234. Palindrome Linked List

Given the head of a singly linked list, return true if it is a palindrome or false otherwise.

Example 1:

Input: head = [1,2,2,1]
Output: true

Example 2:

Input: head = [1,2]
Output: false

Constraints:
The number of nodes in the list is in the range [1, 10**5].
0 <= Node.val <= 9

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