#pragma once

//DO NOT CHANGE THIS PART
typedef int TElem;
#define NULL_TELEM 0

class Matrix {

private:
	//TODO - Representation
	TElem* values;
	int* lines;
	int* columns;
	int numberOfLines;
	int numberOfColumns;

public:
	//constructor
	Matrix(int nrLines, int nrCols);

	//returns the number of lines
	int nrLines() const;

	//returns the number of columns
	int nrColumns() const;

	//returns the element from line i and column j (indexing starts from 0)
	//throws exception if (i,j) is not a valid position in the Matrix
	TElem element(int i, int j) const;

	//modifies the value from line i and column j
	//returns the previous value from the position
	//throws exception if (i,j) is not a valid position in the Matrix
	TElem modify(int i, int j, TElem e);

	void setMainDiagonal(TElem e);
	

};