HDU6331 Problem M. Walking Plan 题意: 给出一张有\(N\)个点的有向图,有\(q\)次询问,每次询问从\(s\)到\(t\)且最少走\(k\)条边的最短路径是多少 \(N\le 50, q\le 10^5, k\le 10^4\) 题解: 如果暴力预处理的话复杂度是\(kN^3\)也就是\(1.25\times 10^9\),空间上肯定开不起 第二个想法就是对邻接矩阵进行矩阵快速幂,对于每次询问都要跑一次,复杂度是\(qN^3\log k\)复杂度更高了 考虑分…

传送门 题目大意 给你一个n点m条边的有向图,q次询问,给定s,t,k,求由s到t至少经过k条边的最短路. 分析 我们设dp[i][j][k]为从i到j至少经过k条边的最短路,sp[i][j]意为从i到j只经过一条边的最短路,于是我们可以得到转移方程式:dp[i][k]=Min{dp[i][m][k-1]+sp[m][j]}.但是我们发现这个样复杂度并不行,于是我们考虑分块,定每一个块的大小为100,对于小于等于100的所有k我们使用上面的dp式子暴力预处理,在这之后我们将按以上方式求出的k=1…

题目链接 Problem Description There are $$$n$$$ intersections in Bytetown, connected with $$$m$$$ one way streets. Little $$$Q$$$ likes sport walking very much, he plans to walk for q days. On the $$$i$$$-th day, Little $$$Q$$$ plans to start walking at t…

链接:http://acm.hdu.edu.cn/showproblem.php?pid=6331 Walking Plan  Problem Description There are n intersections in Bytetown, connected with m one way streets. Little Q likes sport walking very much, he plans to walk for q days. On the i -th day, Little…

传送门 分块floyd $f[i][j][k]$表示从i走k步到j的最短路 $g[i][j][k]$表示从i走k*100步到j的最短路 $h[i][j][k]$表示从i至少走k步到j的最短路 询问从x到y至少走z步的最短路时,因为至多多走n步,用上面预处理的f,g,h可以得出答案. //Achen #include<algorithm> #include<iostream> #include<cstring> #include<cstdlib> #inclu…

题目链接 hdu6331 自我吐槽,这场多校大失败,开局签到因输入输出格式写错,wa了3发.队友C题wa了1个小时,还硬说自己写的没错,结果我随便造了个小数据,他都没跑对.然后跑对了后又进入了无限的卡常之中,幸好最后卡过去了. G题我头铁写了个单侧凸壳,不对输入数据判重,而是在加入凸壳时判断,结果wa到比赛结束,进而导致I没时间写.M题开局看错题意直接丢了.最后从30多名掉到了150.这大概就是菜得安详吧￣ω￣= 题意 给定n个点m条有向边,q次查询,每次查询问走至少k条边的,s到t的最短路径的…

题意:给出一个有\(n\)个结点的有向图,边有边权.有\(q\)组询问,每次给出\(s,t,k\),问从\(s\)到\(t\)至少经过\(k\)条边的最短路. \(n \leq 50, \, q \leq 10^5, \, k \leq 10^4\) 首先,注意到\(n\)非常小这个性质.对于很多这类点数少,询问不易维护也不复杂的图论题,可以用矩阵来做. 我们设原图的邻接矩阵为\(G\),并定义矩阵的二元运算\(\bigotimes\)为: \[ (A \bigotimes B)_{ij} =…

题意: sol: 考虑floyed 直接暴力做的话复杂度是kn^3会炸. 考虑一个比较神仙的分块做法. 注意到我们是可以直接求单独某个k的矩阵,使用矩阵快速幂即可(取min的矩阵乘法). 单独求一次的复杂度是O(n^3logk). 设块的长度为100. 对k/100的分块边界求一下它们的矩阵. 这些矩阵称为a矩阵. 再求出前100个矩阵,这个直接floyed即可. 然后对他们搞一个后缀min,也就是说第k个矩阵代表了至少走k条边的最短路矩阵. 这些矩阵称为b矩阵. 那么回答的询问的时候设询问q=…

A - Problem A. Ascending Rating 题意:给出n个数,给出区间长度m.对于每个区间,初始值的max为0,cnt为0.遇到一个a[i] > ans, 更新ans并且cnt++.计算 $A = \sum_{i = 1}^{i = n - m +1} (max \oplus i)$ $B = \sum_{i = 1}^{i = n - m +1} (cnt \oplus i)$ 思路:单调队列,倒着扫一遍,对于每个区间的cnt就是队列的长度,扫一遍即可. #include<…

Problem D. Euler Function 思路:打表找找规律. #include<bits/stdc++.h> #define LL long long #define fi first #define se second #define mk make_pair #define pii pair<int,int> using namespace std; ; ; const int inf=0x3f3f3f3f; const LL INF=0x3f3f3f3f3f3f3…

Source: PAT A1030 Travel Plan (30 分) Description: A traveler's map gives the distances between cities along the highways, together with the cost of each highway. Now you are supposed to write a program to help a traveler to decide the shortest path b…

problem 874. Walking Robot Simulation solution1: 思路:1)如何表示移动的方向以及移动的位置坐标; 2)障碍物坐标如何检查;3)求解的是最大距离; class Solution { public: int robotSim(vector<int>& commands, vector<vector<int>>& obstacles) { unordered_set<string> obs; ])…

