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<b>Warning</b>:  session_start(): open(/var/lib/php/sessions/sess_02pch1urs9dusl2teu2kre7ha6, 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 />
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<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 />
static <A> L<A> matrixToList(Matrix<A> m) {
  if (m == null) null;
  int w = m.getWidth(), h = m.getHeight(), n = w*h;
  
  ret new RandomAccessAbstractList<A>() {
    public int size() { ret n; }
    
    public A get(int i) {
      ret m.get(i % w, i / w);
    }
    
    public A set(int i, A val) {
      A old = m.get(i % w, i % h);
      m.set(i % w, i / w, val);
      ret old;
    }
  };
}