May 2022
Beginner to intermediate
296 pages
5h 54m
Korean
Content preview from 똑똑한 코드 작성을 위한 실전 알고리즘
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267
7
장
그래프
그림
7-18
음수 간선 가중치로 인한 다익스트라 알고리즘의 실패
[그림
7
-
18
]에서 다익스트라 알고리즘은
impq
에
b
만 남을 때까지 노드
3
개를 처리한다. 마지
막 행에서 볼 수 있듯 다익스트라 알고리즘은
a
에서
d
로 가는 현재까지의 최단 경로를 계산했
다.
while
루프의 마지막 단계에서(그림에는 나오지 않는다) 다익스트라 알고리즘은
impq
에
서 노드
b
를 삭제하고 간선
(
b
,
d
)
를 완화한다. 불행히도 간선은 갑자기
d
에 대한 더 짧은 경
로를 밝힐 수도 있다. 하지만 다익스트라 알고리즘은 이미
impq
에서 노드
d
를 제거해 최단 경
로 계산을 마무리했다. ‘되돌아갈’ 수 없고 최단 경로를 조정할 수 없으므로 동작은 실패한다.
다익스트라 알고리즘은 간선 가중치가 음성이면 실패할 수 있다. 이는 새로운 간선으로 기존
경로를 확장하면 시작점과의 총 거리가 증가하거나 유지될 것이라고 가정했기 때문이다.
dist
_
to
에 있는 알고리즘 상태
dist
_
to
의 상태 업데이트다익스트라 알고리즘의 반복
#
impq
는
[
a
,
b
,
c
,
d
]
를 포함한다.
#
impq
는
[
c
,
b
,
d
]
를 포함한다.
#
impq
는
[
d
,
b
]
를 포함한다.
268
똑똑한 코드 작성을 위한 실전 알고리즘
벨먼-포드
Bellman
-
Ford
알고리즘은 그래프에
src
에서 다른
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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.