spa vector

The data structure we implement is to solve the dynamic open-up space usage during the running process (for example, we do not know how much we enter without stopping the input) Two principles: I. Stupid Methods How much space is used and how much space is opened for the first time? The second time we use space, we will open up space B larger than the first one, copy the data in A to B, then release a, and write new data in C. Disadvantage: copying is too many times and the efficiency is lo

Establishing equationsSet a to a point outside the line,B,c to two points in a straight line$\left\{\begin{matrix}(X-ax,y-ay) \cdot (cx-bx,cy-by) =0 \\FRAC{Y-CY}{X-CX}=\FRAC{Y-BY}{X-BX} \\end{matrix} \right.$?Solve the symbolic solutionUsing the Mathematics tool: solve[{(x?-? Ax) * (CX?-? bx)? +? ( Y?-? ay) * (Cy?-? by)? = =??? ??? 0,? (y?-? Cy) * (x?-? bx)? = =? (y?-? by) * (x?-? cx)},? {x,?y}]?? Come to the following: {{x?->?-(bx?-? cx)? ( Ax?bx?+?ay?by?-? ax?cx?-? a

For example, I have a piece of code as follows: Class cls_vector_item There is no problem with this code. When VCT. push_back (CVI);, when the internal space of VCT is insufficient, a new space will be applied and the object will be removed! However, note that this object should have been removed, but the internal object of the object we are currently in will be removed, but it will become garbage, that is, when the VCT applies for space, the old space is destructed, but our objects are st

Combine part of a label vector and accumulate it into a full vector

Int main () {vector

C + + STL provides a very powerful sorting function sort, which can sort any array, struct, and class, let's take a look at the simplest array sort. The default ascending order, we can also add less or greater to tell the compiler what sort order we want.vectorint> v = {2015927}; // Ascending order sort (V.begin (), V.end ()), Sort (V.begin (), V.end (),less int>()); // descending order sort (V.rbegin (), V.rend ()), Sort (V.begin (), v.end (), Greaterint> ());If it's a two-dimensional array, or

vector Container Vectors are a collection of objects of the same type, each with a corresponding integer index value. As with string objects, the standard library is responsible for managing the associated memory of the storage element. We refer to the vector as a container because it can contain other objects. All objects in a container must be of the same type. Before using vectors, you must include the

Vectors are the standard tool for 2D and 3D Mathematical research, and in 3D games vectors are the basis. Therefore, it is very important to master some basic concepts and properties of vectors and common operation methods. In this blog, horse and everyone to review and learn about the Unity3d in the common 3D mathematics knowledge.I. Vector concepts and basic definitions 1, mathematical definitions of vectors A

Part 1th Vector IntroductionVectors are vector queues, which are classes added by the JDK1.0 version. Inherits from Abstractlist, implements the list, randomaccess, cloneable these interfaces.Vector inherits the Abstractlist and realizes the list; therefore, it is a queue, supporting the relevant add, delete, modify, traverse and other functions.Vector implements the Randmoaccess interface, which provides a

For the first time, I said a little bit. The basic content of vector knowledge and a bit of usage skills, the simple display of its role in game programming. This time, take full advantage of the nature of the vector to imitate a physical phenomenon. First, I would like to introduce the two basic but very important techniques that will be used.One, the vector b o

this time we go on to look at the Java data structure vectors (vector) Stack (stack). The first is the vector, vectors (vector) classes are very similar to the traditional array, but the size of the vector can be changed dynamically according to the need. As arrays, the elements of a

This article on the introduction of STL vector usage is very detailed, please see below Introduced The purpose of this article is to introduce std::vector, how to properly use their member functions, and so on. The use of conditional functions and function pointers in iterative algorithms, such as in Remove_if () and For_each (), is also discussed in this paper. By reading this article readers should be a

Starting with 5.0 (API level 21), Android is starting to support vector graphics. What is the vector map and the vector map has any advantages and disadvantages is not covered in this article, the specific reference vector map encyclopedia. But here's the advantage: Holds the least information, the file size is smalle

Document directory 1. carray 2.: STD: vector 3.: type definition in STD: vector 4.: STD: vector 5. Access elements in the vector 6.: STD: vector 7. add elements to the vector 8. Delete Elements 9. Access elements

concept will be elaborated. The main purpose of the blog is to make notes for themselves to remind.All right, it's officially started.Vector, Chinese is the "vector", how difficult to understand the name, vectors is clearly the concept of geometry, okay? Before the vector or foggy, listen to the students bragging about using vectors to do the storage, really worship a, in fact, this thing is an array of pl

Use of vector in C ++ Vector is the most common container in STL. It is an ordered container that supports random access. Simply put, vector is a dynamic array that can store any type of data, but the array is a static allocation space. Once the space is allocated, the size cannot be changed, but the vector is dynamica

Use of Vector The underlying Array Structure of the vector class, which contains components that can be accessed using integer indexes. However, the vector size can be increased or reduced as needed to meet the needs of adding or removing items after the vector is created. Therefore, you do not need to consider whether

1) Quantity: Also called scalar, pure quantity, only the size has no direction, can use a numerical value to determine;2) Vector: Also known as vector, describing this kind of quantity not only needs the size, but also needs to express its direction;3) directed segment: a segment with a certain length and a definite direction;4) geometric vector: short

Document directory Basic Requirements Create a vector instance Preset vector Length Create a vector with dynamically Adjustable Length Add a value to a vector object Use Vector Programming OneArray)It is like a container that organizes a set of variables together. A s

Vector Common Methods assign () assigning values to elements in vectors void assign (Input_iterator start, Input_iterator end); //void assign (Size_type num, const type VAL); Reserve () sets the vector smallest element to hold the quantity function to reserve a space for at least a size element for the current vector. (The actual space may be greater than size) R