D - Restoring Road Network Time limit : 2sec / Memory limit : 256MB Score : 500 points Problem Statement In Takahashi Kingdom, which once existed, there are N cities, and some pairs of cities are connected bidirectionally by roads. The following are…

问题 C: Restoring Road Network 时间限制: 1 Sec  内存限制: 128 MB提交: 731  解决: 149[提交] [状态] [讨论版] [命题人:admin] 题目描述 In Takahashi Kingdom, which once existed, there are N cities, and some pairs of cities are connected bidirectionally by roads. The following are kn…

个人心得:看懂题目花费了不少时间,后面实现确实时间有点仓促了,只是简单的做出了判断是否为真假的情况, 后面看了题解发现其实在判断时候其实能够一起解决的,算了,基础比较差还是慢慢的来吧. 题意概述: 就是给定一个N阶方阵,规定Auv,为u到v的最短路径,若给出的数据存在其他通路少于此时的值则不存在即为假, 解决方法就是利用Floyd算法进行单源最短路的判断,只要后面的矩阵与原来的不相符就是假的.真的的时候,是要求 存在的最短总路程使得矩阵的数成立,我画了下就是只要存在从其他城市能够转到目的地的时候…

题意 有一张无向带权连通图(点数<=300),给出任意两点i,j之间的最短路长度dis[i][j].问是否存在一张这样的无向图.如果不存在输出-1.如果存在输出所有这样的无向图中边权和最小的一张的边权和. 分析 如果存在i,j,k(i,j,k互不相同)使得dis[i][k]+dis[k][j]<dis[i][j]那么一定不存在.否则一定存在. 对于i,j(i!=j),如果存在第三个点k使得dis[i][k]+dis[k][j]=dis[i][j],那么为了总的边权和最小,i和j必然没有连边,i…

[算法]图论,最短路? [题意]原图为无向连通图,现给定原图的最短路矩阵,求原图最小边权和,n<=300. [题解]要求最小边权和下,原图的所有边一定是所连两端点的最短路. 那么现在将所有最短路作为边加入原图,考虑删边. 对于(u,v),若存在点w使得(u,v)=(u,w)+(w,v),则(u,v)可以删去.(btw,若是>则无解) 复杂度O(n^3). #include<cstdio> #include<cstring> #include<cctype>…

[链接]h在这里写链接 [题意] 给你任意两点之间的最短路. 让你求出原图. 或者输出原图不存在. 输出原图的边长总和的最小值. [题解] floyd算法. 先在原有的矩阵上. 做一遍floyd. 如果还能扩展. 也即存在w[i][j] > w[i][k]+w[k][j]; 则无解. 否则. 先把所有w[i][j]加上(i<j),记为ans; 也即先在任意两点之间都连一条边.边的长度对应了两点之间最短路. 然后考虑什么时候可以减少一条边. 可以在做floyd的时候. 如果出现w[i][j] =…

[Arc083D/At3535] 有 \(N\) 个城市,城市与城市之间用长度为整数的无向道路连接. 现有一考古学家找到了一张 \(N×N\) 的表 \(A\) ,这张表代表了这 \(N\) 座城市两两之间的最短路.即表中的第 \(u\) 行第 \(v\)列的值代表了从城市 \(u\)到\(v\)的最短路长度. 问能否根据这张表,求出高桥王国的最小道路长度总和. ---------- 考虑到原图中的边一定就在这个最短路矩阵中,我们只需要保留其中的一些,让它们"表示"出其它就可以了 那么…

Original article published here, Posted on March 18, 2009 by lidar A positive feedback loop is beginning to develop with readers submitting information. There is a LIDAR textbook that I just became aware of and 2 new digital documentation conferences…

贵有恒,何必三更起五更眠:最无益,莫过一日曝十日寒. 问题 C: Restoring Road Network 问题 C: Restoring Road Network 时间限制: 1 Sec  内存限制: 128 MB提交: 896  解决: 184[提交] [状态] [讨论版] [命题人:admin] 题目描述 In Takahashi Kingdom, which once existed, there are N cities, and some pairs of cities are…

C - Sugar Water 计算一下可以达到水是多少,可以到达的糖是多少 枚举水,然后加最多能加的糖,是\(min(F - i *100,E * 100)\),计算密度,和前一个比较就行 #include <bits/stdc++.h> #define fi first #define se second #define pii pair<int,int> #define mp make_pair #define pb push_back #define space putch…

C - Sugar Water Time limit : 3sec / Memory limit : 256MB Score : 300 points Problem Statement Snuke is making sugar water in a beaker. Initially, the beaker is empty. Snuke can perform the following four types of operations any number of times. He ma…

Ikki's Story I - Road Reconstruction Time Limit: 2000MS   Memory Limit: 131072K Total Submissions: 7659   Accepted: 2215 Description Ikki is the king of a small country – Phoenix, Phoenix is so small that there is only one city that is responsible fo…

