Given a string represented as a linked list, how would you efficiently check if it is a palindrome?

Question

Accepted Answer

To check if a string represented in a linked list is a palindrome, use two pointers to traverse the list and compare the values.

Use two pointers to traverse the linked list, one moving at a normal pace and the other moving twice as fast.
When the fast pointer reaches the end of the list, the slow pointer will be at the middle of the list.
Reverse the second half of the list and compare it with the first half to check if it's a palindrome.