May 2022
Beginner to intermediate
296 pages
5h 54m
Korean
Content preview from 똑똑한 코드 작성을 위한 실전 알고리즘
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135
4
장
힙
그림
4-11
우선순위가
16
인 엔트리를 추가해 꼭대기로 올린다
최악의 경우는 최대 이진 힙에 있는 모든 엔트리보다 우선순위가 높은 엔트리가 추가될 경우
다. 경로에서 엔트리 수는
1
+
floor
(
log
(
N
))이므로 교환 수행 횟수는 총 엔트리 개수보다
1
만큼 작은
floor
(
log
(
N
))이 된다. 이제
enqueue
()
이후에 최대 이진 힙을 재구성하는 시
간 복잡도가
O
(
log
N
)이 된다. 이 훌륭한 결과는 문제의 반만 다룬 것이다. 최대 이진 힙에서
가장 우선순위가 높은 엔트리를 효율적으로 제거할 수도 있어야 하기 때문이다.
4.3
우선순위가 가장 높은 값 제거하기
최대 이진 힙에서 우선순위가 가장 높은 엔트리를 찾기는 간단하다. 항상 레벨
0
의 맨 꼭대기
에 있는 단일 엔트리가 우선순위가 가장 높다. 하지만 레벨
0
에 엔트리가 없으면 힙 모양 속성
에 위반되므로 해당 엔트리를 단순히 제거할 수는 없다. 다행히도, 가장 꼭대기에 있는 엔트리
를 제거하고 효율적으로 최대 이진 힙을 재구성할 수 있는
dequeue
()
전략이 있다. 다음과 같
은 일련의 과정을 거친다.
1. 가장 밑바닥 레벨의 가장 우측에 있는 엔트리를 제거하고 저장한다. 그 시점에는 힙 순서와 힙 모양 속
성 모두를 만족할 것이다.
2. 레벨
0
에서 가장 우선순위가 높은 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.