c++stl和std

C ++ STL std :: rotate()函数 (C++ STL std::rotate() function)

rotate() function is a library function of algorithm header, it is used to rotate left the elements of a sequence within a given range, it accepts the range (start, end) and a middle point, it rotates the elements in such way that the element pointed by the middle iterator becomes the new first element.

rotation()函数是算法标头的库函数，用于在给定范围内向左旋转序列的元素，接受范围(开始，结束)和中间点，以这种方式旋转元素中间迭代器指向的元素将成为新的第一个元素。

Note: To use rotate() function – include <algorithm> header or you can simple use <bits/stdc++.h> header file.

注意：要使用rotate()函数 –包括<algorithm>头文件，或者您可以简单地使用<bits / stdc ++。h>头文件。

Syntax of std::rotate() function

std :: rotate()函数的语法

std::rotate(iterator start, iterator middle, iterator end);

Parameter(s):

参数：

• iterator start – an iterator pointing to the first element of the sequence.

  迭代器开始 –指向序列第一个元素的迭代器。

• iterator middle – an iterator pointing to the middle or any other elements from where we want to start the rotation.

  中间迭代器 –指向中间或我们要开始旋转的位置的任何其他元素的迭代器。

• iterator end – an iterator pointing to the last element of the sequence.

  迭代器末端 –指向序列的最后一个元素的迭代器。

Return value: void – it returns noting.

返回值： void –返回注释。

Example:

例：

Input:    vector
    
      v{ 10, 20, 30, 40, 50 };        //rotating vector from 2nd element    rotate(v.begin(), v.begin() + 2, v.end());            Output:    30 40 50 10 20
    

C ++ STL程序演示了std :: rotate()函数的使用 (C++ STL program to demonstrate use of std::rotate() function)

In this program, we have a vector and we are rotating its elements from 2^nd index.

在此程序中，我们有一个向量，并从^第二个索引开始旋转其元素。

//C++ STL program to demonstrate use of//std::rotate() function#include 
    
     #include 
     
      #include 
      
       using namespace std;//main codeint main(){
       //vector    vector
       
         v{
    10, 20, 30, 40, 50 };    //printing vector elements    cout << "vector elements begfore rotating..." << endl;    for (int x : v)        cout << x << " ";    cout << endl;    //rotating vector from 2nd element    rotate(v.begin(), v.begin() + 2, v.end());    cout << "vector elements after rotating..." << endl;    for (int x : v)        cout << x << " ";    cout << endl;    return 0;}
       
      
     
    

Output

输出量

vector elements begfore rotating...10 20 30 40 50vector elements after rotating...30 40 50 10 20

Reference:

参考：

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c++stl和std