hdu 5552 Bus Routes 考虑有环的图不方便,可以考虑无环连通图的数量,然后用连通图的数量减去就好了. 无环连通图的个数就是树的个数,又 prufer 序我们知道是 $ n^{n-2} $ 其中又由于有 $ n-1 $ 个边,每个边可以涂色,所以总共无环的方案数量是 $ m^{n-1} n^{n-2} $ 那么现在就要算连通图的数量了.这个不如不连通图的数量好算. 不连通图的数量怎么算呢,原本想的是容斥,但是貌似不好实现,看了题解发现一种神仙思路.考虑固定一个点,并且让这个点连出一…

题意 给定 \(n\) 个点,任意连边,每条边有 \(m\) 种颜色可选,求带环连通图的方案数. \(1\leq n\leq 10000\) \(1\leq m < 2^{31}\) 思路 直接求带环连通图显然比较难求,正难则反,考虑容斥.用连通图的个数减去无环连通图(树)的个数. \(n\) 个节点的无根树,每个节点有区别,可以直接套用公式 \(n^{n-2}\) .而再考虑边的颜色,就是 \(m^{n-1}n^{n-2}\) . 我们设 \(n\) 个点,考虑边的颜色,构成不同连通图的方案数…

题意  给定n个点,任意两点之间可以不连边也可以连边.如果连边的话可以染上m种颜色. 求最后形成的图,是一个带环连通图的方案数. 首先答案是n个点的图减去n个点能形成的树. n个点能形成的树的方案数比较好求,根据prufer序列可以知道n个点形成的无根树的个数为$n^{n-2}$ 那么现在问题变成求n个点形成的连通图的个数. 图有连通和不连通的,那么就是图的总数减去不连通的图的总数. 图的总数很简单,$m^{\frac{n(n-1)}{2}}$,那么现在要求不连通的图的总数. 设$f(n)$为$…

1137. Bus Routes Time limit: 1.0 secondMemory limit: 64 MB Several bus routes were in the city of Fishburg. None of the routes shared the same section of road, though common stops and intersections were possible. Fishburg old residents stated that it…

We have a list of bus routes. Each routes[i] is a bus route that the i-th bus repeats forever. For example if routes[0] = [1, 5, 7], this means that the first bus (0-th indexed) travels in the sequence 1->5->7->1->5->7->1->... forever…

We have a list of bus routes. Each routes[i]is a bus route that the i-th bus repeats forever. For example if routes[0] = [1, 5, 7], this means that the first bus (0-th indexed) travels in the sequence 1->5->7->1->5->7->1->... forever.…

We have a list of bus routes. Each routes[i] is a bus route that the i-th bus repeats forever. For example if routes[0] = [1, 5, 7], this means that the first bus (0-th indexed) travels in the sequence 1->5->7->1->5->7->1->... forever…

We have a list of bus routes. Each routes[i] is a bus route that the i-th bus repeats forever. For example if routes[0] = [1, 5, 7], this means that the first bus (0-th indexed) travels in the sequence 1->5->7->1->5->7->1->... forever…

题目如下: We have a list of bus routes. Each routes[i] is a bus route that the i-th bus repeats forever. For example if routes[0] = [1, 5, 7], this means that the first bus (0-th indexed) travels in the sequence 1->5->7->1->5->7->1->... f…

Bus Fair Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 600    Accepted Submission(s): 293 Problem Description You are now in Foolish Land. Once moving in Foolish Land you found that there is…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=1690 Bus System Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 6569    Accepted Submission(s): 1692 Problem Description Because of the huge popula…

Problem Description Because of the huge population of China, public transportation is very important. Bus is an important transportation method in traditional public transportation system. And it's still playing an important role even now. The bus sy…

Bus System Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 6082    Accepted Submission(s): 1560 Problem Description Because of the huge population of China, public transportation is very importa…

今天玩魔灵玩多了,耽误了时间,回去宿舍又没电. /*********************************************/ Bus Fair Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 900    Accepted Submission(s): 444 Problem Description You are no…

Bus Pass Time Limit: 10000/5000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 667    Accepted Submission(s): 271 Problem Description You travel a lot by bus and the costs of all the seperate tickets are starting to…

