???? ??? ????? ?? ?????? ?? heaps ?? ?????? ????? ???? ????? ??????? ??????? . ????? ????? ??? ???? ????? ????? ?? ?? ???? ???????? ?-???? ?? ????- ????. :???: ???? ?????? ?[: ???????. ?????:????? ????: ??????? ?????????? ????? ????* ?-?????[ ??????]. ????? ?????? :??????? ???????:??????? ??????? ??-\} ???? {????? ????? ????|?????