185. Palindrome Linked List

EasyLinked List

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

Examples

Input: [1,2,2,1]

Output: true

Explanation: Reads the same forward and backward.

Constraints

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

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