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Palindrome Linked List

Given a linked list (as comma-separated values), return True if it is a palindrome.

Input:

1,2,2,1

Output:

True

Reasoning:

The input linked list is 1,2,2,1, which can be visualized as a sequence of nodes with values $1 \rightarrow 2 \rightarrow 2 \rightarrow 1$ .
To check if it's a palindrome, we compare the first and last nodes, then the second and second-to-last nodes, and so on.
Since the values are symmetric ( $1 = 1$ and $2 = 2$ ), the linked list is a palindrome.
The function returns True because the input linked list reads the same backward as forward.

Editor

Python 3.13.1

0/0

Run code to see test results.

📘

Given a linked list (as comma-separated values), return True if it is a palindrome.

Input:

1,2,2,1

Output:

True

Reasoning:

The input linked list is 1,2,2,1, which can be visualized as a sequence of nodes with values $1 \rightarrow 2 \rightarrow 2 \rightarrow 1$ .
To check if it's a palindrome, we compare the first and last nodes, then the second and second-to-last nodes, and so on.
Since the values are symmetric ( $1 = 1$ and $2 = 2$ ), the linked list is a palindrome.
The function returns True because the input linked list reads the same backward as forward.

Editor

Python 3.13.1

0/0

Run code to see test results.