LeetCode — Reverse Linked List

Input: head = [1,2,3,4,5]
Output: [5,4,3,2,1]
Input: head = [1,2]
Output: [2,1]
Input: head = []
Output: []
  • The number of nodes in the list is the range [0, 5000].
  • -5000 <= Node.val <= 5000

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