206. Reverse Linked List_new.md #10
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oda
reviewed
Feb 9, 2025
| return reversed_head | ||
| ``` | ||
| これreversed_head=stack.pop()まではできていたので悔しい。 | ||
| araiさんはこの問題をstackに分類していたので、これが想定解なのかな。 |
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私はこれは linked list の繋ぎ変えだと思いますね。
https://docs.google.com/document/d/11HV35ADPo9QxJOpJQ24FcZvtvioli770WWdZZDaLOfg/edit?tab=t.0#heading=h.x5w37bodndgj
oda
reviewed
Feb 9, 2025
| current.next = None | ||
| return reversed_head | ||
| ``` | ||
| これreversed_head=stack.pop()まではできていたので悔しい。 |
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これ、stack の中で1つ目だけが特殊なのです。
なので、番兵を立てるか、分岐をするか、ループの外に出すかの選択になります。どれでもいいので発想できれば書けたでしょう。
あと、stack の中のノードがこの時点ではまだ .next で全部繋がっていることも意識しましょう。
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206. Reverse Linked List
Given the head of a singly linked list, reverse the list, and return the reversed list.
次は703. Kth Largest Element in a Stream