next_perm_example.cpp

利用递归查找数字的排列组合 使用了STL技术

//Examples of using next_permutation

#include<iostream>
#include<vector>
#include<string>
#include<algorithm>

using namespace std;


//using pointers
void display(char* c_str)
{
  cout<<c_str<<endl;
}

int main()
{
  char ca[]="1234";
  
  display(ca);
  for(int i=0;i<24-1;++i)
  {
    next_permutation(ca,ca+4);    
    display(ca);
  }


  return 0;
}


/*
//using iterators
void display(vector<char>::iterator begin,vector<char>::iterator end)
{
  for(vector<char>::iterator it= begin;it!=end;++it)
   cout<<*it;
  cout<<endl;
}

int main()
{
  //char ca[]="1234";
  vector<char> ca;
  ca.push_back('1');
  ca.push_back('2');
  ca.push_back('3');
  ca.push_back('4');
  
  display(ca.begin(),ca.end());
  for(int i=0;i<24-1;++i)
  {
    next_permutation(ca.begin(),ca.end());    
    display(ca.begin(),ca.end());
  }
  
  return 0;
}
*/

/*
//using arrays of string
void display(string* strstart, string* strend)
{
  for(string* it= strstart;it!=strend;++it)
   cout<<*it<<" ";
  cout<<endl;
}

int main()
{
  string* strarray=new string[3];
  strarray[0]="Red";
  strarray[1]="Green";
  strarray[2]="Blue";
  
  display(strarray,strarray+3);
  for(int i=0;i<6-1;++i)
  {
    next_permutation(strarray,strarray+3);    
    display(strarray,strarray+3);
  }

  delete [] strarray;  
  return 0;
}
*/