STL_算法_逆转(reverse,reverse_copy)

Posted 2020-09-22 wzzkaifa

C++ Primer 学习中。。

。

 

简单记录下我的学习过程 (代码为主)

//全部容器适用

reverse(b,e)        //逆转区间数据

reverse_copy(b,e,b2)

/**------http://blog.csdn.net/u010579068------**/
#include<iostream>
#include<cstdio>
#include<string>
#include<vector>
#include<list>
#include<deque>
#include<algorithm>
using namespace std;

/*****************************************
//全部容器适用
reverse(b,e)        //逆转区间数据
reverse_copy(b,e,b2)
*****************************************/
/**----------------------------------------------------------------------------------
STL算法 - 变序性算法

reverse()           //逆转
reverse_copy()
rotate()            //旋转
rotate_copy()
next_permutation()
prev_permutation()
random_shuffle()
partition()
stable_partition()
----------------------------------------------------------------------------------**/
/*************************************************************************************
std::reverse                     全部排序容器适用                           algorithm
--------------------------------------------------------------------------------------
<algorithm>template <class BidirectionalIterator>
  void reverse ( BidirectionalIterator first, BidirectionalIterator last);

//eg：
template <class BidirectionalIterator>
  void reverse ( BidirectionalIterator first, BidirectionalIterator last)
{
  while ((first!=last)&&(first!=--last))
    swap (*first++,*last);
}
*************************************************************************************/

/*************************************************************************************
std::reverse_copy                   全部排序容器适用                        algorithm
--------------------------------------------------------------------------------------
template <class BidirectionalIterator, class OutputIterator>
  OutputIterator reverse_copy ( BidirectionalIterator first,
                                BidirectionalIterator last, OutputIterator result );
//eg：
template <class BidirectionalIterator, class OutputIterator>
  OutputIterator reverse_copy ( BidirectionalIterator first,
                                BidirectionalIterator last, OutputIterator result )
{
  while (first!=last) *result++ = *--last;
  return result;
}
*************************************************************************************/

int main()
{
    vector<int> myvector;
    vector<int>::iterator it;

    // set some values:
    for (int i=1; i<10; ++i) myvector.push_back(i); // 1 2 3 4 5 6 7 8 9

    reverse(myvector.begin(),myvector.end());       // 9 8 7 6 5 4 3 2 1

    // print out content:
    cout << "myvector contains:";
    for (it=myvector.begin(); it!=myvector.end(); ++it)
        cout << " " << *it;
    cout << endl;


     int myints[] = {1,2,3};

  cout << "The 3! possible permutations with 3 elements:\n";

  sort (myints,myints+3);
  reverse (myints,myints+3);

  do {
    cout << myints[0] << " " << myints[1] << " " << myints[2] << endl;
  } while ( prev_permutation (myints,myints+3) );

    /**-------------------------------------------------------------------------------------**/
//    int myints[] = {1,2,3,4,5,6,7,8,9};
    deque<int> mydeque;
    deque<int>::iterator iq;

    mydeque.resize(9);

    reverse_copy (myvector.begin(), myvector.end(), mydeque.begin());

    // print out content:
    cout << "mydeque  contains:";
    for (iq=mydeque.begin(); iq!=mydeque.end(); ++iq)
        cout << " " << *iq;
    cout << endl;



    return 0;
}