$2016$长城信息杯中国大学生程序设计竞赛中南邀请赛$C$题 简单题. 注意题目中给出的数据范围:$1 \le ai < bi \le n$,说明这是一个有向无环图,并且哈密顿路一定是$1 \to 2 \to 3 \to  \cdots  \cdots  \to n$. 因此这题就很简单了.哎,明明知道这原本是一个$NP$问题,但在比赛的时候还在不停的想怎么做,没有考虑到数据给出了这样的范围.....真是菜.最后还是机智的队友发现了. #pragma comment(linker, "/…

湘潭邀请赛的C题,哈密顿路径,边为有向且给定的所有边起点小于终点,怎么感觉是脑筋急转弯? 以后一定要牢记思维活跃一点,把复杂的事情尽量简单化而不是简单的事情复杂化. #include<cstdio> #include<iostream> #include<cstdlib> #include<cstring> #include<string> #include<algorithm> #include<map> #includ…

升级时碰见的异常 private void installPackage(String appName,final File apk) { if (!apk.exists()) { setHasNewVersion(appName,false); hideProgressDialog(); return; } apk.setReadable(true, false); apk.setExecutable(true, false); //走完installPackage之后就结束了,回调obser…

http://www.cnblogs.com/jiel/p/5852591.html 众所周知求一个图的哈密顿回路是一个NPC问题: In the mathematical field of graph theory, a Hamiltonian path (or traceable path) is a path in an undirected or directed graph that visits each vertex exactly once. A Hamiltonian cycl…

题目链接: E. Points on Plane time limit per test 2 seconds memory limit per test 256 megabytes input standard input output standard output On a plane are n points (xi, yi) with integer coordinates between 0 and 106. The distance between the two points wi…

C. Points on Plane Time Limit: 1 Sec Memory Limit: 256 MB 题目连接 http://codeforces.com/contest/576/problem/C Description On a plane are n points (xi, yi) with integer coordinates between 0 and 106. The distance between the two points with numbers a and…

Problem Description   As we know, Rikka is poor at math. Yuta is worrying about this situation, so he gives Rikka some math tasks to practice. There is one of them: Yuta has a non-direct graph with n vertices and n edges. Now he wants you to tell him…

将COMP20003中关于Graph的内容进行总结,内容来自COMP20003,中文术语并不准确,以英文为准. Graph G = {V, E} 顶Vertices V: can contain information 边Edges E (links between vertices): can have direction and/or weight 种类: 有向图(directed graph):边(edge)有方向. 弱有向连接图Weakly connected directed grap…

This is a list of some of the more commonly known problems that are NP-complete when expressed as decision problems. As there are hundreds of such problems known, this list is in no way comprehensive. Many problems of this type can be found in Garey…

NP问题(Non-deterministic Polynomial ):多项式复杂程度的非确定性问题,这些问题无法根据公式直接地计算出来.比如,找大质数的问题(有没有一个公式,你一套公式,就可以一步步推算出来,下一个质数应该是多少呢?这样的公式是没有的):再比如,大的合数分解质因数的问题(有没有一个公式,把合数代进去,就直接可以算出,它的因子各自是多少?也没有这样的公式). NPC问题(Non-deterministic Polynomial complete):NP完全问题,可以这么认为,这种…