acls basics

the ability to look for a string that ends with ". Scala" from a set of strings, but skips a string that begins with "-".int I=0;boolean foundit=false;while (i In Scala, you typically use the following method to implement break.1. Use a Boolean control variable.Example: Use the IF and Boolean variables below to step through the implementation using Scala (not using break and continue) as follows:var I=0var foundit=falsewhile (i 2. Use recursive functions. (Return statement is still not recommen

Clr basics (1), clr basics ( The managed code compiled by C # is managed by the Common Language Runtime (CLR). Therefore, to run C # programs, you must install the. NET Framework on your computer. To check whether the. NET Framework has been installed, check whether the mscoree. dll file exists in the system directory (C: \ Windows \ System32, if the drive C is a system disk. This file exists, indicating th

Clr basics (2): clr Basics If you have compiled a Program. cs code file, run the following command in the Visual Studio command prompt tool:Csc.exe/out: Program.exe/t: exe/r: mscorlib. dll Program. csThis command line indicates that the csung compiler generates an executable file (/out: Program.exe) named Program.exe ). The generated file belongs to the Win32 console application type (/t [target]: exe ).A h

allows the//code to compile. However, at run time, the CLR does know//What type O refers to ( each time the cast is performed) and//it checks whether the object World抯 type is an Employee or any type//That's derived from Employee.Employee e =(Employee) o; } Public Static voidPromoteEmployee2 (Object o) {if(O isEmployee) {Employee e=(Employee) o; //Use e within the remainder of the ' if ' statement. } } Public Static voidPromoteEmployee3 (Object o) {Employee e= O asEmployee; if(E! =

Ajax BASICS (1) and ajax Basics What Is Ajax? Before studying ajax, let's first discuss a question-what is Web 2.0. When you hear the word Web 2.0, you should first ask "What is Web 1.0 ?" Although few people mentioned Web 1.0, it actually refers to the traditional Web with completely different request and response models. For example, click a button on the hdu.edu.cn website. Then a request is sent to the

Java basics 11 and java basics 11 Import java. util. encode; public class Eleventh {/* returns a positive integer of no more than five digits. First, calculate the number of digits. Second, print the numbers in reverse order. (5 scores) */public static void main (String [] args) {empty input = new empty (System. in); System. out. println ("enter a positive integer of no more than five digits:"); int a = in

Java basics 10 and java Basics Import java. util. strong; public class Tenth {/* has n integers, so that the numbers in front of them are shifted to the following m positions, the last m count is the first m count */public static void main (String [] args) {variable input = new variable (System. in); System. out. println ("the number of digits you enter is:"); int a = input. nextInt (); int [] array = new

. println ("222"); test. divde (3, 4 );}} public class TestOverLoad{public static void main(String[] args){Test test = new Test();//test.print(null); Object obj = null;String str = null;StringBuffer strBuffer = null;System.out.println(obj);System.out.println(str);test.print(obj);test.print(str);test.print(strBuffer);test.print(null);} }class Test{public void print(Object some){System.out.println("Object version print"); }public void print(String some){System.out.println("String version print")

Data Structure BASICS (21), data structure basics 21DFS Start from a vertex V0, access the vertex, and then search for the traversal graph from each unaccessed adjacent vertex of V0 in sequence, until all vertices having the same path with V0 in the figure are accessed (using the stack ). // The depth of the undirected Graph stored using the adjacent matrix preferentially traverses the template BFS Sta

Data Structure BASICS (18) and data structure basics 18Hash table Based on the set hash function H (key) and the selected method for handling conflicts, a set of keywords are mapped to a finite continuous address set (interval, the keyword "image" in the address set is used as the storage location of the corresponding record in the table. In this way, the searched table constructed is called a "hash table "

Data Structure BASICS (16) and data structure basics 16Basic Terms of the tree 1. node: {Data Element + several branches pointing to the subtree} 2. node degree: number of branches (number of sub-trees) 3. Tree degree: the maximum degree of all nodes in the tree 4. leaf node: zero degree Node 5. branch nodes: nodes with a degree greater than zero (including the root and intermediate nodes) 6. (from the root

Data Structure BASICS (17), data structure basics 17 Features of binary sorting tree The binary sorting tree is either an empty tree or a binary tree with the following features: 1. Each element has a key value, which cannot be repeated; 2. If its left subtree is not empty, the values of all nodes on the left subtree are smaller than the values of the root node; 3. If its right subtree is not empty, the val

Data Structure BASICS (19) and data structure basics 19Double Rotation A single rotation problem sometimes occurs (as shown in ): (If the child node [k1] on the inner side is too deep, moving it one way will not solve the problem) So there is a double rotation. Double rotation to the right: 1. First, take k1 as the axis, and k1 and k2 rotate to the left; 2. Take k3 as the axis, and k3 and k1 after rotat

Data Structure BASICS (18) and data structure basics 18 The red/black tree is a self-balancing binary search tree and a data structure used in computer science, A typical purpose is to associate arrays (map/set in C ++ STL ). It was invented by Rudolf Bayer in 1972. It is called the symmetric Binary Tree B. Its modern name is Leo J. guibas and Robert Sedgewick obtained in a paper written in 1978. Although t

Data Structure BASICS (15) and data structure basics 15 Base sorting is an internal sorting algorithm that uses the "Multi-Keyword sorting" idea to implement "Single-Keyword sorting. There are two methods to sort multiple keywords: Ranking priority (LSD) First, sort K [0] {the smallest digit} of the base, and divide the record sequence into several subsequences based on different values of K (0, sort K [1 ,

Java Memory Model basics and java model Basics Java Memory Model: 1Thread communication: 2Re-sorting: Program EfficiencyHappens-before: If yes, it will not be reordered.Memory barrier command: deprecated sortingData Dependency: a single thread exists and will not be rearranged.As-if-serial: ensures that the rescheduling has no effect on the results of a single thread.Data competition: Correct synchronizat

Python basics 6: formatting characters, colors, and python Basics Character formatting: 1.% placeholder, % s, % d, % 2. Use format. The format is easy to use. It can be centered, %, binary, and character-filling; 1. Use Case of % Tp1 = "I am % s" % "aaa "#Tp2 = "I am % s age % d" % ("alex", 18) # sequential AssociationTp3 = "I am % (name) s age % (age) d" % {"name": "alex", "age": 18} # specify the name a

Data Structure BASICS (1): Data Structure Basics Simple implementation of Swap // C language (by-pointer): template // C ++ special method (by-reference): template Summary: Although we have implemented swap by ourselves, we recommend that you use the std: swap () function that has been implemented by C ++ STL. It is stored in the namespace std, use the following Bubble-Sort) Algorithm idea: Scan data

Data Structure BASICS (12) and data structure basics 12 Features of two-way linked list operation: (1) "query" is the same as a single-chain table; (2) When "insert" and "delete", you must modify the pointer in both directions. However, for a two-way cyclic linked list, inserting at the end of the table is very fast. It only takes O (1) time, because there is a pointer to the front, therefore, the two-way c

Data Structure BASICS (6): Data Structure Basics Stack is a linear table that only allows insert or delete operations at one end. It features: first-in-first-out (FILO)/Second-in-first-out (LIFO ); Stack VS. Queue The stack and queue are both dynamic sets, but in the stack, you can remove the recently inserted one: the stack implements a kind of "last-in, first-out) similarly, in the queue, the elements th