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