题意:动态修改图 \(G\) 的边集,求每次修改后的 \(\sum c\times (c−1) / 2\) (记每个强连通分量中的点数量为 \(c\) ).其中修改操作共 \(m\) 次,每次最多改 \(k\) 条边.\(1≤m≤25000,1≤k≤10\),图 \(G\) 中点数为 \(n\) ,\(1≤n≤250\). 题解:\(tarjan\)由于要遍历所有边,复杂度 \(\mathcal{O}((V+E)\times m)\),在稠密图中效率较低:而使用邻接矩阵存储边集状态,利用 \(K…

Kosaraju算法,然後bitset優化 主要是學習一下自寫bitset的姿勢 #include<cstring> #include<algorithm> #include<cstdio> #include<cmath> #define rep(i,l,r) for(int i=l;i<=r;i++) #define dow(i,l,r) for(int i=r;i>=l;i--) #define rep0(i,r) for(int i=0;i…

http://acm.hdu.edu.cn/showproblem.php?pid=6072 题意: 给你$n*n$的矩阵,每次修改k条边,让你计算其中能相互到达的点对有多少. 思路: 其实就是求强连通分量,如果一个强连通分量里有n个点,那么这里面的点对就有$n*(n-1)/2$.用Kosaraju计算即可,但是这样是会超时的,还需要用bitset来优化. __builtin_函数中处理二进制位的函数: int __builtin_ffs (unsigned x) 返回x中最后一个1是从右往左第…

在shell中,内建(builtin)命令read,格式如下: read [-ers] [-a aname] [-d delim] [-i text] [-n nchars] [-N nchars] [-p prompt] [-t timeout] [-u fd] [name ...]1read命令用于从标准输入或选项”-u“指定的文件描述符中读取一行文本,把第一个单词赋值给第一个名称name,第二个单词赋值给第二个名称name,以此类推,剩余的单词连同分隔符一起赋值给最后一个名称name,如果…

BASH(1) General Commands Manual BASH(1) NAME bash - GNU Bourne-Again SHell SYNOPSIS bash [options] [command_string | file] COPYRIGHT Bash is Copyright (C) 1989-2013 by the Free Software Foundation, Inc. DESCRIPTION Bash is an sh-compatible command la…

Bash Reference Manual a.summary-letter { text-decoration: none } blockquote.indentedblock { margin-right: 0 } blockquote.smallindentedblock { margin-right: 0; font-size: smaller } blockquote.smallquotation { font-size: smaller } div.display { margin-…

Maintenance Release             Cellebrite has released a maintenance version of UFED Physical / Logical Analyzer 3.8.1.               UFED Physical / Logical Analyzer 3.8.1 Resolving issues related to: Extracting a large amount of data from the UFED…

转自:https://sysadmincasts.com/episodes/27-lvm-linear-vs-striped-logical-volumes About Episode - Duration: 16 minutes, Published: Jul 08, 2014 In this episode, I wanted to look at the performance characteristics between linear and striped logical volum…

https://db-blog.web.cern.ch/blog/luca-canali/2014-12-life-oracle-io-tracing-logical-and-physical-io-systemtap Luca Canali on 01 Dec 2014 Topic: This post is about tracing logical and physical reads in Oracle using SystemTap. You find here a few examp…

BACKGROUND The present disclosure relates generally to systems and methods for providing a data plane processing tool chain for processing packets using OSI layers 4 and above in the data plane. With the development of multi-core processors, applicat…