第54題：

對n個元素值分別為-1、0或1的整型數(shù)組A進行升序排序的算法描述如下：統(tǒng)計A中-1、0和1的個數(shù)，設(shè)分別為n₁、n₂和n₃，然后將A中的前n₁個元素賦值為-1，第n₁+1到n₁+n₂個元素賦值為0，最后n₃個元素賦值為1。該算法的時間復(fù)雜度和空間復(fù)雜度分別為（）。

A. A
B. B
C. C
D. D

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第55題： 設(shè)算法A的時間復(fù)雜度可用遞歸式表示，算法B的時間復(fù)雜度可用遞歸式表示，若要使得算法B漸進地快于算法A，則a的最大整數(shù)為（  ）。
 A．48
B．49
C．13
D．14
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第56題：

A類網(wǎng)絡(luò)是很大的網(wǎng)絡(luò)，每個A類網(wǎng)絡(luò)中可以有（1）個網(wǎng)絡(luò)地址。實際使用中必須把A類網(wǎng)絡(luò)劃分為子網(wǎng)，如果指定的子網(wǎng)掩碼為255.255.192.0，則該網(wǎng)絡(luò)被劃分為（2）個子網(wǎng)。

（1）
A．210
B．212
C．220
D．224
（2）
A．128
B．256
C．1024
D．2048

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第58題：

在Windows系統(tǒng)中，為排除DNS域名解析故障，需要刷新DNS解析器緩存，應(yīng)使用的命令是（）。
A．ipconfig/renew
B．ipconfig/flushdns
C．netstat-r
D．a(chǎn)rp-a

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第59題：

Extreme Programming (XP) is a discipline of software development with （1）of simplicity, communication, feedback and courage. Successful software development is a team effort-not just the development team, but the larger team consisting of customer, management and developers. XP is a simple process that brings these people together and helps them to succeed together. XP is aimed primarily at object-oriented projects using teams of a dozen or fewer programmers in one location. The principles of XP apply to any  （2）   project that needs to deliver quality software rapidly and flexibly.
An XP project needs a(an)   （3）   customer to provide guidance. Customers, programmers, managers, are all working   （4） to build the system that's needed. Customers - those who have software that needs to be developed - will learn simple, effective ways to （5）  what they need, to be sure that they are getting what they need, and to steer the project to success.
（1） A．importance
B．keys
C．roles
D．values
（2） A．small-sized
B．moderately-sized
C．large-sized
D．huge-sized
（3） A．part-time
B．casual
C．seldom
D．full-time
（4） A．together
B．by themselves 
C．separately
D．a(chǎn)lone
（5）A．tell
B．know
C．communicate 
D．feedback

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