题目大意:给出若干巴士不同价格的票的乘坐距离范围,现在有N个站点,有M次询问,查询任意两个站点的最小花费 解析:由于是多次查询不同站点的最小花费,所以用弗洛伊德求解 时间复杂度(O^3) 比较基础的弗洛伊德 #include <iostream> #include <cstdio> #include <cstring> using namespace std; #define INF 1000000000000 typedef __int64 LL; ; __int64…

1137 做过一样的 怎么又忘了 再一次搜超时 不用回溯 #include <iostream> #include<cstdio> #include<cstring> #include<algorithm> #include<stdlib.h> #include<vector> #include<queue> using namespace std; #define N 10010 int n,m; vector<i…

Problem - 4179 坑了我一个晚上的SP题. 题意是,给出若干空间中的点,给出其中某些点之间是有直线线段路径相连的.要求求出一条从s开始到t结束的路径,它的难度是d.难度的计算是空间线段两点的高度差乘以100再除以投影到xOy平面上线段的长度.难度是d的路径的定义是路径中,经过的线段的难度最大是d. 其实比较容易可以想到的是枚举难度最大的线段的,同时构建难度小于等于给定值的正图和反图.正图是用来求出起点s到各个顶点的最短距离,因为是有向图,所以求出t到各个顶点的最短距离是要用到反图来求…

CDQ学习资料 day1cdq分治相关 CDQ的IOI论文 1.优化斜率dp 左边对右边影响维护一个凸包解决 需要知识:①凸包②斜率dp 题目:√ HDU3842 Machine Works   HYSBZ 1492 货币兑换Cash 2.三维/多维偏序 cdq降维,剩下用数据结构维护. 需要知识:①LIS②偏序关系③二维线段树/树状数组 题目:陌上花开(此题目前找不到) Pinball Game3D 3.CDQ+FFT/NTT 需要知识:①FFT②NTT 题目:HDU 5730 Shell N…

UVA - 1349 Optimal Bus Route Design Time Limit: 3000MS Memory Limit: Unknown 64bit IO Format: %lld & %llu Description A big city wants to improve its bus transportation system. One of the improvement is to add scenic routes which go es through attrac…

题目链接:http://acm.hust.edu.cn/vjudge/contest/view.action?cid=82842#problem/D In a city there are n bus drivers. Also there are n morning bus routes & n afternoon bus routes with various lengths. Each driver is assigned one morning route & one evenin…

A. Serval and Bus time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output It is raining heavily. But this is the first day for Serval, who just became 3 years old, to go to the kindergarten. Unfort…

Z - Bus Routes Time Limit:1000MS     Memory Limit:65536KB     64bit IO Format:%I64d & %I64u Submit Status Practice URAL 1137 Description Several bus routes were in the city of Fishburg. None of the routes shared the same section of road, though commo…

Problem Description Acesrc is a famous tourist at Nanjing University second to none. During this summer holiday, he, along with Zhang and Liu, is going to travel to Hong Kong. There are n spots in Hong Kong, and n−1 bidirectional sightseeing bus rout…

inputstandard inputoutputstandard outputIt is raining heavily. But this is the first day for Serval, who just became 3 years old, to go to the kindergarten. Unfortunately, he lives far from kindergarten, and his father is too busy to drive him there.…

1349 - Optimal Bus Route Design Time limit: 3.000 seconds A big city wants to improve its bus transportation system. One of the improvement is to add scenic routes which go es through attractive places. Your task is to construct a bus-route-plan for…

1434. Buses in Vasyuki Time limit: 3.0 secondMemory limit: 64 MB The Vasyuki University is holding an ACM contest. In order to help the participants make their stay in the town more comfortable, the organizers composed a scheme of Vasyuki's bus route…

UVA 11389 Time Limit:1000MS     Memory Limit:0KB     64bit IO Format:%lld & %llu Description II U C   ONLINE   C ON TEST   2 008 The Bus Driver Problem Input: standard input Output: standard output In a city there are n bus drivers. Also there are n …

  Jill Rides Again  Jill likes to ride her bicycle, but since the pretty city of Greenhills where she lives has grown, Jill often uses the excellent public bus system for part of her journey. She has a folding bicycle which she carries with her when…

Content>social media facebook, twitter, google+, instagram, pinterest (Question : How to update news ? )>bus company, client can choose bus (only malaysia singapore, thailand and indonesia got company data ?)>buying process tutorial>Easybook t…