c stl cookbook

A recent project is to develop a framework for different product lines within the company. One problem encountered between the two is the use of the STL container, and the conclusion is that do not pass the STL container in the public interface: STL containers mentioned here, but mainly refer to containers and string classes, but they can be extended to any typ

See "STL Source Code Analysis" Today, suddenly saw a noun called __type_traits .When the container is destoy in scope, its function accepts the first and last iterators, and if all the elements in the [First,last] range call the destructor, but the destructor of this type T is irrelevant, it loses efficiency. __type_traisSTL's Destroy function prototype:Step Explanation:1. First container trigger destroy(Iterator , Iterator last)2.value_type(first) Ge

Topic 1041:simple Sorting time limit:1 seconds Memory limit:32 MB Special question: No submitted:3971 Resolution:1483 Title Description: You is given an unsorted array of integer numbers. Your task is to the sort this array and the kill possible duplicated elements occurring in it. Input: The first line of the input contains a integer number N representing the quantity of numbers in this arra

have been learning sorting algorithms, have not been in the list of lists too much effort, because not much. Recently see STL Source code, only to find that the original even the list, can also have time complexity for O (NLOGN) algorithm,Much to my surprise, I can usually think of an insertion sort.The following code is written according to the source (remove the template to increase readability), note that forward_list is the c++11 new one-way list,

Using the STL library sort function to sort vectors, the contents of a vector are pointers to objects, not objects.The code is as follows1#include 2#include 3#include 4 5 using namespacestd;6 7 classELM8 {9 Public:Ten intM_isortproof; One A Private: - int__m_ivalue; - Static int__m_icnt; the - Public: - Elm (); - intGetValue (intIX); + voidPrintelm (); - }; + A intelm::__m_icnt =0; at - Elm::el

At the beginning of the project document to see priority_queue this template, but also thought it was their own definition of it, and later checked, originally this is a priority queue in the STL.1. The simplest way to usestd::p riority_queue#include 　　2. Customizing the methodYou need to customize the operator1#include 2#include string>3#include 4#include 5 classMyresult6 {7 Public:8Myresult (std::stringWordintDistintfre)9 : M_word (Word), m_dist (D

The basic associative containers in STL have map and set, they are all based on red and black trees, and have very high efficiency of finding and deleting.Considerations for Using Map:1. The key value of the associated container is not allowed to be modified, so never attempt to modify the key value of the associative container.2, when inserting data, if you are using INSERT, and the newly inserted key value already exists in the original map, then si

Algorithm header file:#include Algorithm Introduction: The STL algorithm uses the overlay mode rather than the placement mode, so the caller must ensure that there is sufficient space for the operation. function Object Type declaration: Unaryproc:op (Elem), no return value Compfunc:op (ELEM1,ELEM2), returns TRUE or False Unarypredicate:op (Elem), returns TRUE or False Binarypredicate:op (Elem,value), returns TRUE or Fa

41-three numbers from small to large sortMemory limit: 64MB time limit: 3000ms special Judge:no accepted:31 submit:44 Title Description:Now to write a program that implements a three-digit sort of functionInput Description:Enter a three positive integerOutput Description:Sort three positive integers for inputSample input:Copy20 7 33Sample output:7 20 33Analysis:Sort directly using the sort function in the STL libraryC + + code implementation (AC):　　#i

Default (1) Template Custom (2) Template Next_permutation is a function in the The STL provides two algorithms for calculating the permutations and combinations of relationships, namely Next_permutation and prev_permutation. First we must understand what is the "next" permutation, what is the "previous" permutation combination. Consider a sequence of three characters {a,b,c}.This sequence has six possible permutat

queued in the queue, but in order of precedenceOut of the queue (the default is the big one, or you can specify your own precedence by assigning operators).The Priority_queue template class has three template parameters, the first one is the element type, the second container type, and the third is aMore operators. The latter two can be omitted, the default container is a vector, the default operator is less, that is, the small forward row, largeThe back row (the element out of the queue when t

Vectors (vector) elements for continuous storage A list is a doubly linked table of nodes, each of which contains an element A double-queue (deque) array of pointers to different elements that are stored continuously A set is a red-black tree of nodes, each of which contains an element that is arranged between nodes in a predicate that acts on the pair of elements, and that no two different elements can have the same order Multiset (Multiset) allows a collection of two elements of equal order St

First, MapSecond, go to the heavy, sort, countExample: Blue Bridge cup real problem HTTP://NEWOJ.ACMCLUB.CN/CONTESTS/1258/PROBLEM/91659:2018 Blue Bridge Cup training-STL application-day 3 Map job Title 4 title Description: Sherlock Holmes received a copy of the information from X-Star, all of which are made up of lowercase letters.His assistant provided another piece of information: A list of many passwords with a length of 8.Sherlock Holmes found tha

STL Memory pool mechanism, using a dual-level configurator. The first level uses malloc, free, and the second level uses different strategies depending on the situation. This mechanism takes space from the heap to resolve memory fragmentation issues. 1. Memory Application FlowchartThe brief flowchart is as follows. 2. Second Level configurator descriptionThe second Level Configurator is intended to solve the memory fragmentation problem caused by smal

The unique function of the class attribute algorithm is to " delete" all adjacent repeating elements from the input sequence.The algorithm removes adjacent repeating elements, rearranges the elements in the input range, and returns an iterator (the length of the container is unchanged, but the element order is changed), indicating that the range of values with no duplicates is ended.In STL, the unique function is a deduplication function, the unique f

The next_permutation and prev_permutation functions defined in C++/stl are a very flexible and efficient method that is widely used to generate different permutations for the specified sequence.The Next_permutation function generates the next larger arrangement of the given sequence in alphabetical order until the entire sequence is descending.The Prev_permutation function, in contrast, is the generation of a smaller arrangement for a given sequence.T

Set is a standard associative container in STL (Vector,list,string,deque is a sequence container, and Set,multiset,map,multimap is a standard associative container), which is implemented using a balanced search tree-red and black trees. Insert delete operation only need pointer operation node to complete, do not involve memory move and copy, so efficiency is high.Set, as the name implies, is the meaning of " set ", the elements are unique in set, and

To use the algorithms in STL, you need to introduce #include in the program header file 1. Sort the basic types of arrays from small to large:Sort (array name +n1, array name +n2);Both N1 and N2 are expressions of type int and can contain variablesIf n1=0, then + N1 can not write Sorts the elements in the array with a range of [n1,n2] from small to large. The element under subscript N2 is not within the sorting interval2. Sort from large to small for

STL Standard Template Library, which provides some data structure containers similar to Java collection classes. such as eque, list, vector, map and so on. It also provides some algorithms that support these containers and iterators that traverse the container.How to use#include #includeusing namespacestd;intMain () {//Create a vector store intvectorint>VEC; inti; //show the original size of the VECcout "Vector size ="Endl; //pushes 5 values into a ve

Operation Effect C.size () Returns the current number of elements C.empty () Determines whether the size is zero, equal to 0 = = size (), higher efficiency C.max_size () Returns the maximum number of elements that can be accommodated C1 = = C2 Determine if C1 equals C2 C1! = C2 Determine if C1 is not equal to C2 (equal to!) ( C1==C2)) C1 Determine if C1 is less t