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// Copyright (C) 2005, Ondra Kamenik
// $Id: pascal_triangle.h 762 2006-05-22 13:00:07Z kamenik $
#ifndef PASCAL_TRIANGLE_H
#define PASCAL_TRIANGLE_H
#include <vector>
namespace ogu {
using std::vector;
class PascalRow : public vector<int> {
int k;
public:
PascalRow()
: vector<int>(), k(1)
{ push_back(2); }
void setFromPrevious(const PascalRow& prev);
void prolong(const PascalRow& prev);
void prolongFirst(int n);
void print() const;
};
class PascalTriangle {
vector<PascalRow> tr;
public:
PascalTriangle()
{tr.push_back(PascalRow());}
PascalTriangle(const PascalTriangle& triang)
: tr(triang.tr) {}
const PascalTriangle& operator=(const PascalTriangle& triang)
{ tr = triang.tr; return *this;}
int noverk(int n, int k);
void print() const;
protected:
void ensure(int n, int k);
int max_n() const;
int max_k() const;
};
};
extern ogu::PascalTriangle ptriang;
#endif
// Local Variables:
// mode:C++
// End:
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