Given the head
of a singly linked list, return true
if it is a palindrome.
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, 105]
. 0 <= Node.val <= 9
Follow up: Could you do it in
O(n)
time and O(1)
space?
[Stack] [Recursion] [Linked List] [Two Pointers]
- Palindrome Number (Easy)
- Valid Palindrome (Easy)
- Reverse Linked List (Easy)