[croucs] WEEK 2 #714
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[croucs] WEEK 2 #714
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TonyKim9401
reviewed
Dec 20, 2024
TonyKim9401
reviewed
Dec 20, 2024
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| class Solution: | ||
| def buildTree(self, preorder: List[int], inorder: List[int]) -> Optional[TreeNode]: | ||
| if len(preorder) == 0: | ||
| return None | ||
| if len(preorder) == 1: | ||
| return TreeNode(preorder[0]) | ||
| root = TreeNode(preorder[0]) | ||
|
|
||
| split_idx = inorder.index(preorder[0]) | ||
| left_inorder = inorder[:split_idx] | ||
| right_inorder = inorder[split_idx+1:] | ||
| left_preorder = preorder[1:len(left_inorder)+1] | ||
| right_preorder = preorder[len(left_inorder)+1:] | ||
| root.left = self.buildTree(left_preorder, left_inorder) | ||
| root.right = self.buildTree(right_preorder, right_inorder) | ||
| return root |
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inorder과 preorder의 관계를 사용하여 dfs 풀이도 참조하시면 문제 이해에 더 도움이 되시지 않을까 싶습니다!
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인덱스만 가지고 할 수도 있었군요..! 참조해주셔서 감사합니다!
TonyKim9401
approved these changes
Dec 20, 2024
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