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fix README.md typo: 206. Reverse Linked List
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solutions/206. Reverse Linked List/README.md

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@@ -79,7 +79,7 @@ current_node = ?? # ❌ next 指向 prev 之後,舊的 next
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3️⃣ 如果有 3 個指標 (`prev_node`, `current_node`, `next_node`):
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```python
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next_node = next_node.next # 解決 2️⃣ 的問題,先把舊的節點存起來。
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next_node = current_node.next # 解決 2️⃣ 的問題,先把舊的節點存起來。
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current_node.next = prev_node # 反轉。
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prev_node = current_node # 移動 prev 到 current 的位置。
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current_node = next_node # 移動 current 到 next_node 的位置。

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