Roadblocks Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 16425   Accepted: 5797 Description Bessie has moved to a small farm and sometimes enjoys returning to visit one of her best friends. She does not want to get to her old home too…

解决方案有许多美丽的地方.让我们跳回到到达终点跳回(例如有两点)....无论如何,这不是最短路,但它并不重要.算法能给出正确的结果 思考:而最短的路到同一点例程.spfa先正达恳求一次,求的最短路径的再次的相反,然后列举每个边缘<i,j>查找dist_zheng[i] + len<i,j> + dist_fan[j]的第二小值就可以! 注意不能用邻接矩阵,那样会MLE,应该用邻接表 /* poj 3255 3808K 266MS */ #include<cstdio>…

Roadblocks Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 12167   Accepted: 4300 Description Bessie has moved to a small farm and sometimes enjoys returning to visit one of her best friends. She does not want to get to her old home too…

Big Christmas Tree Time Limit: 3000MS   Memory Limit: 131072K Total Submissions: 19029   Accepted: 4058 Description Christmas is coming to KCM city. Suby the loyal civilian in KCM city is preparing a big neat Christmas tree. The simple structure of t…

Language: Default Sightseeing Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 7766   Accepted: 2766 Description Tour operator Your Personal Holiday organises guided bus trips across the Benelux. Every day the bus moves from one city S to…

Roadblocks http://poj.org/problem?id=3255 Time Limit: 2000MS   Memory Limit: 65536K       Description Bessie has moved to a small farm and sometimes enjoys returning to visit one of her best friends. She does not want to get to her old home too quick…

http://poj.org/problem?id=3255 这道题还是有点难度 要对最短路径的算法非常的了解 明晰 那么做适当的修改 就可以 关键之处 次短的路径: 设u 到 v的边权重为cost 那么到v的次短路径要么是 到u的次短路径+cost:要么是到u的最短路径+cost; 那么就在dijkstra中 既要保存 最短路径的数组 又要 保存次短路径的情况 #include <iostream> #include <stdio.h> #include <string.h…

Roadblocks Time Limit : 4000/2000ms (Java/Other)   Memory Limit : 131072/65536K (Java/Other) Total Submission(s) : 15   Accepted Submission(s) : 6 Problem Description Bessie has moved to a small farm and sometimes enjoys returning to visit one of her…

Roadblocks Time Limit: 2000MS Memory Limit: 65536K Total Submissions: 13216 Accepted: 4660 Description Bessie has moved to a small farm and sometimes enjoys returning to visit one of her best friends. She does not want to get to her old home too quic…

题目链接 Description Bessie has moved to a small farm and sometimes enjoys returning to visit one of her best friends. She does not want to get to her old home too quickly, because she likes the scenery along the way. She has decided to take the second-s…