[shinsj4653] Week 14 Solutions#1634
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shinsj4653 merged 2 commits intoDaleStudy:mainfrom Jul 5, 2025
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#1608 안녕하세요~ pr승인이 필요해서 부탁드립니다! |
seungriyou
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Jul 5, 2025
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리뷰가 늦어져서 죄송합니다 😭 이번 주도 고생 많으셨어요~! 마지막 주까지 화이팅입니다 💪🏻
| def countBits(self, n: int) -> List[int]: | ||
| dp = [0] * (n + 1) | ||
| for num in range(1, n + 1): | ||
| dp[num] = dp[num // 2] + (num % 2) |
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가장 오른쪽 비트를 기준으로 하는 DP로 풀이하신 것 같네요!
저의 경우에는 // 2나 % 2 연산은 비트 연산으로 대체하는 편인데요, 비트 연산이 성능 측면에서 미세하게나마 더 효율적이라고 합니다! 따라서 dp[num] = dp[num >> 1] + (num & 1)로도 작성할 수 있을 것 같아요.
또한, 가장 왼쪽 비트를 기준으로 하는 DP로도 한 번 풀이해보시는 걸 추천드려요~!
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