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Given a string S, find the longest palindromic substring in s. The maximum length of S is assume, and there exists one unique longest palindromic substring.Problem solving idea One:Brute Force enumerationTotal n^2 (starting from subscript zero), one for loop for each check, equals 3 for loop, Time complexity O (n^3)Two ways to solve problems:Dynamic planningSet a table table[][], where table[i][j] means substring (i,j+1) is not palindromic, the time complexity is O (n^2) space complexity is also

化代码，提高代码的可读性Nesting and recursion of functions·· Nesting of functions: calling other functions in one functionSolve a two-dimensional equation ax^2+bx+c=0 x=frac{-b\pm{\sqrt{b^2-4ac}}}{2a} def jieFangCheng(a,b,c):#先判断方程有没有解 if qiuJie(a,b,c):#判断qiuJie()返回的真还是假 #继续解方程求出所有的解 delta = b*b-4*a*c x1=(-b+delta**0.5)/2*a x2=(-b-delta**0.5)/2*a print x1,x2 else: print ‘无解‘ d

; redirect STDOUT and STDERR to In the same file:5. PipingPipelines represent the flow of data: When data is processed somewhere, it is piped to another place for processing. Use in Linux | As a pipe connector, represents the result of the last command's execution as input to the next command. Here are the two instance usages of the pipeline:6.set CommandSet is a built-in command in bash that can be turned on or off for some functions. For security reasons, we generally do not allow overwrite re

First, set the root user passwordsudo passwd RootSecond, install the Vim editorsudo Install Vim-noxThird, install 32-bit compatibility library　　Often encounter GCC installed, environment variable configuration, but is arm-none-eabi-gcc-v display can not find the command, in fact, in 64-bit Ubuntu is not installed 32-bit compatible libraries, resulting in 32 of ARM-NONE-EABI-GCC does not work 。sudo Install lib32ncurses5 sudo Install LIB32Z1Iv. installation of Ncurses Basic LibraryNcurses is the b

(M_editchannel1current.isempty ()) at { -MessageBox ("input current cannot be empty","Tips", mb_ok|mb_iconwarning); - return; - } - -viprintf (M_visession,"Inst:sel ch1\n");//Select Channel 1 inviprintf (M_visession,"SOURCE:OUTP:ENAB on\n");//Enable output -viprintf (M_visession,"Source:volt%sv\n", m_editchannel1voltage);//Setting the output voltage toviprintf (M_visession,"Source:curr%sa\n", m_editchannel1current);//Setting the output current +viprintf (M_visession,"SOURCE:OUTP

# sorted (iterable，Key=none,reverse=false)# keyAccepts a function that accepts only one element, and the default isNone# reverseis a Boolean value. Default isFalseIn front of the line,TrueRank in ascending order, that is, the condition of the backward row#Sort by ageStudents = [(' John ',A,15), (' Jane ',B,12), (' Dave ',B,10)]R1 =Sorted (Students,key=Lambda s:s[2]) # #String sort, collation: lowercaseCapitalOddEvens =' Asdf234gdsdsf23 'R3 ="". Join (Sorted (s,key=Lambda x: (X.isdigit ()))) #Num

The job is actually in use. Use very much. The general user periodically runs certain functions, stored procedures, and so on.Here's a look at how to create and start a job.For example, a stored procedure is run with a job schedule.Stored Procedure name: Pro_test_jobOperating interval: 2 hours,SQL statements such as the followingDeclare job number ; V_count number;begin SELECT Count (*) into v_count from user_jobs uj WHERE upper (uj.what) = UPPER (' pro_test_job; ');

Label:If you need to create a job with parameters, how to create it.We declare the parameters directly, assign them, and then pass the stored procedure to the job call.For example, the stored procedure is named Pro_test_job, and the parameters have one, which is the VARCHAR2 type.Create the job as follows:declare job number; V_count number;begin SELECT Count (*) into v_count from user_jobs uj WHERE upper (uj.what) = UPPER (' Declare para_data VARCHAR2 (100): = ' parameter ';

Label:DecDecrements the data of parameter one, and if there is a parameter two, decrements the parameterThe numerical value as described in Parameter twoIncIncrement the data of parameter one, if there is parameter two, increment the parameter oneThe numerical value as described in Parameter twoOddIf the callback parameter data is odd, if you want to test if it is an even number,Directly add a not in front to do the reverse operation can: not ODDPredThe previous value of the callback parameter d

The wait/notify mechanism is designed to avoid the performance loss caused by polling. To clarify the truth, we use the classic example of "library books" to explain. A book can only be lent to one person at a time. Now there is a book, the library

Jobs are widely used in practical applications. Generally, you can regularly execute certain functions and stored procedures. The following describes how to create and start a JOB. For example, you can use a job to regularly execute a stored

1. Back up the databaseSQL> alter database backup controlfle to trace;Default backup file storage path:E: \ oracle \ product \ 10.1.0 \ admin \ orcl \ udump2. E: \ oracle \ product \ 10.1.0 \ oradata \ orclDelete the controlfie FileError message

The basic connection has been closed and the connection is accidentally closed. I met it again. In this scenario, a field in the database table indicates the product, but the type of the product is different, that is, the attributes are different.

　　 Master• 1. Common documents in the project (the role of Info.plist and PCH files)2.uiapplicationproxy methods for 3.appdelegatethe complete start-up process of the 4.ios program (uiapplication, Appdelegate, UIWindow, uiviewcontroller

I. Concept: in computer science, divide and conquer is an important algorithm paradigm based on multiple branch recursion. The literal explanation is "divide and conquer". It refers to dividing a complicated problem into two or more identical or

Master • 1. common files in the project (info. plist And PCH files) • 2. uiapplication • 3. proxy method of appdelegate • 4. complete IOS program Startup Process (relationships between uiapplication, appdelegate, uiwindow, and uiviewcontroller) • 1.

Preface I remember a year ago, when I was looking at the design model, I was so confused. I didn't think about every concept, but I knew what the design pattern could do. Today, we can see that the [dimit principle] is inexplicable. You can call it

In fact, this is also mentioned in C ++'s basic introductory books, such as C ++ primer, but few people pay attention to it. The author puts forward this point, to remind us. The content of this clause is as follows 【Code snippet 1After being

 Maps in the game are virtual scenarios of the entire game. Generally, game maps on mobile phones can be divided into the following three types by screen scrolling: 1) Vertical scroll The most common is aircraft-hitting games, where screen

Question: Use nested conditional operators to complete this question: Students with scores> = 90 are represented by a, students with scores between 60 and 89 are represented by B, and students with scores below 60 are represented by C.