hacker defender 完整版

《电磁场与电磁波》谢处方第4版课后习题答案（完整）

【实例简介】文件为数据库课程设计中产生的实验报告，以及汇报时制作的PPT。包括整个设备管理系统的各个阶段的内容。

saber 逆变电路仿真（含有MAST语言的PWM开关控制器）PWM单向桥式逆变电路。

LeetCode cpp最新中文题解.pdfLeetCode cpp最新中文题解.pdfLeetCode cpp最新中文题解.pdf目录3.4 Add binary615.1.5 Binary Tree Level Or-3.5 Longest Palindromic Substring. 62der traversal il3.6 Regular Expression Matching665.1.6 Binary Tree Zigzag3.7 Wildcard Matching67Level Order traversal. 963.8 Longest Common Prefix5.1.7 Recover Binary Search3. 9 Valid Number70Tree983.10 Integer to roman725. 1. 8 Same Tree3. 11 Roman to Integer735.1.9 Symmetric Tree1003.12 Count and Say745.1.10 Balanced Binary Tree.. 1023. 13 Anagrams755.1.11 Flatten Binary Tree to3. 14 Simplify Path76Linked List1033. 15 Length of Last Word775.1. 12 Populating Next RightPointers in each node ii 105第4章栈和队列7952二叉树的构建10641栈795.2.1 Construct Binary Tree4Valid Parentheses79from Preorder and In4.1.2 Longest valid Parenorder Traversa106theses805.2.2 Construct Binary Tree4.1.3 Largest Rectangle infrom Inorder and posHistogram82torder Traversal1074.1.4 Evaluate reverse pol-53二叉查找树108ish notation845.3. 1 Unique Binary Search4.2队列85Trees.1085.3.2 Unique Binary Search第5章树86Trees li.1105.1二叉树的遍历865.3.3 Validate Binary Search5.1.1 Binary Tree PreorderTreeTraversal865.3. 4 Convert Sorted array to5.1.2 Binary Tree InorderBinary Search Tree...112Traversal885.3.5 Convert Sorted List to5.1. 3 Binary Tree PostorderBinary Search Tree113Traversal9054二叉树的递归.1145. 1. 4 Binary Tree Level Or5.4.1 Minimum Depth of Bider traversal)2nary lree115目录5.4.2 Maximum Depth of Bi8.3.,2重新实现 next permunary Tree116tation1425.4.3 Path Sum11783.3递归.1435.4 4 Path Sum il118 8.4 Permutations II1445.4.5 Binary Tree Maximum8.4.1 next permutation... 144Path Suum11984.2重新实现 next permu5.4.6 Populating Next Righttation144Pointers in each node 120843递归1445.4.7 Sum Root to Leaf num8.5 Combinations146bers2185.1递归1468.5.2迭代147第6章排序1238.6 Letter Combinations of a phone6.1 Merge Sorted Array123umber1476.2 Merge Two Sorted Lists12486.1递归1486.3 Merge k Sorted Lists124862迭代96.4 Insertion Sort List125第9章广度优先搜索1506.5 Sort list1269.1 Word Ladder1506.6 First Missing Positive1279.2 Word Ladder il1546.7 Sort Colors1289.3 Surrounded regions162第7章查找94小结16413194.l适用场景1647.1 Search for a range131942思考的步骤7.2 Search Insert Position.13294.3代码模板1657. 3 Search a 2D Matrix133第10章深度优先搜索173第8章暴力枚举法13510.1 Palindrome Partitioning1738.1 Subsets13510.2 Unique Paths1768.1.1递归1350.2.1深搜1768.1.2迭代.1371022备忘录法.1768.2 Subsets il13810.23动规177821递归13810.24数学公式1788.2.2迭代.14110.3 Unique Paths Il1798. 3 Permutations14210.3.1备忘录法1798.3.1 next permutation14210.3.2动规.180目录10.4 N-Queens1813.4 Maximal rectangle21310.5 N-Queens II18413.5 Best Time to Buy and Sell Stock10.6 Restore ip addresses186.21410.7 Combination Sum18813.6 Interleaving String21510.8 Combination Sum Il18913.7 Scramble String21710.9 Generate Parentheses.19013. 8 Minimum Path Sum.22210.10 Sudoku solver19213.9 Edit Distance22410.11 Word Search.19313. 10 Decode Ways.22610.12小结19513. 11 Distinct sub22710.12.1适用场景19513. 12 Word Break22810.122思考的步骤19513 13 Word Break il2300.12.3代码模板197第14章图23210.12.4深搜与回溯法的区別.19714. 