LeetCode — Odd Even Linked List

Input: head = [1,2,3,4,5]
Output: [1,3,5,2,4]
Input: head = [2,1,3,5,6,4,7]
Output: [2,3,6,7,1,5,4]
  • n == number of nodes in the linked list
  • 0 <= n <= 104
  • -106 <= Node.val <= 106

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