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Combinatory.H

Go to the documentation of this file.

#ifndef _COMBINATORY_H
#define _COMBINATORY_H



namespace xchen
{
  inline unsigned long C(int i, int n)
  {
    assert(n>=i);
    
    if(i==n || !i) return 1;
    
    return C(i-1, n-1) + C(i, n-1);
  }
  

}//end namespace xchen


#endif

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