// Copyright 2008, 2009 Brady J. Garvin

// This file is part of Covering Arrays by Simulated Annealing (CASA).

// CASA is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.

// CASA is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.

// You should have received a copy of the GNU General Public License
// along with CASA.  If not, see <http://www.gnu.org/licenses/>.


#ifndef PASCAL_TRIANGLE_H
#define PASCAL_TRIANGLE_H

#include <vector>

#include "Array.H"

class PascalTriangle {
protected:
  // A table of n choose r, indexed by n then r.
  std::vector<Array<unsigned> >		table;
public:
  PascalTriangle();
  void addRows(unsigned targetDepth);
  unsigned nCr(unsigned n, unsigned r);
};

extern PascalTriangle triangle;

#endif