1 Clone Graph23210.12.5深搜与递归的区别..197第15章细节实现题235第11章分治法19915.1 Reverse Integer2351.1 Pow(x, n)19915.2 Palindrome Number.23611. 2 Sqrt(x)20015.3 Insert Interval237第12章贪心法20115.4 Merge Intervals23812.1 Jump game20115.5 Minimum Window Substring23912.2 Jump game II15.6 Multiply Strings24112. 3 Best Time to buy and Sell stock 20415.7 Substring with Concatenation12. 4 Best Time to buy and sell stock l205of all words24412. 5 Longest Substring Without re15.8 Pascal,s Triangle245peating Characters20615.9 Pascals Triangle Il24612.6 Container with Most Water.. 207 15.10 Spiral Matrix24715.11 Spiral matrix II248第13章动态规划20915.12 ZigZag Conversion25013. 1 Triangle20915.13 Divide Two Integers25113.2 Maximum Subarray15. 14 Text Justification25313.3 Palindrome Partitioning II1215.15 Max Points on a line255目录第1章编程技巧在判断两个浮点数a和b是否相等时,不要用a==b,应该判断二者之差的绝对值fabs(a-b)是否小于某个阈值,例如1e-9。判断一个整数是否是为奇数,用x%2!=0,不要用x%2=1,因为ⅹ可能是负用char的值作为数组下标(例如,统计字符串中每个字符岀现的次数),要考虑到char可能是负数。有的人考虑到了,先强制转型为 unsigned int再用作下标,这仍然是错的。正确的做法是,先强制转型为 unsigned char,再用作下标。这涉及C十整型提升的规则,就不详述了。以下是关于STL使用技巧的,很多条款来自《 Effective STL》这本书。vector和 string优先于动态分配的数组首先,在性能上,由于 vector能够保证连续内存,因此一旦分配了后,它的性能跟原始数组相当;其次,如果用new,意味着你要确保后面进行孓 delete,一旦忘记了,就会出现BUG,且这样需要都写一行 delete,代码不够短再次,声明多维数组的话,只能一个一个new,例如int** ary = new int*[row_num];for(int i=0: i< row num; ++1)ary [i] new int [col_num]用 vector的话一行代码搞定vectorary(row_num, vector(col_num, 0))使用 reserve来避免不必要的重新分配第2章线性表这类题目考察线性表的操作,例如,数组,单链表,双向链表等。2数组2.1.1 Remove Duplicates from Sorted array描述Given a sorted array, remove the duplicates in place such that each element appear only onceand return the new lengthDo not allocate extra space for another array, you must do this in place with constant memoryFor example, Given input array A =[1, 1, 2Your function should return length =2, and a is now [1, 2]分析无代码1/ LeetCode, Remove Duplicates from Sorted Array//时间复杂度0(n),空间复杂度0(1)class Solution tublicint removeDuplicates(vector& nums)tif (nums empty o) return 0;int index =ofor (int i =1: i nums size: 1++ iif (nums [index] ! nums [i])nums [++index]= nums [i]return index 12.1数组代码2//LeetCode, Remove Duplicates from Sorted Array/使用STL,时间复杂度0(n),空间复杂度0(1)class Solution ipublicint removeDuplicates(vector& nums)treturn distance(nums begin(), unique(nums begin(), nums end ())代码3/ LeetCode, Remove Duplicates from Sorted Array/使用STL,时间复杂度0(n),空间复杂度0(1)lass Solution fublicint removeDuplicates(vector& nums)treturn distance(nums begin(, removeDuplicates(nums begin(, nums end(), nums begintemplateOutIt removeDuplicates(InIt first, InIt last, OutIt output)thile (first last)i*output++ = *firstfirst upper_bound(first, last, *firstreturn output相关题目Remove Duplicates from Sorted Array I,见§2.1.22.1.2 Remove Duplicates from Sorted Array II描述Follow up for"Remove Duplicates " What if duplicates are allowed at most twice?For example, Given sorted array a =[1, 1, 1, 2, 2, 3]Your function should return length=5, and A is now [1, 1, 2, 2, 3分析加一个变量记录一下元素出现的次数即可。这题因为是已经排序的数组,所以一个变量即可解决。如果是没有排序的数组,则需要引入一个 hashmap来记录出现次数。4第2章线性表代码1// Leet Code, Remove Duplicates from Sorted Array II//时间复杂度0(n),空间复杂度0(1)//qauthorhex108(https://github.com/hex108)class Solution tublicint removeDuplicates(vector& nums)tif (nums size(

