2 是否单行线 道…