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