import static java.lang.System.*;

public class SparseArrayTester
{
    public static void main(String[] args)
    {
        SparseArray sparse = new SparseArray();
        sparse.addEntry(new SparseArrayEntry(1,4,4));
        sparse.addEntry(new SparseArrayEntry(2,0,1));
        sparse.addEntry(new SparseArrayEntry(3,1,-9));
        sparse.addEntry(new SparseArrayEntry(1,1,5));

        out.println(sparse.getValueAt(3,1));
        out.println(sparse.getValueAt(3,3));

        out.println(sparse);
        sparse.removeColumn(1);
        out.println("removed column 1");
        out.println(sparse);
    }
}