# toughbook 31

### Java programming: Integer range of values ( -2^31~2^31-1) analysis __ Algorithm

In Java, the minimum and maximum values for an Integer are defined as follows: /** * A constant holding the minimum value an {@code int} can * have, -2 The minimum value is -2^31, the maximum value is 2^31-1, why? The derivation process is as follows: the number of digits in the binary code that the Integer actually occupies An integer type occupies 4 bytes, one byte occupies 8 bits of binary, so an inte

### S [zero] * 31 ^ (n-1) + s [1] * 31 ^ (n-2) +. + s [n-1] Using this algorithm for hash

S [0] * 31 ^ (n-1) + s [1] * 31 ^ (n-2) +... + s [n-1] Using this algorithm hashs [0] * 31 ^ (n-1) + s [1] * 31 ^ (n-2) +... + s [n-1] How about hash using this algorithm? How to detect conflicts? When my s [0] * 31 ^ (n-1) + s [1] * 31

### s[0]*31^ (n-1) + s[1]*31^ (n-2) +. + s[n-1] Use this algorithm to do hash

s[0]*31^ (n-1) + s[1]*31^ (n-2) + ... + s[n-1] hash with this algorithm s[0]*31^ (n-1) + s[1]*31^ (n-2) + ... + s[n-1] hash with this algorithm What do you think? How to detect conflicts? When I'm a fixed-length string, say 10 characters, What is the conflict situation? It is said that this algorithm is in Ja

### Python built-in functions (31) -- id, python built-in functions 31

Python built-in functions (31) -- id, python built-in functions 31 English document: Id( Object) Return the "identity" of an object. This is an integer which is guaranteed to be unique and constant for this object during its lifetime. Two objects with non-overlapping lifetimes may have the same Id ()Value. CPython implementation detail:This is the address of the object in

### 31-language Primer -31-string substitution

= i;???????????????????????????? while (Flag?????????????? {??????????????????? Arr[flag] = arr[flag+1];??????????????????? ++flag;?????????????? }????????? }???? }The experience gained from previous questions is that the boundary is considered, and the code of the index in the subject is considered the boundary problem. The STL can be easily solved:#include #include #include using namespace Std;int main (){??? String s, s1, S2;??? while (Getline (cin,s))??? {??????? int flag;??????? S1 = "You"

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### 31. Communication between mutex lock and process, 31 mutex lock Process

31. Communication between mutex lock and process, 31 mutex lock Process We have done multi-process concurrency before, so have you found any problems. If multiple processes share the same data, for example, what will happen if you want to view and purchase a ticket at the same time on the client? Today, we will talk about process locks and inter-process communication. processes are isolated from each other

### Requirements of Baidu market on screen rate, resolution algorithm, resolution value 11, 15, 31, algorithm 31

Requirements of Baidu market on screen rate, resolution algorithm, resolution value 11, 15, 31, algorithm 31 Yesterday, I met Baidu to reject the application release because the resolution value was set to 11. I suddenly went to ask the technical department and sent an email with the following content: If you want to fully adapt models, layout and values may not be required to adapt the resolution of eac

### March 31 Study Notes (CSS part), March 31 Study Notes css

March 31 Study Notes (CSS part), March 31 Study Notes css Background attributes Text attributes The direction attribute affects the writing direction of the text in the block-level element, the direction of the column layout in the table, the direction of the element box filled with content horizontally, and the position of the last row in the alignment element at both ends. Note: For intra-row e

### [Excellent recommendation] 31 jquery modal dialogs that web developers should know [excellent recommendation] 31 jquery modal dialogs that web developers should know

, I collected 31 jquery Modal Dialog Box plug-ins. This collection covers all the modal window plug-ins. Next time you encounter such a problem, you can use it as a reference to help you create a good page. Simplemodal Simplemodal is a small plug-in for creating a modal window. It only needs a few lines.CodeYou can createMessage in the warning or confirmation dialog box.It can load content from an external page or its own page in asynchronous mo

### 31: The longest consecutive character in a string, and the longest character in a 31 string

31: The longest consecutive character in a string, and the longest character in a 31 string31: The longest consecutive character in a string View Submit Statistics Question Total time limit: 1000 ms Memory limit: 65536kB Description Returns the longest consecutive character in a string and the number of occurrences of the character. The string contains no blan

