[Flynn] week4 #429
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[Flynn] week4 #429
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HC-kang
approved these changes
Sep 7, 2024
| * | ||
| * - Time complexity: O(M * N * 3 ^ W) | ||
| * - `exist`함수가 grid 원소 모두를 조회합니다 -> O(M * N) | ||
| * - 만약 `dfs`함수가 실행될 경우, 해당 함수는 최대 3방향에 대해 재귀호출을 실행합니다 (이전 좌표로는 `dfs`를 호출하지 않기 때문) |
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dfs가 종료조건에 의해 조기 종료 되더라도 호출 자체는 4방향으로 생각하는것이 맞지 않을까요?
특히 최초 요청의 경우에는 조기종료 없이 4방향으로 호출이 진행될텐데, 이부분을 3방향으로만 생각해도 될까 싶어서 의견드립니다!
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네 그럼 4 * 3^W 의 형태가 될텐데요, W의 크기가 증가함에 따라 3배씩 증가하니까 Big-O를 산정하는 관점에서는 O(3^W)로 보는 것이 맞다고 생각했습니다
이 부분은 저도 좀 더 준비해서 다음 시간에 발표해보겠습니다
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만약 4방향으로 호출하더라도 1방향은 이미 방문했던 방향이기에 유의미한 연산을 진행하지 않는다고 생각했습니다
그래서 Big-O를 따질 땐 빠져야 한다고 생각했어요
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