本人自己的毕业论文，一个信息管理系统，里面包括了开题报告、系统设计任务书、中期报告和毕业论文，内容还算比较全面，仅供参考。

PWM整流器的双闭环控制系统设计与仿真研究VoL, 46 No 5172009Electrical Measurement &InstrumentationJan.2009PWM=4CT=5ⅤSRPWMGMatlab/Simulink PowerSystem BlockⅤSR600VY/A240V500kWVSRL=0.008HR=0.0019VSR600VFig. 6 The simplified diagram of three-phase VSrT=0.001svoltage control svstem0.002skp=327;=133.3K=6T=0.025K,1+T0.5T0.75K;1+TsⅤSRT CS Ts+1v2500620………200061015001000590---------0500570上!…-1000+“++“+“=++mm==}==m=+…==b560…20000.203040.50.6070.80.925000450460470480490.50.510520530.54(a)整流器直流侧输出电压(b)整流器交流侧电压与电流曲线70600r”…0.94000.730020002上-:+--100l-0.10.350.40.450.50.550.60.650.70.15030.35040.450.50.550.60.550.70.75(c)系统无功与有功的变化曲线(d)电流跟踪电流给定值的变化曲线图7三相ⅤSR双闭环系統响应曲线Fig 7 Response curves of double closed-loop control of three phase VSR control systemC1994-2010ChinaAcademicJOurnalElectronicPublishingHouse.Allrightsreservedhttp://www.cnki.net517ol,46No.5172009Electrical measurement &InstrumentationJan.2009PWMPWM7 d2003.1062-148.Zhang Chun -Wei, Zhang Xing. PWM Rectifier and Control [M]. Bei JinChina machine press. 2003. 10: 62-1481980600vLi You-Shan.The Principle of automatic control M. Bei ing: NationalVSRDefense Industry Press. 19808,2004,21(3):30-33Ma Hui, Liu Jin-Fang, Liu Bing -Shuai. Improved triangle-wave pulsewidth modulation current control method for activc powcr filter[J]. Elcetric1000Power Automation Equipment, 2004, 21(3: 30-33.14PWM5002006.11,26(11):87-91Zhu Yong-Liang, Ma ilui, Zhang Zong-lian. Dual closed-loop control forthree -phase high -power -factor PWM rectifier J.Electric PowerAuloImal ion Equipment, 2006. 11, 26(11): 87-91[5Ye Y, Kazerani M, Quintana V HA novel modeling and method for100three-phase PWM converters PESC 2001 IEEE 32 Annual 2001, 1: 10215001070310320330340350.360.370.380.3904041图8逆变状态下交流侧电压与电流波形19858138-181.Wei Ze-Guo. The principle and application of the silicon control cascadeFig 8 The curves of the VSR voltage control system inM]. BeiJing: Metallurgy Industry Press, 1985.8: 138-181Inversion stateoEmail:luckdd(@163.comi1950-PWM1974PW8-0905MEASUREMENT AND CONTROL TECHNOLOGY, 2006. ( 3): 28-30ⅤXIVISA00.1991:4548Wang Hou-jun, Tian Shu-lin. Chen Guang- ju Lu Ming. Dc sign of VIsAI/Yang Guo-yhong, Zhou Hony, Y Feny, Wany Ie -yu. Eveils Handlling O Library of Fmbedtled VXI Comlrllers [J]. MEASUREMENT AD)Mcchanism Implementation of VISA J]. MEASUREMENT ANDCONTROL TECHNOLOGY, 2001, 2009): 19-22CONTROL TECHNOLOGY, 2000, 19(9): 45-48USB-GPIB(1958-)2004[6USB-GPIBVISAEmail watyxw aillueledileu,2006,43(1150-531984-WANG Xue-wei ZHANG Wei-wei Developmenl of the VISA FunclionE mail longyangxia@a 126:0ILib for USB-GPIB Controller and its Visual C++ Application J]ELECTRICAL MEASUREMENT INSTRUMENTATION, 2006,(Il)2008-10-0651-5376C1994-2010ChinaAcademicJournalElectronicPublishingHouse.Allrightsreservedhttp://www.cnki.net

