Tag：Situation
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Write Android 4 with kotlin – empty security, equation judgment
Air safety In kotlin, variables declared by default cannot be null, that is, if they are written in Java, they cannot be null. If the variable value is likely to be null, the type must be followed by?, Otherwise, NPE (NullPointerException) will be reported when the variable with non null value is null var name: […]
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SQL Server database repair expert sqlrescue
Focus on the recovery of SQL Server database. Focus on the repair of various blackmail virus encrypted databases. Sqlrescue can be used to recover data from corrupted MS SQL Server database data files (*. MDF *. NDF files). It can save key data and avoid its loss. 1、 The main functions of sqlrescue include: Recovery […]
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Sybase ASE database recovery tool readsybdevice
Sybase ASE database recovery tool readsybdevice: An industry-leading recovery tool that does not rely on database management system and extracts data directly from Sybase database device files! An unconventional recovery tool that can extract data from a corrupted Sybase ASE device file (. DAT). The main functions of Sybase ASE database recovery tool readsybdevice are […]
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Solution to the problem of the 11th weekly game of acwing
Calculate ABC first\(0<=a<=b<=c\)Will be given at random \(a+b,a+c,b+c,a+b+c\)Value of because\(a,b,c\)Are positive integers, so\(a+b+c\)Must be the maximumThen use\(a+b+c\)Subtract one by one (Note:\(a,b,c\)size code #include #include #include using namespace std; int x[5]; int main(){ for(int i=1;i<=4;++i) cin>>x[i]; sort(x+1,x+5); for(int i=3;i>=1;–i) cout< Square up According to the simulation of the meaning of the title, it is not difficult […]
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Playing with __ attributes__ (IV)
objc_designated_initializer usage method @interface MyObject:NSObject – (instancetype)init __attribute__((objc_designated_initializer)); @end It can also be written in IOS – (instancetype)init NS_DESIGNATED_INITIALIZER; This property specifies the initialization method of the class. Specifying the initialization method is not for the user. But to the internal reality. For example, the following situation Example explanation @interface MyObject:NSObject – (instancetype)initMyObject NS_DESIGNATED_INITIALIZER; – […]
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In depth understanding of data structure — binary tree (advanced part 1)
Series articles： In depth understanding of data structure — binary tree (advanced part 1) In depth understanding of data structure — binary tree (basic chapter) In the first part, the relative basic information of binary tree is sorted outIn depth understanding of data structure – binary tree (basic chapter) Next, we will explain the advanced […]
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Look at animation algorithms: balanced binary search tree AVL tree
brief introduction Balanced binary search tree is a special binary search tree. Why is there a balanced binary search tree? Consider the special case of binary search tree. If all nodes of a binary search tree are right nodes, the binary search tree will degenerate into a linked list. Thus, the time complexity of the […]
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JavaDoc
The Javadoc command is used to generate its own API documents parameter information @Author’s name @Version version number @Since indicates that the earliest version of JDK is required @Param parameter name @Return – return value @Throws exception thrown
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Install the cross compilation tool for Ubuntu and execute/ Arm none Linux gnueabi GCC – V command prompt: the file or directory cannot be found?
The problem is Generally, 32-bit Ubuntu is used. Generally, there will be no problem after the environment is configured. However, for 64 bit Ubuntu systems, this problem will occur after the environment is configured. In fact, there is a lack of 32-bit software package. I use Ubuntu 18 64 bit version 04.1. terms of settlement […]
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MySQL architecture and storage engine
1. MySQL architecture The architecture of MySQL can be divided into two layers: MySQL server layer and storage engine layer. MySQL server layer also includes connection layer and SQL layer, as shown in Figure 1-1. Applications connect to MySQL through interfaces (such as ODBC and JDBC). The first connection processing is the connection layer, which […]
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Exception handling of structured streaming [concurrent update to the log. Multiple streaming jobs detected]
catalogue Abnormal information I Causes of abnormal appearance 1. Exception source code: 2. Make a breakpoint II Solution 1. The start offset of each partition can be specified by code 2. Do not delete but change the batch file under checkpoint offset III Reasons behind exceptions First, what caused it? IV. verification Why is spark […]
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Uva11054 gergovia’s Wine Trading (mathematical induction)
On a straight line\(n\)There are two equidistant villages. Each village either buys or sells wine. Set the first\(i\)The demand for wine in three villages is\(A_i\)(\(-1000 \leqslant A_i \leqslant 1000\)）, where\(A_i>0\)It means buying wine,\(A_i<0\)It means selling wine. Supply and demand balance of all villages, i.e. all\(A_i\)The sum is equal to 0.hold\(k\)It takes two units of wine […]