Ikki's Story I - Road Reconstruction Time Limit: 2000MS   Memory Limit: 131072K Total Submissions: 7971   Accepted: 2294 Description Ikki is the king of a small country – Phoenix, Phoenix is so small that there is only one city that is responsible fo…

Reverse a Road II Time Limit: 10000ms, Special Time Limit:25000ms, Memory Limit:65536KB Total submit users: 10, Accepted users: 6 Problem 13411 : No special judgement Problem description JAG Kingdom is a strange kingdom such that its N cities are con…

poj   1251  Jungle Roads  (最小生成树) Link: http://poj.org/problem?id=1251 Jungle Roads Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 23507   Accepted: 11012 Description The Head Elder of the tropical island of Lagrishan has a problem. A b…

Jungle Roads Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others)Total Submission(s): 7096    Accepted Submission(s): 5185 Problem Description The Head Elder of the tropical island of Lagrishan has a problem. A burst of…

1. 3D分析 1.1. 3D Features toolset 工具 工具 描述 3D Features toolset (3D 要素工具集) Add Z Information 添加 Z 信息 添加关于具有 Z 值的要素类中的要素的高程属性的信息. Buffer 3D 3D 缓冲 围绕点或线创建三维缓冲区以生成球形或圆柱形的多面体要素. Difference 3D 3D 差异 消除目标要素类中部分与减法要素类中闭合的多面体要素体积重叠的多面体要素. Enclose Multipatch 封闭…

一个针对出租车司机有效花费的推荐系统 摘要 GPS技术和新形式的城市地理学改变了手机服务的形式.比如说,丰富的出租车GPS轨迹使得出做租车领域有新方法.事实上,最近很多工作是在使用出租车GPS轨迹数据来开发手机推荐系统.这些系统可以推荐一系列的载客点,为了使得在最短的驾驶距离里最大可能地找到一个乘客.然而,在现实世界中,出租车的收入和有效的驾驶时间息息相关.换句话说,对一个出租车司机来说,在找到一个乘客前知道一个确切地驾驶路径来缩短驾驶时间更加重要.最后,在本文中,我们提出了开发一个收益比高的推…

文章目录 1. 1. 摘要 2. 2. Map-Matching(MM)问题 3. 3. 隐马尔科夫模型(HMM) 3.1. 3.1. HMM简述 3.2. 3.2. 基于HMM的Map-Matching 3.3. 3.3. Viterbi算法 4. 4. 相关部分论文工作 4.1. 4.1. A HMM based MM for wheelchair navigation 4.2. 4.2. MM for low-sampling-rate GPS trajectories 4.3. 4.3.…

D. Fools and Foolproof Roads   You must have heard all about the Foolland on your Geography lessons. Specifically, you must know that federal structure of this country has been the same for many centuries. The country consists of n cities, some pairs…

Description The Head Elder of the tropical island of Lagrishan has a problem. A burst of foreign aid money was spent on extra roads between villages some years ago. But the jungle overtakes roads relentlessly, so the large road network is too expensi…

Description The Head Elder of the tropical island of Lagrishan has a problem. A burst of foreign aid money was spent on extra roads between villages some years ago. But the jungle overtakes roads relentlessly, so the large road network is too expensi…

Description through n) and m bidirectional railways. There is also an absurdly simple road network — for each pair of different towns x and y, there is a bidirectional road between towns x and yif and only if there is no railway between them. Travell…

D - Jungle Roads Time Limit:1000MS     Memory Limit:10000KB     64bit IO Format:%I64d & %I64u Submit Status Practice POJ 1251 Description The Head Elder of the tropical island of Lagrishan has a problem. A burst of foreign aid money was spent on extr…

9852303 2013-12-18 11:47:01 Accepted 1301 0MS 264K 1117 B C++ 泽泽 Jungle Roads Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/32768 K (Java/Others) Total Submission(s): 3835    Accepted Submission(s): 2797 Problem Description The Head E…

Caravans Time limit: 1.0 secondMemory limit: 64 MB Student Ilya often skips his classes at the university. His friends criticize him for this, but they don't know that Ilya spends this time not watching TV serials or listening to music. He creates a…

题目链接: http://codeforces.com/problemset/problem/208/C C. Police Station time limit per test:2 secondsmemory limit per test:256 megabytes 问题描述 The Berland road network consists of n cities and of m bidirectional roads. The cities are numbered from 1 to…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1301 The Head Elder of the tropical island of Lagrishan has a problem. A burst of foreign aid money was spent on extra roads between villages some years ago. But the jungle overtakes roads relentlessly,…

Merry Christmas Time Limit : 8 sec, Memory Limit : 65536 KB Problem J: Merry Christmas International Christmas Present Company (ICPC) is a company to employ Santa and deliver presents on Christmas. Many parents request ICPC to deliver presents to the…

A. The Two Routes time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output In Absurdistan, there are n towns (numbered 1 through n) and m bidirectional railways. There is also an absurdly simple ro…