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oda
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Jan 13, 2026
| ## Step1 Stack | ||
| - 所要時間: 10min. | ||
| - 方針: Stackに格納して最後に取り出す | ||
| - stackのカテゴリなので一応やってみる |
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同意です。一応実装しましたが、実装自体はstackだと非常に楽だと感じました。
逆にスタックを使うべき場面ってあまり直観的に想像がつかないですが、それこそ再帰だとスタックオーバーしそうなとき、とかかなと考えました。
| ## Step2 ポインタ操作 | ||
| - 所要時間: 20min. | ||
| - 方針: ポインタを用いていい感じにreverseする | ||
| - 計算量の観点でも実装のわかりやすさからもこっちが第一選択なように思う |
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確かに再帰で実装できます。なかなかその発想に至らないのはよくなかったです。
あとで試してみようと思います。
最奥まで探索して逆順に返すのは再帰の得意分野ですね🤔
dxxsxsxkx
reviewed
Jan 14, 2026
| public: | ||
| ListNode* reverseList(ListNode* head) { | ||
| ListNode *node = head; | ||
| ListNode *prev = nullptr; |
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最後に返すオブジェクトが prev なのはあまり直感的ではないと感じました。
c.f., https://docs.google.com/document/d/11HV35ADPo9QxJOpJQ24FcZvtvioli770WWdZZDaLOfg/edit?tab=t.0#heading=h.x5w37bodndgj
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そもそもnodeとprevという変数名がreverseする問題設定上わかりづらい設定だったかもしれません。
ご指摘ありがとうございます🙏
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206. Reverse Linked List