mat

class Mat : public std::vector<double *>{
public:
    std::vector<int> dlugosci;
    Mat(){};
    ~Mat(){
    }
    double* addRow(int size){
        push_back(new double[size]);
        dlugosci.push_back(size);
        return back();
    }

    void deleteRow(int r){
        if (r<0 || r>=size() ) throw -1;

        else{
            int licznik=0;
            vector<double *>::iterator it;
            for (it=begin(); it!=end(); ++it){
                if (licznik==r){
                    delete[] at(r);
                    erase(it);
                    return;
                }
                licznik++;
            }
        }
    }

    double &operator()(int row, int col){
        if (row<0 || row>=size() || col<0 || col>=dlugosci[row]) throw -1;
        else return at(row)[col];
    }

    Mat operator+(Mat &other){
        Mat result;
        int rozmiar = max(dlugosci.size(),other.dlugosci.size());
        for (int i=0; i<rozmiar; ++i){
            int maxi = max(dlugosci[i],other.dlugosci[i]);
            result.addRow(maxi);
            for (int j=0; j<maxi; j++){
                if (j<dlugosci[i] && j<other.dlugosci[i]) result(i,j) = at(i)[j]+other.at(i)[j];
                else if (j>=dlugosci[i] && j<other.dlugosci[i]) result(i,j) = other.at(i)[j];
                else if (j<dlugosci[i] && j>=other.dlugosci[i]) result(i,j) = at(i)[j];

            }
        }
        return result;
    }
};