← 返回 apple 的题目列表Odd Even Linked List
类型：qbank
Given the head of a singly linked list, group all nodes at odd indices together followed by the nodes at even indices, and return the reordered list.
Examples
Example 1:
Input: head = [1,2,3,4,5]
Output: [1,3,5,2,4]
Example 2:
Input: head = [2,1,3,5,6,4,7]
Output: [2,3,6,7,1,5,4]
Constraints
0 <= number of nodes <= 10^4
-10^6 <= Node.val <= 10^6