frog vector

Today, I have nothing to do with it. I 've been reading about it for a long time on my computer. When I saw 43rd entries, I found that, as mentioned above, the algorithm replaces the manual loop. No doubt arises. I remember the operator [] operation (subscript operation) was the most efficient loop when I read the vector source code ). The algorithm is fast. The following is a test code: // Test class and call Function Class AAA{Public:Void MakeFul

C ++ Study Notes (15th): How the vector object grows in the memory space, learning notes vector How does a vector object increase in memory? We all know that vector objects are dynamically stored. From this point of view, they are a bit like linked lists, which can dynamically increase or decrease elements. We also kn

Vector series in practice c ++ -- use std: find and std: find_if algorithms for vector (custom class) Previously, my blog talked about some usage of std: find and std: find _ if, but not about the custom class stored in the vector. How to Use std:: find and std: find_if? First define a class: class Item{private: std::string m_ItemId; int m_Price; int m_

In practice, the vector series in c ++ -- Some vector exceptions Today, we will write some vector exceptions that can be captured. Out_of_rangeThe array is out of bounds. The vector automatically increases the capacity, but if the index exceeds the current size, an exception is thrown. # Include # Include

public class Operatevector { /* * * * * */ public Vector Buildvector () { vector vtemps = new vector (); for (int i=0;i vector vtemp = new vector (); for (int j=0;j vtemp.addelement ("Vector (" +i+ ") (" +j+ ")"); 　　 } vte

Vector or arraylist-which one is better? Why? The answer to this question cannot be generalized. Sometimes it is better to use vector. Sometimes it is an arraylist. Sometimes neither of them is The best choice. Don't expect a simple affirmative answer, because it depends on what you use them. Four of the following are to be considered: Factors: L API L synchronous processing L data growth L usage mode We wi

As in the title, if I were to answer before, I would say, yes, in the multi-threaded environment to operate the vector, do not need to add synchronized.But I accidentally saw an article today, I found that my previous idea was wrong, the address of this article:http://zhangbq168.blog.163.com/blog/static/2373530520082332459511/I extract the key part:Vectors are slower than ArrayList because the vectors themselves are synchronized, and ArrayList is notT

Label: style blog HTTP color OS Io ar Div html When setting the CPU parameters during the learning process of the nioshi II, the Reset vector and exception vector settings are encountered. Shows the parameter setting screen. Reset vector -- Reset vectorException vector -- execution VectorFirst, it indicates that both

Android5.0 vector animation-[initial recognition of Vector Graphics SVG and VectorDrawable], Android5.0 + advanced animation Development describes how to use VectorDrawable technology, besell curve technology, and PathMeasure technology to achieve cool animation. What are the points worth learning about Frame Animation, intercept animation, and attribute animation compared to the previously learned frame an

mentioned. This is the function interval. Description :A: Taking two-dimensional space as an example, the linear equation is changed to +c=0 ax+by+c=0. The usage vector w instead (A, b) is represented by the feature vector x, which is the formula.B: For the straight line we learned. By substituting the negative instance point (0,0), we can see that the calculated result +1 is inconsistent with

STD: Difference Between Reserve and resize of Vector1. Reserve: Allocate space, change capacity but not size2.Resize: Allocate space. Changing the capacity also changes the size. If you know the vector size, resize it as an array without allocating extra memory. ReserveIt is a container reserved space, but does not actually create element objects. Before creating an object, you cannot reference the elements in the container. Therefore, when add

There is a copy function in the STL algorithm. We can easily write this code:#include #include #include using namespace STD;int_tmain (intARGC, _tchar* argv[]) {Doubledarray[Ten]={1.0,1.1,1.2,1.3,1.4,1.5,1.6,1.7,1.8,1.9}; vectordouble>Vdouble (Ten); vectordouble>:: Iterator Outputiterator=vdouble.begin (); Copy (darray,darray+Ten, Outputiterator); while(Outputiterator!=vdouble.end ()) {coutreturn 0;}So you want to use copy to set the to vector, so you

Recently want to learn the next Lucene, the previous run of the demo will feel very magical, what principle, especially to find the highest similarity, the best results. Simply jump directly to this question, a lot of data are mentioned in the VSM (vector space model) is a vector spatial models, according to this model can be the search results of the optimization of the screening, and currently do not know

Vector series in practice c ++ -- using vector to construct two-dimensional arrays 2D arrays are sometimes used, but few use vector to construct a 2D array. First of all, it should be clear that there is no two-dimensional array in the computer world, just a concept of the user. In fact, our so-called two-dimensional array must also be a continuous memory. In

Dynamically assigned vector pointer Vector If it is a dynamically allocated vector pointer, you can only use the array method (the above Code is red) when inserting elements into the vector. the push_back () function has an error. Why? Use the shared_ptr vector point

C ++ learning notes (16): perform more operations on vector-generic algorithms and learning notes vector Emphasize that the generic algorithm here is not only for vector operations, but for "sequential containers. But what is an ordered container: We all know that containers are collections of certain types of objects. Ordered containers provide programmers with

The Int size is 4, and the vector # Include Output result: 201 ...... 20100 press any key to continue... We can see that:Sizeof (VEC) depends only on the Data Type stored in the vector and has nothing to do with the number of elements. This value should be related to the compiler. # Include Output: Sizeof (vector Why is the size 20, and so

Previously, the Insert () method for vectors was used to insert the elements of vector b into vector a. We can imagine the results in vector a, but what about the elements in vector b?Look at the program that you've written before:#include #include intMain () {STD:: vectorint>Myvector (3, -);STD:: vectorint>:: Iterator

Previous blogs have written about vectors using the sort algorithm, and vector some of the processing methods that have been written before.Just write it today vector . Sort by using the sort algorithm.#include #include #include #include #include BOOLCompare_int (intAMP;LHS,int RHS) {returnLHS > RHS;}BOOLCompare_first_letter (Const STD::unique_ptrSTD::string> AMP;LHS,Const STD::unique_ptrSTD::string> RHS)

The arraylist, inclulist, and vestor classes all implement the java. util. List interface, but they have different features, mainly as follows: I,Synchronization Arraylist and inclulist are not synchronized, while vestor is. Therefore, if thread security is required, arraylist or javaslist can be used to save costs for synchronization. But in the case of multithreading, sometimes we have to use vector. Of course, you can also package arraylist and his