标签：algorithm   stl   算法   c++11   

next_permutation原型：

std::next_permutation

template <class BidirectionalIterator>
  bool next_permutation (BidirectionalIterator first,
                         BidirectionalIterator last);

template <class BidirectionalIterator, class Compare>
  bool next_permutation (BidirectionalIterator first,
                         BidirectionalIterator last, Compare comp);

如果成功则返回true,如果当前范围的序列已经是最大的了，则返回false.

一个简单的例子：

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
void nextpermutation(){
    vector<int> vi{1,3,2};
    cout<<"at first vi=";
    for(int i:vi)
        cout<<i<<" ";
    cout<<endl;
    cout<<"next_permutation(vi.begin(),vi.end())"<<endl;
    while(next_permutation(vi.begin(),vi.end())){
        for(int i:vi)
            cout<<i<<" ";
        cout<<endl;
    }
    cout<<"all greater permutation show on!"<<endl;


}

pre_permutation原型：

std::prev_permutation

template <class BidirectionalIterator>
  bool prev_permutation (BidirectionalIterator first,
                         BidirectionalIterator last );

template <class BidirectionalIterator, class Compare>
  bool prev_permutation (BidirectionalIterator first,
                         BidirectionalIterator last, Compare comp);

返回值也是true或者false,规则也是一样。

一个简单的例子：

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
void prevpermutation(){
    vector<int> vi{2,3,1};
    cout<<"at first vi=";
    for(int i:vi)
        cout<<i<<" ";
    cout<<endl;
    cout<<"pre_permutation(vi.begin(),vi.end())"<<endl;
    while(prev_permutation(vi.begin(),vi.end())){
        for(int i:vi)
            cout<<i<<" ";
        cout<<endl;
    }
    cout<<"all smaller permutation show on!"<<endl;


}

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//写的错误或者不好的地方请多多指导，可以在下面留言或者点击左上方邮件地址给我发邮件，指出我的错误以及不足，以便我修改，更好的分享给大家，谢谢。

转载请注明出处：http://blog.csdn.net/qq844352155

author:天下无双

Email:coderguang@gmail.com

2014-9-19

于GDUT

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STL algorithm算法next_permutation,prev_permutation(39)

标签：algorithm   stl   算法   c++11   

原文地址：http://blog.csdn.net/qq844352155/article/details/39394205