[Chaedie] Week 3 #767
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[Chaedie] Week 3 #767
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@Chaedie 님 안녕하세요 한 문제를 풀더라도 여러 번 푸시고, 문제 복기도 꼼꼼히 하신 걸 보고 이번주 소홀히 했던 걸 반성했습니다...ㅠㅠ 천천히 리뷰하도록 하겠습니다! |
KwonNayeon
approved these changes
Dec 27, 2024
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| # 스스로 풀기 | ||
| # 한번 더 풀 에정입니다. | ||
| def reverseBits(self, n: int) -> int: | ||
| result = 0 | ||
| for i in range(32): | ||
| result = result << 1 | ||
| result = result | (n & 1) | ||
| n = n >> 1 | ||
| return result |
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저는 string manipulation을 이용해서 문제를 풀었는데, 비트 연산을 이용한 다양한 풀이방법을 배울 수 있었습니다!
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감사합니다..! 문제의 취지가 "비트 연산 사용해보기"인것 같아서 비트 위주로 풀어보았습니다..!
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| class Solution: | ||
| def twoSum(self, nums: List[int], target: int) -> List[int]: | ||
| num_map = {} # num : index | ||
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| for i, val in enumerate(nums): | ||
| diff = target - val | ||
| if diff in num_map: | ||
| return [num_map[diff], i] | ||
| num_map[val] = i |
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저는 이중 반복문으로 문제를 풀어서 시간 복잡도가 O(n²)�였는데, 해시맵을 사용하면 시간 복잡도를 줄일 수 있다는 걸 알게 되었습니다!
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브루트 포스 -> sort -> hash map 등등 다양한 풀이가 있더라구요. 감사합니다.
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