sclass CombinedList extends RandomAccessAbstractList {
int size;
new LL lists;
*() {}
void addList(L l) {
lists.add(l);
size += l(l);
}
public int size() { ret size; }
public A get(int index) {
int idx = 0;
for (L l : lists) {
int j = idx+l(l);
if (index < j)
ret l.get(index-idx);
idx = j;
}
throw new NoSuchElementException;
}
}