import java.security.InvalidParameterException;

 

 

 

public class Matrix
{
   private double[][] tb;
   private Matrix(double[][] tb) { this.tb=tb; }
   public Matrix(int rows,int cols) { tb=new double[rows][cols]; }
   public int rows() { return tb.length; }
   public int cols() { return tb.length>0?tb[0].length:0; }
  
   public static Matrix parseMatrix(String source)
   {
      String[] Rows = source.split("[\r\n]+");
      int rows=Rows.length;
      int cols=0;
      String[][] cells = new String[rows][];
      for(int r=0; r<rows; ++r) {
          cells[r] = Rows[r].split("[\t\\s]+");
          if(r == 0) cols = cells[r].length;
          else if(cols != cells[r].length) throw new InvalidParameterException("Nieregularna tablica.");
      }
      double[][] m = new double[rows][cols];
       for (int r = 0; r < rows; ++r) {
           for (int c = 0; c < cols; ++c) {
               m[r][c] = Double.parseDouble(cells[r][c]);
           }
       }
      return new Matrix(m);
   }
   @Override public String toString()
   {
      StringBuilder sb=new StringBuilder();
      int rows = this.rows();
      int cols = this.cols();
        for (int r = 0; r < rows; ++r) {
           for (int c = 0; c < cols; ++c) {
              if(c>0)
                sb.append('\t');
              sb.append(String.format("%.2f",tb[r][c]));
           }
           sb.append(System.lineSeparator());
       }
      return sb.toString();
   }
   public static Matrix multiply(Matrix a,Matrix b)
   {
      int rows=1;
      int cols=1;
      Matrix m=new Matrix(rows,cols);
     
      ///m.tb[r][c]
      return m;
   }
   public static Matrix gauss(Matrix a,Matrix b)
   {
      int rows=1;
      int cols=1;
      Matrix m=new Matrix(rows,cols);
     
      ///m.tb[r][c]
      return m;
   }