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Combinations in C++

, 13 Sep 2009
An article on finding combinations.
//This recv_comb_ex.cpp tests the recursive combination function out
#include<iostream>
#include<vector>
#include<string>
#include"combination.h"

using namespace std;
using namespace stdcomb;


//test recursive_combination() with pointers

void display(char* begin,char* end)
{
  cout<<begin<<endl;
}
int main()
{
  char ca[]="123456";
  char cb[]="1234";
   
  recursive_combination(ca,ca+6,0,
                  cb,cb+4,0,6-4,display);
  cout<<"Complete!"<<endl;
	return 0;
}


/*
//test recursive_combination() with iterator
typedef vector<int>::iterator vii;

void display(vii begin,vii end)
{
  for (vii it=begin;it!=end;++it)
      cout<<*it;
  cout<<endl;
}

int main()
{
  vector<int> ca;
  ca.push_back (1);
  ca.push_back (2);
  ca.push_back (3);
  ca.push_back (4);
  ca.push_back (5);
  ca.push_back (6);
  vector<int> cb;
  cb.push_back (1);
  cb.push_back (2);
  cb.push_back (3);
  cb.push_back (4);
   
  recursive_combination(ca.begin (),ca.end(),0,
                  cb.begin(),cb.end(),0,6-4,display);
  cout<<"Complete!"<<endl;
	return 0;
}
*/

/*
//test recursive_combination() with array of strings

void display(string* begin,string* end)
{
  for (string* it=begin;it!=end;++it)
      cout<<*it<<" ";
  cout<<endl;
}


int main()
{
  string* strarray=new string[3];
  strarray[0]="Red";
  strarray[1]="Green";
  strarray[2]="Blue";
  string* strarray1=new string[2];
  strarray1[0]="Red";
  strarray1[1]="Green";
  
  recursive_combination(strarray,strarray+3,0,
                  strarray1,strarray1+2,0,3-2,display);
  cout<<"Complete!"<<endl;
  delete [] strarray;
  delete [] strarray1;

	return 0;
  
}
*/

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About the Author

Shao Voon Wong
Software Developer
Singapore Singapore

Currently into areas like 3D graphics and application security. Hoping to revisit the cryptography and design pattern topics if time permits.


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