oooccc1 is a Software Engineer who has to ride to the work place every Monday through Friday. For a long period, he went to office with the shortest path because he loves to sleep late-Time goes by, he find that he should have some changes as you cou…

http://acm.hdu.edu.cn/showproblem.php?pid=3191 求次短路的长度和个数 相关分析在这里http://blog.csdn.net/u012774187/article/details/40681515 #pragma comment(linker, "/STACK:36777216") #pragma GCC optimize ("O2") #include <cstdio> #include <cstdl…

4020求次短路的长度 难度级别:C: 运行时间限制:1000ms: 运行空间限制:51200KB: 代码长度限制:2000000B 试题描述 在一个地图上共有N个路口(编号分别为1到N),R条道路(道路均可以双向通行).问1号路口到N号路口的次短路长度是多少?次短路指的是比最短路长度长的次短的路径.同一条边可以经过多次. 输入 第一行包括两个整数N.R,接下来的R行,每行三个数x,y和m,表示第x号路口到第y号路口的距离是m. 输出 一个数,表示次短路的长度. 输入示例 4 41 2 1002…

题目链接: 题目 E. Paths and Trees time limit per test 3 seconds memory limit per test 256 megabytes inputstandard input outputstandard output 问题描述 Little girl Susie accidentally found her elder brother's notebook. She has many things to do, more important…

E. Paths and Trees time limit per test: 3 seconds memory limit per test: 256 megabytes input: standard input output: standard output Little girl Susie accidentally found her elder brother's notebook. She has many things to do, more important than sol…

E. Paths and Trees time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output Little girl Susie accidentally found her elder brother's notebook. She has many things to do, more important than solving…

[题目大意] 题目将从某点出发的所有最短路方案中,选择边权和最小的最短路方案,称为最短生成树. 题目要求一颗最短生成树,输出总边权和与选取边的编号.[题意分析] 比如下面的数据: 5 5 1 2 2 2 3 2 3 4 16 1 5 18 4 5 2 1 这个图对于从 1 出发,有两种最短路. 这种最短路方案中 dis[2]=2,dis[3]=4,dis[4]=20,dis[5]=18.边权总和 Sum=44 但如果这样选边,1点到各点的距离依然为最短路,但Sum降为了24. 那么如何选择到最优…

题目大意: 希望求出走出最短路的方法总数,如果次短路只比最短路小1,那也是可取的 输出总的方法数 这里n个点,每个点有最短和次短两种长度 这里采取的是dijkstra的思想,相当于我们可以不断找到更新到的最短长度来更新其他长度,保证之前的所有可取的最短长度都已经更新的情况下,这样是除了第一个点的最短路为0已知,还需要更新2*n-1次,如果从一个点的位置出发更新了其他点,那么这个位置就不再作为可更新点--这里都是暴力找最优的可更新的点--不知道如何做到像普通的dijkstra那种log级别的找点-…

Two Paths Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 153428/153428 K (Java/Others) Total Submission(s): 2184 Accepted Submission(s): 856 Problem Description You are given a undirected graph with n nodes (numbered from 1 to n) and m edges. A…

hdu3191题意:求出次短路的长度和条数 #include<iostream> #include<cstdio> #include<cstring> #include<queue> #include<vector> using namespace std; const int MAXN=55; const int inf=1<<30; struct Edge{ int v,w; }; vector<Edge>vet[MA…