【实例简介】html网页添加注册与登陆代码实现登录注册的数据库连接和简单的登录注册设计

可以把固件加密后通过IAP下载，适合产品自动升级，保护固件程序，防破解。记得评分后归还积分

OFDMA系统资源分配算法的研究，这篇论文可以结合《ofdma 系统中的各种资源分配算法仿真.zip》的代码进行学习

本文重点介绍了，Matlab优化工具在通用风力机翼型型线设计中的应用情况。并进行了设计实例分析第28卷第4期机械设计Vol 28 No 42011年4月JOURNAL OF MACHINE DESIGNApr.2011种有效的动压气体径向轴承承载力数值解法张海军,沈剑英,杨琴(嘉兴学院机电工程学院,浙江嘉兴314001)摘要:考虑动压气体径向轴承中气膜压力变化小的特点,对润滑 Reynolds方程的非线性项进行适当近似,得到线性Reymolds方程。利用有限差分法求解该近似 Reynolds方程,得到动压气体径向轴承的压力分布,分析气体径向轴承性能,计算得出轴承承栽力的大小,并与文献中的实验数据进行比较。与直接数值解相比,该数值解计算结果与实验数据吻合较好。关键词:动压气体径向轴承; Reynolds方程;非线性;有服差分法;中图分类号:TH17.2文獻标识码:A文章编号:1001-2354(2011)04-002-04气体轴承利用润滑膜中的气体压力来实现承载作为两类3:解析数值解和直接数值解。解析数值解方用的。由于所用润滑介质一般为空气,因此气体轴承法,即对非线性 Reynolds方程进行一些近似,求得近似具有摩擦损耗少、速度高、精度高和污染少等特点1。解析解表达式,然后用数值方法求解;直接数值解方法20世纪60~70年代国内外进行气体轴承研究较多,则是对非线性 Reynolds方程直接进行数值近似求解。近年来随着MEMS微动力涡轮研究的兴起,气体轴承 Raimondi利用有限差分法分析了有限长动压气体径的研究又开始受到重视2]。向轴承性能。Peks和 Breuer5采用伪谱法来求解Reynolds方程是分析动压气体径向轴承性能的基 Reynolds方程。戚社苗。等通过数学变换,将动压气本方程,由于气体的可压缩性使 Reynolds方程呈现非体润滑 Reynolds方程变换成标准的椭圆型偏微分方程线性,一般难以求得解析解,因此采用数值方法研究气形式,以 Matlab pde( partial differential equation)工具体径向轴承性能是一种有效途径。数值解方法可以分箱为求解器,实现 Reynolds方程的计算。如·.·············分··心···分·····如·心如·鲁心·心心普·心···心·必·心·心·心·心·心·心鲁●[2 Fuglsang P, Bak C, Gaunaa M, et al. Design and verificaApplication Matlab optimization tool in general profilestion of the Risg- Bl airfoil family for wind turbine[ J]. Jour- design for wind turbine airfoilsnal of Solar Energy Engineering, 2004, 126: 1002-1010WANG Xu-dong WANG Li-cun[3] Timmer W A, Van Rooi A. Summary of the delft universiEngineering Research Centre for Waste Oil Recovery Tech-ty wind turbine dedicated airfoils[ J]. Jourmal of Solar En- nology and equipment, Ministry of Education, Chongqing Technolergy Engineering, 2003, 125: 488-496ogy and Business University, Chongqing 400067, China[4] Bjork A. Coordinates and calculations for the FFA-Wl-xxxAbstract: Based on the optimization algorithm and optimizaFFA-W2-xox and FFA-w3-xxx series of airfoils for horizon- tion tool in Matlab, the optimization mathematical model for the In-tal axis wind turbines[ R ] FFA TN, Stockholm, tegrated expression of general profile for wind turbine airfoils wasSweden, 1990established. By taking the optimization design of the lift and drag[5]苏金明,张莲花,刘波等.MA们AB工具箱应用M]. ratio of wind turbine airfoils as the objective function, taking the co-北京:电子工业出版社,2004.eficients of the general profile control equation as design variables6]钱翼稷.空气动力学[M].北京:北京航空航天大学出 and taking the thickness and curve shape of the wind turbines air-版社,2005foils as the constraints, one airfoil with relative thickness of 18%is[7]王旭东,陈进, Wenzhong Shen,等.风力机叶片翼型型线 designed and the its performances are analyzed. The result has集成设计理论研究[门].中国机械工程,2009,20(2): broadened the design way and method for wind turbine airfoils211-213Key words Matlab; wind turbine airfoil; general profile; op-[8] Drela M. XFOIL 6.8 User Primer[M]. MIT Aero astro, timization algorithmFig 3 Tab0 Ref 8Jixie Sheji"0298咖收稿日期:2010-01-11;修订日期:2010-10-25甚金项目:嘉兴市科技计划资助项目(2008AY2021)作者简介:张海军(1976—),男,山东鱼台人,讲师,硕士,研究方向:气体轴承-转子动力学等。Mat1ab优化工具在通用风力机翼型型线设计中的应用旧WANFANG DATA文献链接作者:王旭东,王立存, WANG Xu-dong, WANG LI-cun作者单位:重庆工商大学,废油资源化技术与装备教育部工程研究中心,重庆,400067刊名:机械设计 ISTIC PKU英文刊名:JOURNAL OF MACHINE DESIGN年,卷(期)本文链接http://d.g.wanfangdata.comcn/periodiCaljxsj201104005.aspx