static class ComparableList extends ArrayList implements Comparable<ComparableList> {
  *() {}
  *(L l) { super(l); }
  
  public int compareTo(ComparableList l) {
    int n1 = l(this), n2 = l(l), n = min(n1, n2);
    for i to n: {
      int x = stdcompare(get(i), l.get(i));
      if (x != 0) ret x;
    }
    ret n1 > n2 ? 1 : n1 == n2 ? 0 : -1;
  }
}