题目链接:点击打开链接 题目需要求从原点到所有点的最短距离之和和所有点到原点的最短距离之和,在求所有点到原点最短距离的时候用到了一个技巧:即把图反向,求原点到所有其他点的最短距离,这样用一次SPFA就可以将所有点到原点的最短距离求出来了. 另外也没什么好说的,纯SPFA.另外用优化到VlogE的dijkstra貌似也能过,有空的时候再写个. 代码如下: #include <iostream> #include <algorithm> #include <string>…

Invitation Cards Time Limit : 16000/8000ms (Java/Other)   Memory Limit : 524288/262144K (Java/Other) Total Submission(s) : 7   Accepted Submission(s) : 1 Problem Description In the age of television, not many people attend theater performances. Antiq…

Time Limit: 8000MS   Memory Limit: 262144K Total Submissions: 17538   Accepted: 5721 Description In the age of television, not many people attend theater performances. Antique Comedians of Malidinesia are aware of this fact. They want to propagate th…

Invitation Cards Time Limit: 8000MS Memory Limit: 262144K Total Submissions: 24460 Accepted: 8091 Description In the age of television, not many people attend theater performances. Antique Comedians of Malidinesia are aware of this fact. They want to…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=1535 Problem Description In the age of television, not many people attend theater performances. Antique Comedians of Malidinesia are aware of this fact. They want to propagate theater and, most of all,…

题目链接: http://poj.org/problem?id=1511 题目大意: 这道题目比较难理解,我读了好长时间,最后还是在队友的帮助下理解了题意,大意就是,以一为起点,求从一到其他各点的最短回路总和. 解题思路: 解决这个题目有几个容易错的,解决了离ac就不远了^_^. 1:数据范围是1<=边数<=顶点数<=1000000,所以不能用邻接矩阵,要用邻接表,用vector实现时要动态申请内存. 2:求得是起始点到其他点的最短回路和,我们可以建两个邻接表(一个正向,一个负向邻接表)…

POJ 1511 Invitation Cards / UVA 721 Invitation Cards / SPOJ Invitation / UVAlive Invitation Cards / SCU 1132 Invitation Cards / ZOJ 2008 Invitation Cards / HDU 1535 (图论,最短路径) Description In the age of television, not many people attend theater perfor…

原题目:http://poj.org/problem?id=1511 给出一个有向图,求出这个图从1到所有点的最短路径和所有点到1的最短路径的和. 这题数据量有点大,数据范围也大,所以用SPFA+邻接表做. 各种限制:Time Limit: 8000MS    Memory Limit: 262144K(折腾评测机概念啊) 输入没什么处理的,注意在求所有点到1最短路径和的思想,嫑一看每个点都要是源点Floyd去了..你想想,只要你把有向图所有箭头改一个方向,不又是从1到所有点的最短路径了么!?…

昨天的题太水了,堆优化跑的不爽,今天换了一个题,1000000个点,1000000条边= = 试一试邻接表 写的过程中遇到了一些问题,由于习惯于把数据结构封装在 struct 里,结果 int [1000000] 导致 struct 爆栈,此问题亟待解决.. 实力碾压SPFA 2500 ms,有图为证 #include <cstdio> #include <cstdlib> #include <cstring> #include <algorithm> #d…

原题: Invitation Cards Time Limit: 8000MS   Memory Limit: 262144K Total Submissions: 31230   Accepted: 10366 Description In the age of television, not many people attend theater performances. Antique Comedians of Malidinesia are aware of this fact. The…