### Popular Science: Why the String hashcode method selects the number 31 as a multiplier

Https://segmentfault.com/a/1190000010799123?utm_source=tuicoolutm_medium=referral 1. Background One day, when I was writing code, I accidentally opened the String Hashcode method. Then a general look at the implementation of Hashcode, the discovery is not very complicated. But I found a strange number from the source code, that is, the protagonist of this article 31. This number is not a constant declaration, so it is impossible to infer the use of t

### SQL Server (timestamp 2018/5/31 22:07:36)

！ ' RAISERROR (@errorstr, 16,1) RETURN 101 END SELECT @EXPIREDATE = [ExpireDate] from Euser (nolock) WHERE logonname = @parame Ter1 IF @EXPIREDATE 10.SQL Service Date, time calculation timestamp 2018/5/31 14:01:53--往前/后计算日期（YY\MM\DD） SELECT CONVERT (VARCHAR(30), DATEADD(MM,-1, GETDATE()), 23) //这个 --结果2018-04-30 SELECT CONVERT(VARCHAR(10),GETDATE(),112),CONVERT(VARCHAR(10),GETDATE(),120) --结果20180521 2018-05-21 SELECT GETDATE() -

### Sqli-labs less 31

Less-31Less-31 the same way as the above two examples, we directly see the LESS-31 SQL statement:So payload is:Http://127.0.0.1:8080/sqli-labs/Less-31/index.jsp?id=1id=-2%22) Union%20select%201,user (), 3--+Summary: From the above San Guan, our main learning is different server for the different processing of parameters, HPP has a lot of applications, not only we

### Linux OPS Practice case-December 20, 2015-December 31 (first time)

Linux OPS Practice case-December 20, 2015-December 31 (first time)1. Create a 10G file system, type ext4, requires the boot can be automatically mounted to a separate data /data directory; Create a 10G partition [Email protected] ~]# FDISK/DEV/SDAWarning:dos-compatible mode is deprecated. It ' s strongly recommended toSwitch off the mode (command ' C ') and change display units toSectors (Command ' u ').Command (M for help): Nformat type is ext4 [Em

### The maximum difference of the 31 sub-arrays in the nine-chapter algorithm surface test

Nine Chapters count judges Net-original websitehttp://www.jiuzhang.com/problem/31/TopicsGiven an array, two disjoint and contiguous sub-arrays A and B (positional continuous), satisfying |sum (A)-sum (B) | maximum (and the absolute value of the difference). For example [2,-1,-2, 1,-4, 2, 8], can be obtained a=[-1,-2, 1,-4], b=[2, 8], the maximum difference is 16.AnswerThe answer is to preprocess the maximum/minimum sub-array for each position to the l

### Effective Java version--31. Using qualified wildcard characters to increase the flexibility of the API

Tips"Effective Java, third Edition" an English version has been published, the second edition of this book presumably many people have read, known as one of the four major Java books, but the second edition of 2009 published, to now nearly 8 years, but with Java 6, 7, 8, and even 9 of the release, the Java language has undergone profound changes.In the first time here translated into Chinese version. For everyone to learn to share. 31. Use qualif

### JavaSE-31 Java Regular Expressions

string to extract the phone number Reg= "((13\\d) | ( 17\\d)) \\d{8} ";//define Pattern Object pattern P=pattern.compile (reg);//Get Matcher object Matcher m=p.matcher (content);// Output phone number while (M.find ()) {System.out.println (M.group ());}　　Example 2: Use the Find () method and the Start () method, the end () method to determine the location of a specific substring in the target string.Define the target string, string content = "My phone number is 13800001234, buy Mac computer pho

### "Algorithmic Learning Notes" 31. Dynamic planning SJTU OJ 1320 Numtri

60 points, greedy strategy is decided to choose left or right, the first Test, and then according to left left right right side of the right four nodes to make decisions.PS2: This problem can also be used to conduct violent search DFS in DFS in the process of the problem can not use backtracking, because all solutions are feasible solutions, we are looking for the optimal solution, the optimal solution is generally thought to use branch boundary method to prune, but this problem node value is n

### Java Learning notes-using HttpSession to implement QQ Access Records (31)

denied the website sent back cookie information.Accessing the above case at this point causes the null pointer exception to appear. If you need to fix the site, you must use urlrewriting technology.UrlrewrittingAnalyze the reasons for the above problems:The server has created the session object, but because the browser prohibits the receipt of the cookie, the server cannot send the ID value of the created session to the browser for storage in the Set-cookie response header mode. Then in the sec

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