vjudge \(Description\) 给定一张\(n\)个点\(m\)条边的无向图,每个点有一个权值.求一条从\(1\)到\(n\)的路径,使得代价最小,输出最小代价. 一条路径的代价定义为,路径上所有点以及和这些点相邻的所有点的权值和. \(n\leq40,\ m\leq\frac{n(n-1)}{2}\). \(Solution\) 容易发现,如果选择从\(u\)走到\(v\),那么一定不会再回到\(u\)的其它相邻节点(不如直接走过去). 这样从点\(u\)爆搜的话,每次移动都会删…

直接爆搜的复杂度是2^n,对于n<=40的数据过不了. 考虑优化一下. 发现如果走了一个点后,以后是不可能再经过与它相邻的点的,因为这样走显然不如直接走那个与它相邻的点. 这样每走一步就可以删掉d[x]个点,d[x]为x的度数. 这样做的复杂度O(n)=k*O(n-k) 在k=3的时候取到最大是,约等于3^13,可以通过. #include<bits/stdc++.h> #define N 110000 #define L 100000 #define eps 1e-7 #define…

B. Marathon time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Valera takes part in the Berland Marathon. The marathon race starts at the stadium that can be represented on the plane as a squa…

Marathon Time Limit: 1000MS   Memory Limit: 262144KB   64bit IO Format: %I64d & %I64u Submit Status Description Valera takes part in the Berland Marathon. The marathon race starts at the stadium that can be represented on the plane as a square whose…

链接:http://codeforces.com/contest/404/problem/B B. Marathon time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Valera takes part in the Berland Marathon. The marathon race starts at the stadium…

链接 A. Valera and X time limit per test:1 secondmemory limit per test:256 megabytesinput:standard inputoutput:standard output Valera is a little boy. Yesterday he got a huge Math hometask at school, so Valera didn't have enough time to properly learn…

Open source software has become a fundamental building block for some of the biggest websites. And as those websites have grown, best practices and guiding principles around their architectures have emerged. This chapter seeks to cover some of the ke…

转自:http://aosabook.org/en/distsys.html Scalable Web Architecture and Distributed Systems Kate Matsudaira Open source software has become a fundamental building block for someof the biggest websites. And as those websites have grown,best practices and…

marathon 1.6.322 官方:https://mesosphere.github.io/marathon/ 一 简介 Marathon is a production-grade container orchestration platform for Mesosphere’s Datacenter Operating System (DC/OS) and Apache Mesos.\ marathon是一个DC/OS和mesos上的容器编排平台: Features High Avai…

Meandering Through the Maze of MFC Message and Command Routing Paul DiLascia Paul DiLascia is a freelance software consultant specializing in developing C++ applications for Windows. He is the author of Windows++: Writing Reusable Code in C++ (Addiso…