LeetCode 206. Reverse Linked List (反轉鏈表，迭代和遞歸2種解法)

Reverse a singly linked list. 反轉一個單鏈表。 Example:web Input: 1->2->3->4->5->NULL Output: 5->4->3->2->1->NULL Follow up:svg A linked list can be reversed either iteratively or recursively. Could you imple

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