110. Balanced Binary Tree#78
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kitano-kazuki wants to merge 1 commit into
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| ## アプローチ | ||
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| * highed-balancedかどうかを判定する |
| def isBalanced(self, root: Optional[TreeNode]) -> bool: | ||
| def is_balanced_helper(root: TreeNode | None) -> tuple[int, bool]: | ||
| if root is None: | ||
| return 1, True |
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これは再帰の起点なので1始まりでも結果的に影響は出ないのですが、heightとしては0が正しいのではないでしょうか？
（平衡の計算は相対的なずれだけなので、起点が常に1になっていても計算上のずれはなく、たとえば1を255とかにしても正しく動作します）
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https://leetcode.com/problems/balanced-binary-tree/description/