原文链接:http://domaintree.me/?p=1037 By Robert Thibodeau –  Starting a business can be a very daunting adventure if a proper plan is not put in place. Most entrepreneurs start up their businesses without putting adequate plans in place to succeed. No wo…

翻译:王鹏程张原 王伟策划:毛凌志2009年1月北京工业大学软件学院PS:有问题反馈至http://lexus.cnblogs.comGetting Started with SubSonicBy Scott Kuhl (http://www.geekswithblogs.net/scottkuhl)SubSonic is an open-source toolset, created by Rob Conery, as an attempt to put the funback into pr…

题解: solution Code: A. Ascending Rating #include<cstdio> const int N=10000010; int T,n,m,k,P,Q,R,MOD,i,a[N],q[N],h,t;long long A,B; int main(){ scanf("%d",&T); while(T--){ scanf("%d%d%d%d%d%d%d",&n,&m,&k,&P,&am…

2018 HDU多校第三场赛后补题 从易到难来写吧,其中题意有些直接摘了Claris的,数据范围是就不标了. 如果需要可以去hdu题库里找.题号是6319 - 6331. L. Visual Cube 题意: 在画布上画一个三维立方体. 题解: 模拟即可. 代码: #include <bits/stdc++.h> using namespace std; int a, b, c, R, C; char g[505][505]; int main () { int T; cin >>…

ACM ICPC 2010–2011, Northeastern European Regional Contest St Petersburg – Barnaul – Tashkent – Tbilisi, November 24, 2010 Problem A. Alignment of CodeProblem B. Binary OperationProblem C. Cactus RevolutionProblem D. Dome of CircusProblem E. Evacuati…

July 1st, 2018 Android Weekly Issue #316 本期内容包含教你使用Kotlin通过Annotation Processor生成代码文件, JetPack中的Android KTX, 以及升级到Target26所需要注意的东西,还包含如何使用KTX简化AndroidX里面的Slice的Build,以及如何通过MotionLayout方便实现动画的系列,还有MLKit中扫条形码的Lib介绍,以及一些譬如Kotlin MVVM, Koin依赖注入做Test, UI…

本文转载自:https://www.codeproject.com/articles/11132/walking-the-callstack Download demo project with source - 64.2 Kb Introduction In some cases you need to display the callstack of the current thread or your are just interested in the callstack of othe…

Evacuation Plan Time Limit: 1000MS   Memory Limit: 65536K Total Submissions: 4617   Accepted: 1218   Special Judge Description The City has a number of municipal buildings and a number of fallout shelters that were build specially to hide municipal w…

http://acm.timus.ru/problem.aspx?space=1&num=1982 1982. Electrification Plan Time limit: 0.5 secondMemory limit: 64 MB Some country has n cities. The government has decided to electrify all these cities. At first, power stations in k different cities…

题目链接 https://icpcarchive.ecs.baylor.edu/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=2988 problem Description Flatland government is building a new highway that will be used to transport weapons from its main weapon plan…

Secrete Master Plan Time Limit: 3000/1000 MS (Java/Others)    Memory Limit: 65535/65535 K (Java/Others)Total Submission(s): 429    Accepted Submission(s): 244 Problem Description Master Mind KongMing gave Fei Zhang a secrete master plan stashed in a…

本文转载自:https://blog.eood.cn/business-plan 假如你也有一个 idea ,但是还处于想法阶段,这个商业计划书模板能够帮你理清思路. 这个一页 BP 模板简单实用,分几个部分: 1. 问题 (Problem) 项目解决什么问题?满足什么需求? 2. 一句话介绍 (Elevator pitch) 用一句话概括问题.受众.解决方案.创新点. 3. 解决方案 (Solution) 如何解决问题,给受众带来哪些价值. 4. 目标用户 (Audience) 用户是哪个人群…

错误提示如下:(eclipse+maven) Could not calculate build plan: Failure to transfer org.apache.maven.plugins:maven-surefire-plugin:pom:2.7.1 from http://repo1.maven.org/maven2 was cached in the local repository, resolution will not be reattempted until the up…

https://code.google.com/codejam/contest/544101/dashboard#s=p0     Problem In the exciting game of Join-K, red and blue pieces are dropped into an N-by-N table. The table stands up vertically so that pieces drop down to the bottom-most empty slots in…

"I need a project plan by tomorrow morning." As project managers, that's what we hear. But we know that what the boss usually means is that s/he wants a project schedule. There is a problem though, how can you come up with a schedule without hav…

Electrification Plan Time limit: 0.5 secondMemory limit: 64 MB Some country has n cities. The government has decided to electrify all these cities. At first, power stations in k different cities were built. The other cities should be connected with t…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2426 For any school, it is hard to find a feasible accommodation plan with every student assigned to a suitable apartment while keeping everyone happy, let alone an optimal one. Recently the president of…

Problem H. Hiking in the Hills 题目连接: http://codeforces.com/gym/100531/attachments Description Helen is hiking with her friends in a highland. Their plan is to hike from their camp A to a beautiful showplace B. Unfortunately, Helen started feeling diz…