[printjin-gmailcom] WEEK 02 Solutions #1219
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jinhyungrhee
approved these changes
Apr 12, 2025
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| class Solution: | ||
| def isAnagram(self, s: str, t: str): | ||
| return Counter(s) == Counter(t) |
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python에서 제공하는 Counter 자료구조를 사용하면 코드가 정말 간단해지네요!
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| class Solution: | ||
| def isValidBST(self, root): | ||
| max_val = float("-inf") | ||
| def dfs(node): | ||
| if not node: | ||
| return True | ||
| nonlocal max_val | ||
| if not dfs(node.left): | ||
| return False | ||
| if max_val >= node.val: | ||
| return False | ||
| max_val = node.val | ||
| if not dfs(node.right): | ||
| return False | ||
| return True | ||
| return dfs(root) |
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저는 트리 탐색의 결과를 List 로 저장을 하여 최종적으로 오름차순 검증을 하였는데,
이 풀이 방법처럼 탐색 과정에서 max_val을 업데이트하면서 노드 값과 비교(= 오름차순 검증)를 할 수도 있군요!
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