[CF575B]Bribes 题目大意: 一棵\(n(n\le10^5)\)个结点的树,有些边有方向,对于每条边,如果第\(i\)次逆向走过这条边,就会产生\(2^{i-1}\)的代价.开始在\(1\)号点,依次经过给出的\(m(m\le10^6)\)个点,求总代价最小值. 思路: 维护树上差分即可. 源代码: #include<cstdio> #include<cctype> #include<vector> inline int getint() { registe…

题意: 给定一棵n个点和有向边构成的树,其中一些边是合法边,一些边是非法边, 经过非法边需要1的费用,并且经过之后费用翻倍. 给定一个长为m的序列,问从点1开始按顺序移动到序列中对应点的总费用. 1<=n<=10^5, 1<=m<=10^6 题解: 还是比较水的… 正解是各种方法求LCA,在点上打标记,最后DFS一遍就可以得到答案. 用tarjan求LCA可以做到总复杂度O(n*α)… 我傻傻地见树就剖,强行O(n log n log n)碾过去了… 每次把起点终点之间的路径的经过…

题目链接: http://codeforces.com/contest/575/problem/B 题解: 把链u,v拆成u,lca(u,v)和v,lca(u,v)(v,lca(u,v)是倒过来的).这样就只要考虑自下而上的线性结构了,可以用前缀和的思想来做成段更新. 代码: #include<cstdio> #include<vector> #include<cstring> #include<iostream> #include<algorithm…

K. King's Rout time limit per test 4 seconds memory limit per test 512 megabytes input standard input output standard output The great rout will be held this evening in the palace of his majesty Nassah II, the king of Occorom. There are n guests invi…

Season 1, Episode 16 -Burrows:Don't be. It's not your fault. 不要,不是你的错 -Fernando: Know what I like? 知道我喜欢什么? -Maricruz: Hmm? 恩 -Fernando: How after we make love... 我们做完以后 you get this little puddle of water in your belly button. puddle: 水坑  belly: 腹部,…

第5章 运算符,表达式和语句 5.1 循环简单 程序清单 5.1 显示了一个示例程序,该程序做了一点算术运算来计算穿 9 码鞋的脚用英寸表示的长度.为了增加你对循环的理解,程序的第一版演示了不使用循环编程的局限性. 程序清单 5.2 shoes2.c 程序---------------------------------------------------------------------/* shoes2.c ---- 计算多个鞋尺码对应的英寸长度 */ #include <stdio.h>…

Problem In a kingdom there are prison cells (numbered 1 to P) built to form a straight line segment. Cells number i and i+1 are adjacent, and prisoners in adjacent cells are called "neighbours." A wall with a window separates adjacent cells, and…

windows下perl开发环境搭建 perl下载地址:http://www.activestate.com/developer-tools 各个插件的安装方法:(通过代理上网的方法) 方法一:padwalker的安装步骤 1. padwalker下载地址: http://www.bribes.org/perl/ppm/ padwalker2. 解压下载的文件 4. 拷贝 blib/lib/PadWalker.pm 到 Perl/lib(你的安装路径)5. 拷贝 blib/arch/auto/P…

1. A manufacturing project has a schedule performance index (SPI) of 0.89 and a cost performance index (CPI) of 0.91. Generally, what is the BEST explanation for why this occurred? A. The scope was changed. B. A supplier went out of business and a ne…

With considerable fanfare, China's anti-graft squad has rolled out a brand new website in the ongoing fight against corruption. anti-graft:反腐 tale:故事,传说,叙述 fanfare:炫耀 roll out:铺开,推出 Billed as a new channel for the public to report corruption - whethe…