Order statistics Select the ith smallest of n elements(the element with rank i i=l: minimum, .i=n: marimum, i=L(n+1)/2]or[(n+1)/2 median Naive algorithm: Sort and index ith element Worst-case running time =o(n Ig n)+o(1 o(nIg n using merge sort or heapsort(not quicksort) c 2001 by Charles E Leiserson

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1概述 一、IO系统组成:包括I/O设备,设备控制器及与IO操作有关的软硬件。 二、I/O系统的主要功能:对指定外设进行 I/O操作,同时完成许多其他的控制。包括:外设编址,数据通路的建立,向主机提供外设的状态信息等

chapter 9 GRAPH ALGORITHMs $I Definitions e G(V,E) where G: =graph, V=V(G): :=finite nonempty set of vertices, andE=E(G): : = finite set of edges. d' Undirected graph:(V;,vi)=(j,vi): =the same edge 6 Directed graph(digraph): :=2* I tailhead

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主要介绍I/0的控制方式和设备的分配和处理,具体包括I/0系统的硬件组成、I/O 的控制方式、缓冲技术、设备分配、 SPOOLing技术、设备驱动程序和I/0中断处理程序 磁盘存储器的管理等内容

主要介绍I/0的控制方式和设备的分配和处理,具体包括I/0系统的硬件组成、I/O 的控制方式、缓冲技术、设备分配、 SPOOLing技术、设备驱动程序和I/0中断处理程序 磁盘存储器的管理等内容

习题三解答 1沿下列路线计算积分z2d (1)自原点到3+i的直线段 (2)自原点沿实轴至3,再由3沿垂直向上至3+; (3)自原点沿虚轴至i,再由i沿水平方向右至3+i

Unit 6 I. Basic listening practice 1. Script W: Are those cigarettes yours? I thought you quit. If you go back to it, your teeth and fingers will be nicotine-Stained; your breath and clothes will smell smoky M: I didnt. I swear. Ads showing diseased lungs kept me from starting again. Believe

Uint I. Basic listening practice 1. Script W: Have you chosen your elective for next semester yet? Are you taking Frenc riting again? M: Yes I am, but it's compulsory for us next semester. So i think I'm gong to do marketing as an elective instead