103. Binary Tree Zigzag Level Order Traversal#26
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Apr 20, 2026
| class Solution { | ||
| public: | ||
| vector<vector<int>> zigzagLevelOrder(TreeNode* root) { | ||
| vector<vector<int>> result; |
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result が空であることを利用している点が、ややパズルに感じました。 initializer list を使って以下のように書いたほうがシンプルだと感じました。
if (!root) return {};
vector<vector<int>> result;
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ありがとうございます。initializer listを使った書き方は知りませんでした。
| public: | ||
| vector<vector<int>> zigzagLevelOrder(TreeNode* root) { | ||
| vector<vector<int>> result; | ||
| if (!root) return result; |
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こちらのコメントをご参照ください。
Shunii85/arai60#17 (comment)
| queue<TreeNode*> nodes; | ||
| nodes.push(root); | ||
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| bool toggle = false; |
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toggle という変数名に、あまり情報がないように感じました。 right_to_left などはいかがでしょうか？
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そうですね、right_to_leftの方がtrue, falseの意味も分かりやすくていい気がします。
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この問題：https://leetcode.com/problems/binary-tree-zigzag-level-order-traversal/description/
次に解く問題：https://leetcode.com/problems/validate-binary-search-tree/description/