<br />
<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_e5m765d8ktmcusrfbbrasusu7v, O_RDWR) failed: No space left on device (28) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
<br />
<b>Warning</b>:  session_start(): Failed to read session data: files (path: /var/lib/php/sessions) in <b>/var/www/tb-usercake/models/config.php</b> on line <b>51</b><br />
interface Matrix<A> {
  public int getWidth();
  public int getHeight();
  public A get(int x, int y);
  public void set(int x, int y, A a);
  
  default int nCells() { ret getWidth()*getHeight(); }
  
  default L<A> getLine(int y) {
    ret new RandomAccessAbstractList<A>() {
      public int size() { ret getWidth(); }
      
      public A get(int x) {
        ret Matrix.this.get(x, y);
      }
      
      public A set(int x, A val) {
        A old = Matrix.this.get(x, y);
        Matrix.this.set(x, y, val);
        ret old;
      }
    };
  }
}